diff --git a/apps/web/package.json b/apps/web/package.json
index 55dad1d..318a881 100644
--- a/apps/web/package.json
+++ b/apps/web/package.json
@@ -36,7 +36,6 @@
     "@trpc/server": "^11.1.1",
     "@unsend/email-editor": "workspace:*",
     "@unsend/ui": "workspace:*",
-    "jsx-email": "^2.7.1",
     "bullmq": "^5.51.1",
     "chrono-node": "^2.8.0",
     "date-fns": "^4.1.0",
@@ -45,6 +44,7 @@
     "hono": "^4.7.7",
     "html-to-text": "^9.0.5",
     "ioredis": "^5.6.1",
+    "jsx-email": "^2.7.1",
     "lucide-react": "^0.503.0",
     "mime-types": "^3.0.1",
     "nanoid": "^5.1.5",
@@ -67,7 +67,8 @@
     "ua-parser-js": "^2.0.3",
     "unsend": "workspace:*",
     "use-debounce": "^10.0.4",
-    "zod": "^3.24.3"
+    "zod": "^3.24.3",
+    "zustand": "^5.0.8"
   },
   "devDependencies": {
     "@next/eslint-plugin-next": "^15.3.1",
diff --git a/apps/web/prisma/migrations/20250824131647_add_price_ids_array/migration.sql b/apps/web/prisma/migrations/20250824131647_add_price_ids_array/migration.sql
new file mode 100644
index 0000000..f136c1c
--- /dev/null
+++ b/apps/web/prisma/migrations/20250824131647_add_price_ids_array/migration.sql
@@ -0,0 +1,8 @@
+-- CreateEnum
+CREATE TYPE "SendingDisabledReason" AS ENUM ('FREE_LIMIT_REACHED', 'BILLING_ISSUE', 'SPAM');
+
+-- AlterTable
+ALTER TABLE "Subscription" ADD COLUMN     "priceIds" TEXT[];
+
+-- Populate priceIds array with existing priceId values
+UPDATE "Subscription" SET "priceIds" = ARRAY["priceId"] WHERE "priceId" IS NOT NULL;
diff --git a/apps/web/prisma/schema.prisma b/apps/web/prisma/schema.prisma
index ffa2f4e..8d380de 100644
--- a/apps/web/prisma/schema.prisma
+++ b/apps/web/prisma/schema.prisma
@@ -138,6 +138,7 @@ model Subscription {
   teamId             Int
   status             String
   priceId            String
+  priceIds           String[]
   currentPeriodEnd   DateTime?
   currentPeriodStart DateTime?
   cancelAtPeriodEnd  DateTime?
diff --git a/apps/web/src/app/(dashboard)/contacts/add-contact-book.tsx b/apps/web/src/app/(dashboard)/contacts/add-contact-book.tsx
index 7c005ee..e9ccdfd 100644
--- a/apps/web/src/app/(dashboard)/contacts/add-contact-book.tsx
+++ b/apps/web/src/app/(dashboard)/contacts/add-contact-book.tsx
@@ -26,6 +26,8 @@ import {
   FormLabel,
   FormMessage,
 } from "@unsend/ui/src/form";
+import { useUpgradeModalStore } from "~/store/upgradeModalStore";
+import { LimitReason } from "~/lib/constants/plans";
 
 const contactBookSchema = z.object({
   name: z.string({ required_error: "Name is required" }).min(1, {
@@ -38,6 +40,11 @@ export default function AddContactBook() {
   const createContactBookMutation =
     api.contacts.createContactBook.useMutation();
 
+  const limitsQuery = api.limits.get.useQuery({
+    type: LimitReason.CONTACT_BOOK,
+  });
+  const { openModal } = useUpgradeModalStore((s) => s.action);
+
   const utils = api.useUtils();
 
   const contactBookForm = useForm<z.infer<typeof contactBookSchema>>({
@@ -48,6 +55,11 @@ export default function AddContactBook() {
   });
 
   function handleSave(values: z.infer<typeof contactBookSchema>) {
+    if (limitsQuery.data?.isLimitReached) {
+      openModal(limitsQuery.data.reason);
+      return;
+    }
+
     createContactBookMutation.mutate(
       {
         name: values.name,
@@ -59,14 +71,23 @@ export default function AddContactBook() {
           setOpen(false);
           toast.success("Contact book created successfully");
         },
-      }
+      },
     );
   }
 
+  function onOpenChange(_open: boolean) {
+    if (_open && limitsQuery.data?.isLimitReached) {
+      openModal(limitsQuery.data.reason);
+      return;
+    }
+
+    setOpen(_open);
+  }
+
   return (
     <Dialog
       open={open}
-      onOpenChange={(_open) => (_open !== open ? setOpen(_open) : null)}
+      onOpenChange={(_open) => (_open !== open ? onOpenChange(_open) : null)}
     >
       <DialogTrigger asChild>
         <Button>
@@ -108,7 +129,9 @@ export default function AddContactBook() {
                 <Button
                   className=" w-[100px]"
                   type="submit"
-                  disabled={createContactBookMutation.isPending}
+                  disabled={
+                    createContactBookMutation.isPending || limitsQuery.isLoading
+                  }
                 >
                   {createContactBookMutation.isPending
                     ? "Creating..."
diff --git a/apps/web/src/app/(dashboard)/dasboard-layout.tsx b/apps/web/src/app/(dashboard)/dasboard-layout.tsx
index e894a37..c5f5be8 100644
--- a/apps/web/src/app/(dashboard)/dasboard-layout.tsx
+++ b/apps/web/src/app/(dashboard)/dasboard-layout.tsx
@@ -4,6 +4,7 @@ import { AppSidebar } from "~/components/AppSideBar";
 import { SidebarInset, SidebarTrigger } from "@unsend/ui/src/sidebar";
 import { SidebarProvider } from "@unsend/ui/src/sidebar";
 import { useIsMobile } from "@unsend/ui/src/hooks/use-mobile";
+import { UpgradeModal } from "~/components/payments/UpgradeModal";
 
 export function DashboardLayout({ children }: { children: React.ReactNode }) {
   const isMobile = useIsMobile();
@@ -21,6 +22,7 @@ export function DashboardLayout({ children }: { children: React.ReactNode }) {
           </main>
         </SidebarInset>
       </SidebarProvider>
+      <UpgradeModal />
     </div>
   );
 }
diff --git a/apps/web/src/app/(dashboard)/domains/add-domain.tsx b/apps/web/src/app/(dashboard)/domains/add-domain.tsx
index a85695c..4956699 100644
--- a/apps/web/src/app/(dashboard)/domains/add-domain.tsx
+++ b/apps/web/src/app/(dashboard)/domains/add-domain.tsx
@@ -35,6 +35,8 @@ import {
   SelectValue,
 } from "@unsend/ui/src/select";
 import { toast } from "@unsend/ui/src/toaster";
+import { useUpgradeModalStore } from "~/store/upgradeModalStore";
+import { LimitReason } from "~/lib/constants/plans";
 
 const domainSchema = z.object({
   region: z.string({ required_error: "Region is required" }).min(1, {
@@ -49,6 +51,9 @@ export default function AddDomain() {
   const [open, setOpen] = useState(false);
 
   const regionQuery = api.domain.getAvailableRegions.useQuery();
+  const limitsQuery = api.limits.get.useQuery({ type: LimitReason.DOMAIN });
+
+  const { openModal } = useUpgradeModalStore((s) => s.action);
 
   const addDomainMutation = api.domain.createDomain.useMutation();
 
@@ -73,6 +78,11 @@ export default function AddDomain() {
       return;
     }
 
+    if (limitsQuery.data?.isLimitReached) {
+      openModal(limitsQuery.data.reason);
+      return;
+    }
+
     addDomainMutation.mutate(
       {
         name: values.domain,
@@ -91,10 +101,19 @@ export default function AddDomain() {
     );
   }
 
+  function onOpenChange(_open: boolean) {
+    if (_open && limitsQuery.data?.isLimitReached) {
+      openModal(limitsQuery.data.reason);
+      return;
+    }
+
+    setOpen(_open);
+  }
+
   return (
     <Dialog
       open={open}
-      onOpenChange={(_open) => (_open !== open ? setOpen(_open) : null)}
+      onOpenChange={(_open) => (_open !== open ? onOpenChange(_open) : null)}
     >
       <DialogTrigger asChild>
         <Button>
@@ -171,7 +190,9 @@ export default function AddDomain() {
                 <Button
                   className=" w-[100px]"
                   type="submit"
-                  disabled={addDomainMutation.isPending}
+                  disabled={
+                    addDomainMutation.isPending || limitsQuery.isLoading
+                  }
                 >
                   {addDomainMutation.isPending ? "Adding..." : "Add"}
                 </Button>
diff --git a/apps/web/src/app/(dashboard)/settings/team/invite-team-member.tsx b/apps/web/src/app/(dashboard)/settings/team/invite-team-member.tsx
index 24f6fb1..62cbb06 100644
--- a/apps/web/src/app/(dashboard)/settings/team/invite-team-member.tsx
+++ b/apps/web/src/app/(dashboard)/settings/team/invite-team-member.tsx
@@ -34,6 +34,8 @@ import {
 } from "@unsend/ui/src/form";
 import { useTeam } from "~/providers/team-context";
 import { isCloud, isSelfHosted } from "~/utils/common";
+import { useUpgradeModalStore } from "~/store/upgradeModalStore";
+import { LimitReason } from "~/lib/constants/plans";
 
 const inviteTeamMemberSchema = z.object({
   email: z
@@ -50,6 +52,11 @@ export default function InviteTeamMember() {
   const { currentIsAdmin } = useTeam();
   const { data: domains } = api.domain.domains.useQuery();
 
+  const limitsQuery = api.limits.get.useQuery({
+    type: LimitReason.TEAM_MEMBER,
+  });
+  const { openModal } = useUpgradeModalStore((s) => s.action);
+
   const [open, setOpen] = useState(false);
 
   const form = useForm<FormData>({
@@ -65,6 +72,11 @@ export default function InviteTeamMember() {
   const createInvite = api.team.createTeamInvite.useMutation();
 
   function onSubmit(values: FormData) {
+    if (limitsQuery.data?.isLimitReached) {
+      openModal(limitsQuery.data.reason);
+      return;
+    }
+
     createInvite.mutate(
       {
         email: values.email,
@@ -82,11 +94,16 @@ export default function InviteTeamMember() {
           console.error(error);
           toast.error(error.message || "Failed to send invitation");
         },
-      }
+      },
     );
   }
 
   async function onCopyLink() {
+    if (limitsQuery.data?.isLimitReached) {
+      openModal(limitsQuery.data.reason);
+      return;
+    }
+
     createInvite.mutate(
       {
         email: form.getValues("email"),
@@ -97,7 +114,7 @@ export default function InviteTeamMember() {
         onSuccess: (invite) => {
           void utils.team.getTeamInvites.invalidate();
           navigator.clipboard.writeText(
-            `${location.origin}/join-team?inviteId=${invite.id}`
+            `${location.origin}/join-team?inviteId=${invite.id}`,
           );
           form.reset();
           setOpen(false);
@@ -107,16 +124,28 @@ export default function InviteTeamMember() {
           console.error(error);
           toast.error(error.message || "Failed to copy invitation link");
         },
-      }
+      },
     );
   }
 
+  function onOpenChange(_open: boolean) {
+    if (_open && limitsQuery.data?.isLimitReached) {
+      openModal(limitsQuery.data.reason);
+      return;
+    }
+
+    setOpen(_open);
+  }
+
   if (!currentIsAdmin) {
     return null;
   }
 
   return (
-    <Dialog open={open} onOpenChange={setOpen}>
+    <Dialog
+      open={open}
+      onOpenChange={(_open) => (_open !== open ? onOpenChange(_open) : null)}
+    >
       <DialogTrigger asChild>
         <Button size="sm">
           <PlusIcon className="mr-2 h-4 w-4" />
@@ -201,7 +230,7 @@ export default function InviteTeamMember() {
               </Button>
               {isSelfHosted() ? (
                 <Button
-                  disabled={createInvite.isPending}
+                  disabled={createInvite.isPending || limitsQuery.isLoading}
                   isLoading={createInvite.isPending}
                   className="w-[150px]"
                   onClick={form.handleSubmit(onCopyLink)}
@@ -212,7 +241,7 @@ export default function InviteTeamMember() {
               {isCloud() || domains?.length ? (
                 <Button
                   type="submit"
-                  disabled={createInvite.isPending}
+                  disabled={createInvite.isPending || limitsQuery.isLoading}
                   isLoading={createInvite.isPending}
                   className="w-[150px]"
                 >
diff --git a/apps/web/src/components/payments/PlanDetails.tsx b/apps/web/src/components/payments/PlanDetails.tsx
index 3bf58a7..b3b0de6 100644
--- a/apps/web/src/components/payments/PlanDetails.tsx
+++ b/apps/web/src/components/payments/PlanDetails.tsx
@@ -6,6 +6,7 @@ import Spinner from "@unsend/ui/src/spinner";
 import { useTeam } from "~/providers/team-context";
 import { Badge } from "@unsend/ui/src/badge";
 import { format } from "date-fns";
+
 export const PlanDetails = () => {
   const subscriptionQuery = api.billing.getSubscriptionDetails.useQuery();
   const { currentTeam } = useTeam();
diff --git a/apps/web/src/components/payments/UpgradeModal.tsx b/apps/web/src/components/payments/UpgradeModal.tsx
new file mode 100644
index 0000000..8c70097
--- /dev/null
+++ b/apps/web/src/components/payments/UpgradeModal.tsx
@@ -0,0 +1,67 @@
+"use client";
+
+import {
+  Dialog,
+  DialogContent,
+  DialogHeader,
+  DialogTitle,
+  DialogDescription,
+} from "@unsend/ui/src/dialog";
+import { CheckCircle2 } from "lucide-react";
+import { useUpgradeModalStore } from "~/store/upgradeModalStore";
+import { PLAN_PERKS } from "~/lib/constants/payments";
+import { LimitReason } from "~/lib/constants/plans";
+import { UpgradeButton } from "./UpgradeButton";
+
+export const UpgradeModal = () => {
+  const {
+    isOpen,
+    reason,
+    action: { closeModal },
+  } = useUpgradeModalStore();
+
+  const basicPlanPerks = PLAN_PERKS.BASIC || [];
+
+  return (
+    <Dialog open={isOpen} onOpenChange={(open) => !open && closeModal()}>
+      <DialogContent className="max-w-md">
+        <DialogHeader>
+          <DialogTitle>Upgrade to Basic Plan</DialogTitle>
+          <DialogDescription>
+            {(() => {
+              const messages: Record<LimitReason, string> = {
+                [LimitReason.DOMAIN]:
+                  "You've reached the domain limit for your current plan.",
+                [LimitReason.CONTACT_BOOK]:
+                  "You've reached the contact book limit for your current plan.",
+                [LimitReason.TEAM_MEMBER]:
+                  "You've reached the team member limit for your current plan.",
+                [LimitReason.EMAIL]:
+                  "You've reached the email sending limit for your current plan.",
+              };
+              return reason
+                ? `${messages[reason] ?? ""} Upgrade to unlock this feature and more.`
+                : "Unlock more features with our Basic plan.";
+            })()}
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="space-y-4">
+          <div>
+            <h4 className="font-medium mb-3">What you'll get:</h4>
+            <ul className="space-y-2">
+              {basicPlanPerks.map((perk, index) => (
+                <li key={index} className="flex items-start gap-2">
+                  <CheckCircle2 className="h-4 w-4 text-green-500 flex-shrink-0 mt-0.5" />
+                  <span className="text-sm">{perk}</span>
+                </li>
+              ))}
+            </ul>
+          </div>
+
+          <UpgradeButton />
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+};
diff --git a/apps/web/src/env.js b/apps/web/src/env.js
index babe1fd..0ca8b69 100644
--- a/apps/web/src/env.js
+++ b/apps/web/src/env.js
@@ -53,6 +53,8 @@ export const env = createEnv({
     S3_COMPATIBLE_PUBLIC_URL: z.string().optional(),
     STRIPE_SECRET_KEY: z.string().optional(),
     STRIPE_BASIC_PRICE_ID: z.string().optional(),
+    STRIPE_BASIC_USAGE_PRICE_ID: z.string().optional(),
+    STRIPE_LEGACY_BASIC_PRICE_ID: z.string().optional(),
     STRIPE_WEBHOOK_SECRET: z.string().optional(),
     SMTP_HOST: z.string().default("smtp.unsend.dev"),
     SMTP_USER: z.string().default("unsend"),
@@ -102,6 +104,8 @@ export const env = createEnv({
     S3_COMPATIBLE_PUBLIC_URL: process.env.S3_COMPATIBLE_PUBLIC_URL,
     STRIPE_SECRET_KEY: process.env.STRIPE_SECRET_KEY,
     STRIPE_BASIC_PRICE_ID: process.env.STRIPE_BASIC_PRICE_ID,
+    STRIPE_BASIC_USAGE_PRICE_ID: process.env.STRIPE_BASIC_USAGE_PRICE_ID,
+    STRIPE_LEGACY_BASIC_PRICE_ID: process.env.STRIPE_LEGACY_BASIC_PRICE_ID,
     STRIPE_WEBHOOK_SECRET: process.env.STRIPE_WEBHOOK_SECRET,
     SMTP_HOST: process.env.SMTP_HOST,
     SMTP_USER: process.env.SMTP_USER,
diff --git a/apps/web/src/lib/constants/plans.ts b/apps/web/src/lib/constants/plans.ts
new file mode 100644
index 0000000..cc3378c
--- /dev/null
+++ b/apps/web/src/lib/constants/plans.ts
@@ -0,0 +1,34 @@
+import { Plan } from "@prisma/client";
+
+export enum LimitReason {
+  DOMAIN = "DOMAIN",
+  CONTACT_BOOK = "CONTACT_BOOK",
+  TEAM_MEMBER = "TEAM_MEMBER",
+  EMAIL = "EMAIL",
+}
+
+export const PLAN_LIMITS: Record<
+  Plan,
+  {
+    emailsPerMonth: number;
+    emailsPerDay: number;
+    domains: number;
+    contactBooks: number;
+    teamMembers: number;
+  }
+> = {
+  FREE: {
+    emailsPerMonth: 3000,
+    emailsPerDay: 100,
+    domains: 1,
+    contactBooks: 1,
+    teamMembers: 1,
+  },
+  BASIC: {
+    emailsPerMonth: -1, // unlimited
+    emailsPerDay: -1, // unlimited
+    domains: -1,
+    contactBooks: -1,
+    teamMembers: -1,
+  },
+};
diff --git a/apps/web/src/lib/usage.ts b/apps/web/src/lib/usage.ts
index 23e8d04..c93f86e 100644
--- a/apps/web/src/lib/usage.ts
+++ b/apps/web/src/lib/usage.ts
@@ -1,4 +1,4 @@
-import { EmailUsageType, Plan } from "@prisma/client";
+import { EmailUsageType, Plan, Subscription } from "@prisma/client";
 
 export const USAGE_UNIT_PRICE: Record<EmailUsageType, number> = {
   [EmailUsageType.MARKETING]: 0.001,
diff --git a/apps/web/src/server/api/root.ts b/apps/web/src/server/api/root.ts
index b45e47a..155011f 100644
--- a/apps/web/src/server/api/root.ts
+++ b/apps/web/src/server/api/root.ts
@@ -11,6 +11,7 @@ import { billingRouter } from "./routers/billing";
 import { invitationRouter } from "./routers/invitiation";
 import { dashboardRouter } from "./routers/dashboard";
 import { suppressionRouter } from "./routers/suppression";
+import { limitsRouter } from "./routers/limits";
 
 /**
  * This is the primary router for your server.
@@ -30,6 +31,7 @@ export const appRouter = createTRPCRouter({
   invitation: invitationRouter,
   dashboard: dashboardRouter,
   suppression: suppressionRouter,
+  limits: limitsRouter,
 });
 
 // export type definition of API
diff --git a/apps/web/src/server/api/routers/billing.ts b/apps/web/src/server/api/routers/billing.ts
index 2c56208..eee9691 100644
--- a/apps/web/src/server/api/routers/billing.ts
+++ b/apps/web/src/server/api/routers/billing.ts
@@ -2,6 +2,7 @@ import { DailyEmailUsage, EmailUsageType, Subscription } from "@prisma/client";
 import { TRPCError } from "@trpc/server";
 import { format, sub } from "date-fns";
 import { z } from "zod";
+import { getThisMonthUsage } from "~/server/service/usage-service";
 
 import {
   apiKeyProcedure,
@@ -25,48 +26,7 @@ export const billingRouter = createTRPCRouter({
   }),
 
   getThisMonthUsage: teamProcedure.query(async ({ ctx }) => {
-    const isPaidPlan = ctx.team.plan !== "FREE";
-    let subscription: Subscription | null = null;
-
-    if (isPaidPlan) {
-      subscription = await db.subscription.findFirst({
-        where: { teamId: ctx.team.id },
-        orderBy: { status: "asc" },
-      });
-    }
-
-    const isoStartDate = subscription?.currentPeriodStart
-      ? format(subscription.currentPeriodStart, "yyyy-MM-dd")
-      : format(new Date(), "yyyy-MM-01"); // First day of current month
-    const today = format(new Date(), "yyyy-MM-dd");
-
-    const [monthUsage, dayUsage] = await Promise.all([
-      // Get month usage
-      db.$queryRaw<Array<{ type: EmailUsageType; sent: number }>>`
-        SELECT 
-          type,
-          SUM(sent)::integer AS sent
-        FROM "DailyEmailUsage"
-        WHERE "teamId" = ${ctx.team.id}
-        AND "date" >= ${isoStartDate}
-        GROUP BY "type"
-      `,
-      // Get today's usage
-      db.$queryRaw<Array<{ type: EmailUsageType; sent: number }>>`
-        SELECT 
-          type,
-          SUM(sent)::integer AS sent
-        FROM "DailyEmailUsage"
-        WHERE "teamId" = ${ctx.team.id}
-        AND "date" = ${today}
-        GROUP BY "type"
-      `,
-    ]);
-
-    return {
-      month: monthUsage,
-      day: dayUsage,
-    };
+    return await getThisMonthUsage(ctx.team.id);
   }),
 
   getSubscriptionDetails: teamProcedure.query(async ({ ctx }) => {
diff --git a/apps/web/src/server/api/routers/contacts.ts b/apps/web/src/server/api/routers/contacts.ts
index 9c20ca3..bfe1dc5 100644
--- a/apps/web/src/server/api/routers/contacts.ts
+++ b/apps/web/src/server/api/routers/contacts.ts
@@ -7,24 +7,13 @@ import {
   teamProcedure,
 } from "~/server/api/trpc";
 import * as contactService from "~/server/service/contact-service";
+import * as contactBookService from "~/server/service/contact-book-service";
 
 export const contactsRouter = createTRPCRouter({
   getContactBooks: teamProcedure
     .input(z.object({ search: z.string().optional() }))
-    .query(async ({ ctx: { db, team }, input }) => {
-      return db.contactBook.findMany({
-        where: {
-          teamId: team.id,
-          ...(input.search
-            ? { name: { contains: input.search, mode: "insensitive" } }
-            : {}),
-        },
-        include: {
-          _count: {
-            select: { contacts: true },
-          },
-        },
-      });
+    .query(async ({ ctx: { team }, input }) => {
+      return contactBookService.getContactBooks(team.id, input.search);
     }),
 
   createContactBook: teamProcedure
@@ -33,40 +22,15 @@ export const contactsRouter = createTRPCRouter({
         name: z.string(),
       })
     )
-    .mutation(async ({ ctx: { db, team }, input }) => {
+    .mutation(async ({ ctx: { team }, input }) => {
       const { name } = input;
-      const contactBook = await db.contactBook.create({
-        data: {
-          name,
-          teamId: team.id,
-          properties: {},
-        },
-      });
-
-      return contactBook;
+      return contactBookService.createContactBook(team.id, name);
     }),
 
   getContactBookDetails: contactBookProcedure.query(
-    async ({ ctx: { contactBook, db } }) => {
-      const [totalContacts, unsubscribedContacts, campaigns] =
-        await Promise.all([
-          db.contact.count({
-            where: { contactBookId: contactBook.id },
-          }),
-          db.contact.count({
-            where: { contactBookId: contactBook.id, subscribed: false },
-          }),
-          db.campaign.findMany({
-            where: {
-              contactBookId: contactBook.id,
-              status: CampaignStatus.SENT,
-            },
-            orderBy: {
-              createdAt: "desc",
-            },
-            take: 2,
-          }),
-        ]);
+    async ({ ctx: { contactBook } }) => {
+      const { totalContacts, unsubscribedContacts, campaigns } =
+        await contactBookService.getContactBookDetails(contactBook.id);
 
       return {
         ...contactBook,
@@ -86,18 +50,14 @@ export const contactsRouter = createTRPCRouter({
         emoji: z.string().optional(),
       })
     )
-    .mutation(async ({ ctx: { db }, input }) => {
-      const { contactBookId, ...data } = input;
-      return db.contactBook.update({
-        where: { id: contactBookId },
-        data,
-      });
+    .mutation(async ({ ctx: { contactBook }, input }) => {
+      return contactBookService.updateContactBook(contactBook.id, input);
     }),
 
   deleteContactBook: contactBookProcedure
     .input(z.object({ contactBookId: z.string() }))
-    .mutation(async ({ ctx: { db }, input }) => {
-      return db.contactBook.delete({ where: { id: input.contactBookId } });
+    .mutation(async ({ ctx: { contactBook }, input }) => {
+      return contactBookService.deleteContactBook(contactBook.id);
     }),
 
   contacts: contactBookProcedure
diff --git a/apps/web/src/server/api/routers/limits.ts b/apps/web/src/server/api/routers/limits.ts
new file mode 100644
index 0000000..0425d55
--- /dev/null
+++ b/apps/web/src/server/api/routers/limits.ts
@@ -0,0 +1,28 @@
+import { z } from "zod";
+import { createTRPCRouter, teamProcedure } from "~/server/api/trpc";
+import { LimitService } from "~/server/service/limit-service";
+import { LimitReason } from "~/lib/constants/plans";
+
+export const limitsRouter = createTRPCRouter({
+  get: teamProcedure
+    .input(
+      z.object({
+        type: z.nativeEnum(LimitReason),
+      }),
+    )
+    .query(async ({ ctx, input }) => {
+      switch (input.type) {
+        case LimitReason.CONTACT_BOOK:
+          return LimitService.checkContactBookLimit(ctx.team.id);
+        case LimitReason.DOMAIN:
+          return LimitService.checkDomainLimit(ctx.team.id);
+        case LimitReason.TEAM_MEMBER:
+          return LimitService.checkTeamMemberLimit(ctx.team.id);
+        case LimitReason.EMAIL:
+          return LimitService.checkEmailLimit(ctx.team.id);
+        default:
+          // exhaustive guard
+          throw new Error("Unsupported limit type");
+      }
+    }),
+});
diff --git a/apps/web/src/server/api/routers/team.ts b/apps/web/src/server/api/routers/team.ts
index 921add0..c938776 100644
--- a/apps/web/src/server/api/routers/team.ts
+++ b/apps/web/src/server/api/routers/team.ts
@@ -1,6 +1,4 @@
-import { TRPCError } from "@trpc/server";
 import { z } from "zod";
-import { env } from "~/env";
 
 import {
   createTRPCRouter,
@@ -8,94 +6,25 @@ import {
   teamProcedure,
   teamAdminProcedure,
 } from "~/server/api/trpc";
-import { sendTeamInviteEmail } from "~/server/mailer";
-import send from "~/server/public-api/api/emails/send-email";
-import { logger } from "~/server/logger/log";
+import { TeamService } from "~/server/service/team-service";
 
 export const teamRouter = createTRPCRouter({
   createTeam: protectedProcedure
     .input(z.object({ name: z.string() }))
     .mutation(async ({ ctx, input }) => {
-      const teams = await ctx.db.team.findMany({
-        where: {
-          teamUsers: {
-            some: {
-              userId: ctx.session.user.id,
-            },
-          },
-        },
-      });
-
-      if (teams.length > 0) {
-        logger.info({ userId: ctx.session.user.id }, "User already has a team");
-        return;
-      }
-
-      if (!env.NEXT_PUBLIC_IS_CLOUD) {
-        const _team = await ctx.db.team.findFirst();
-        if (_team) {
-          throw new TRPCError({
-            message: "Can't have multiple teams in self hosted version",
-            code: "UNAUTHORIZED",
-          });
-        }
-      }
-
-      return ctx.db.team.create({
-        data: {
-          name: input.name,
-          teamUsers: {
-            create: {
-              userId: ctx.session.user.id,
-              role: "ADMIN",
-            },
-          },
-        },
-      });
+      return TeamService.createTeam(ctx.session.user.id, input.name);
     }),
 
   getTeams: protectedProcedure.query(async ({ ctx }) => {
-    const teams = await ctx.db.team.findMany({
-      where: {
-        teamUsers: {
-          some: {
-            userId: ctx.session.user.id,
-          },
-        },
-      },
-      include: {
-        teamUsers: {
-          where: {
-            userId: ctx.session.user.id,
-          },
-        },
-      },
-    });
-
-    return teams;
+    return TeamService.getUserTeams(ctx.session.user.id);
   }),
 
   getTeamUsers: teamProcedure.query(async ({ ctx }) => {
-    const teamUsers = await ctx.db.teamUser.findMany({
-      where: {
-        teamId: ctx.team.id,
-      },
-      include: {
-        user: true,
-      },
-    });
-
-    return teamUsers;
+    return TeamService.getTeamUsers(ctx.team.id);
   }),
 
   getTeamInvites: teamProcedure.query(async ({ ctx }) => {
-    const teamInvites = await ctx.db.teamInvite.findMany({
-      where: {
-        teamId: ctx.team.id,
-      },
-    });
-
-    return teamInvites;
+    return TeamService.getTeamInvites(ctx.team.id);
   }),
 
   createTeamInvite: teamAdminProcedure
@@ -107,44 +36,13 @@ export const teamRouter = createTRPCRouter({
       })
     )
     .mutation(async ({ ctx, input }) => {
-      if (!input.email) {
-        throw new TRPCError({
-          code: "BAD_REQUEST",
-          message: "Email is required",
-        });
-      }
-
-      const user = await ctx.db.user.findUnique({
-        where: {
-          email: input.email,
-        },
-        include: {
-          teamUsers: true,
-        },
-      });
-
-      if (user && user.teamUsers.length > 0) {
-        throw new TRPCError({
-          code: "BAD_REQUEST",
-          message: "User already part of a team",
-        });
-      }
-
-      const teamInvite = await ctx.db.teamInvite.create({
-        data: {
-          teamId: ctx.team.id,
-          email: input.email,
-          role: input.role,
-        },
-      });
-
-      const teamUrl = `${env.NEXTAUTH_URL}/join-team?inviteId=${teamInvite.id}`;
-
-      if (input.sendEmail) {
-        await sendTeamInviteEmail(input.email, teamUrl, ctx.team.name);
-      }
-
-      return teamInvite;
+      return TeamService.createTeamInvite(
+        ctx.team.id,
+        input.email,
+        input.role,
+        ctx.team.name,
+        input.sendEmail
+      );
     }),
 
   updateTeamUserRole: teamAdminProcedure
@@ -155,150 +53,33 @@ export const teamRouter = createTRPCRouter({
       })
     )
     .mutation(async ({ ctx, input }) => {
-      const teamUser = await ctx.db.teamUser.findFirst({
-        where: {
-          teamId: ctx.team.id,
-          userId: Number(input.userId),
-        },
-      });
-
-      if (!teamUser) {
-        throw new TRPCError({
-          code: "NOT_FOUND",
-          message: "Team member not found",
-        });
-      }
-
-      // Check if this is the last admin
-      const adminCount = await ctx.db.teamUser.count({
-        where: {
-          teamId: ctx.team.id,
-          role: "ADMIN",
-        },
-      });
-
-      if (adminCount === 1 && teamUser.role === "ADMIN") {
-        throw new TRPCError({
-          code: "FORBIDDEN",
-          message: "Need at least one admin",
-        });
-      }
-
-      return ctx.db.teamUser.update({
-        where: {
-          teamId_userId: {
-            teamId: ctx.team.id,
-            userId: Number(input.userId),
-          },
-        },
-        data: {
-          role: input.role,
-        },
-      });
+      return TeamService.updateTeamUserRole(
+        ctx.team.id,
+        input.userId,
+        input.role
+      );
     }),
 
   deleteTeamUser: teamProcedure
     .input(z.object({ userId: z.string() }))
     .mutation(async ({ ctx, input }) => {
-      const teamUser = await ctx.db.teamUser.findFirst({
-        where: {
-          teamId: ctx.team.id,
-          userId: Number(input.userId),
-        },
-      });
-
-      if (!teamUser) {
-        throw new TRPCError({
-          code: "NOT_FOUND",
-          message: "Team member not found",
-        });
-      }
-
-      if (
-        ctx.teamUser.role !== "ADMIN" &&
-        ctx.session.user.id !== Number(input.userId)
-      ) {
-        throw new TRPCError({
-          code: "UNAUTHORIZED",
-          message: "You are not authorized to delete this team member",
-        });
-      }
-
-      // Check if this is the last admin
-      const adminCount = await ctx.db.teamUser.count({
-        where: {
-          teamId: ctx.team.id,
-          role: "ADMIN",
-        },
-      });
-
-      if (adminCount === 1 && teamUser.role === "ADMIN") {
-        throw new TRPCError({
-          code: "FORBIDDEN",
-          message: "Need at least one admin",
-        });
-      }
-
-      return ctx.db.teamUser.delete({
-        where: {
-          teamId_userId: {
-            teamId: ctx.team.id,
-            userId: Number(input.userId),
-          },
-        },
-      });
+      return TeamService.deleteTeamUser(
+        ctx.team.id,
+        input.userId,
+        ctx.teamUser.role,
+        ctx.session.user.id
+      );
     }),
 
   resendTeamInvite: teamAdminProcedure
     .input(z.object({ inviteId: z.string() }))
     .mutation(async ({ ctx, input }) => {
-      const invite = await ctx.db.teamInvite.findUnique({
-        where: {
-          id: input.inviteId,
-        },
-      });
-
-      if (!invite) {
-        throw new TRPCError({
-          code: "NOT_FOUND",
-          message: "Invite not found",
-        });
-      }
-
-      const teamUrl = `${env.NEXTAUTH_URL}/join-team?inviteId=${invite.id}`;
-
-      // TODO: Implement email sending logic
-      await sendTeamInviteEmail(invite.email, teamUrl, ctx.team.name);
-
-      return { success: true };
+      return TeamService.resendTeamInvite(input.inviteId, ctx.team.name);
     }),
 
   deleteTeamInvite: teamAdminProcedure
     .input(z.object({ inviteId: z.string() }))
     .mutation(async ({ ctx, input }) => {
-      const invite = await ctx.db.teamInvite.findFirst({
-        where: {
-          teamId: ctx.team.id,
-          id: {
-            equals: input.inviteId,
-          },
-        },
-      });
-
-      if (!invite) {
-        throw new TRPCError({
-          code: "NOT_FOUND",
-          message: "Invite not found",
-        });
-      }
-
-      return ctx.db.teamInvite.delete({
-        where: {
-          teamId_email: {
-            teamId: ctx.team.id,
-            email: invite.email,
-          },
-        },
-      });
+      return TeamService.deleteTeamInvite(ctx.team.id, input.inviteId);
     }),
 });
diff --git a/apps/web/src/server/billing/payments.ts b/apps/web/src/server/billing/payments.ts
index 13ea9b4..aa56446 100644
--- a/apps/web/src/server/billing/payments.ts
+++ b/apps/web/src/server/billing/payments.ts
@@ -47,7 +47,11 @@ export async function createCheckoutSessionForTeam(teamId: number) {
     customerId = customer.id;
   }
 
-  if (!env.STRIPE_BASIC_PRICE_ID || !customerId) {
+  if (
+    !env.STRIPE_BASIC_PRICE_ID ||
+    !env.STRIPE_BASIC_USAGE_PRICE_ID ||
+    !customerId
+  ) {
     throw new Error("Stripe prices are not set");
   }
 
@@ -57,6 +61,10 @@ export async function createCheckoutSessionForTeam(teamId: number) {
     line_items: [
       {
         price: env.STRIPE_BASIC_PRICE_ID,
+        quantity: 1,
+      },
+      {
+        price: env.STRIPE_BASIC_USAGE_PRICE_ID,
       },
     ],
     success_url: `${env.NEXTAUTH_URL}/payments?success=true&session_id={CHECKOUT_SESSION_ID}`,
@@ -70,8 +78,13 @@ export async function createCheckoutSessionForTeam(teamId: number) {
   return session;
 }
 
-function getPlanFromPriceId(priceId: string) {
-  if (priceId === env.STRIPE_BASIC_PRICE_ID) {
+function getPlanFromPriceIds(priceIds: string[]) {
+  if (
+    (env.STRIPE_BASIC_PRICE_ID &&
+      priceIds.includes(env.STRIPE_BASIC_PRICE_ID)) ||
+    (env.STRIPE_LEGACY_BASIC_PRICE_ID &&
+      priceIds.includes(env.STRIPE_LEGACY_BASIC_PRICE_ID))
+  ) {
     return "BASIC";
   }
 
@@ -129,11 +142,16 @@ export async function syncStripeData(customerId: string) {
     return;
   }
 
+  const priceIds = subscription.items.data
+    .map((item) => item.price?.id)
+    .filter((id): id is string => Boolean(id));
+
   await db.subscription.upsert({
     where: { id: subscription.id },
     update: {
       status: subscription.status,
       priceId: subscription.items.data[0]?.price?.id || "",
+      priceIds: priceIds,
       currentPeriodEnd: new Date(
         subscription.items.data[0]?.current_period_end * 1000
       ),
@@ -150,6 +168,7 @@ export async function syncStripeData(customerId: string) {
       id: subscription.id,
       status: subscription.status,
       priceId: subscription.items.data[0]?.price?.id || "",
+      priceIds: priceIds,
       currentPeriodEnd: new Date(
         subscription.items.data[0]?.current_period_end * 1000
       ),
@@ -167,7 +186,7 @@ export async function syncStripeData(customerId: string) {
   await db.team.update({
     where: { id: team.id },
     data: {
-      plan: getPlanFromPriceId(subscription.items.data[0]?.price?.id || ""),
+      plan: getPlanFromPriceIds(priceIds),
       isActive: subscription.status === "active",
     },
   });
diff --git a/apps/web/src/server/service/contact-book-service.ts b/apps/web/src/server/service/contact-book-service.ts
new file mode 100644
index 0000000..7714909
--- /dev/null
+++ b/apps/web/src/server/service/contact-book-service.ts
@@ -0,0 +1,83 @@
+import { CampaignStatus, type ContactBook } from "@prisma/client";
+import { db } from "../db";
+import { LimitService } from "./limit-service";
+import { UnsendApiError } from "../public-api/api-error";
+
+export async function getContactBooks(teamId: number, search?: string) {
+  return db.contactBook.findMany({
+    where: {
+      teamId,
+      ...(search ? { name: { contains: search, mode: "insensitive" } } : {}),
+    },
+    include: {
+      _count: {
+        select: { contacts: true },
+      },
+    },
+  });
+}
+
+export async function createContactBook(teamId: number, name: string) {
+  const { isLimitReached, reason } =
+    await LimitService.checkContactBookLimit(teamId);
+
+  if (isLimitReached) {
+    throw new UnsendApiError({
+      code: "FORBIDDEN",
+      message: reason ?? "Contact book limit reached",
+    });
+  }
+
+  return db.contactBook.create({
+    data: {
+      name,
+      teamId,
+      properties: {},
+    },
+  });
+}
+
+export async function getContactBookDetails(contactBookId: string) {
+  const [totalContacts, unsubscribedContacts, campaigns] = await Promise.all([
+    db.contact.count({
+      where: { contactBookId },
+    }),
+    db.contact.count({
+      where: { contactBookId, subscribed: false },
+    }),
+    db.campaign.findMany({
+      where: {
+        contactBookId,
+        status: CampaignStatus.SENT,
+      },
+      orderBy: {
+        createdAt: "desc",
+      },
+      take: 2,
+    }),
+  ]);
+
+  return {
+    totalContacts,
+    unsubscribedContacts,
+    campaigns,
+  };
+}
+
+export async function updateContactBook(
+  contactBookId: string,
+  data: {
+    name?: string;
+    properties?: Record<string, string>;
+    emoji?: string;
+  }
+) {
+  return db.contactBook.update({
+    where: { id: contactBookId },
+    data,
+  });
+}
+
+export async function deleteContactBook(contactBookId: string) {
+  return db.contactBook.delete({ where: { id: contactBookId } });
+}
diff --git a/apps/web/src/server/service/domain-service.ts b/apps/web/src/server/service/domain-service.ts
index 84cffe2..38c38dd 100644
--- a/apps/web/src/server/service/domain-service.ts
+++ b/apps/web/src/server/service/domain-service.ts
@@ -6,6 +6,7 @@ import { db } from "~/server/db";
 import { SesSettingsService } from "./ses-settings-service";
 import { UnsendApiError } from "../public-api/api-error";
 import { logger } from "../logger/log";
+import { LimitService } from "./limit-service";
 
 const dnsResolveTxt = util.promisify(dns.resolveTxt);
 
@@ -58,7 +59,7 @@ export async function createDomain(
   teamId: number,
   name: string,
   region: string,
-  sesTenantId?: string,
+  sesTenantId?: string
 ) {
   const domainStr = tldts.getDomain(name);
 
@@ -74,6 +75,16 @@ export async function createDomain(
     throw new Error("Ses setting not found");
   }
 
+  const { isLimitReached, reason } =
+    await LimitService.checkDomainLimit(teamId);
+
+  if (isLimitReached) {
+    throw new UnsendApiError({
+      code: "FORBIDDEN",
+      message: reason ?? "Domain limit reached",
+    });
+  }
+
   const subdomain = tldts.getSubdomain(name);
   const publicKey = await ses.addDomain(name, region, sesTenantId);
 
@@ -105,7 +116,7 @@ export async function getDomain(id: number) {
   if (domain.isVerifying) {
     const domainIdentity = await ses.getDomainIdentity(
       domain.name,
-      domain.region,
+      domain.region
     );
 
     const dkimStatus = domainIdentity.DkimAttributes?.Status;
@@ -150,7 +161,7 @@ export async function getDomain(id: number) {
 
 export async function updateDomain(
   id: number,
-  data: { clickTracking?: boolean; openTracking?: boolean },
+  data: { clickTracking?: boolean; openTracking?: boolean }
 ) {
   return db.domain.update({
     where: { id },
@@ -170,7 +181,7 @@ export async function deleteDomain(id: number) {
   const deleted = await ses.deleteDomain(
     domain.name,
     domain.region,
-    domain.sesTenantId ?? undefined,
+    domain.sesTenantId ?? undefined
   );
 
   if (!deleted) {
diff --git a/apps/web/src/server/service/limit-service.ts b/apps/web/src/server/service/limit-service.ts
new file mode 100644
index 0000000..867848f
--- /dev/null
+++ b/apps/web/src/server/service/limit-service.ts
@@ -0,0 +1,160 @@
+import { PLAN_LIMITS, LimitReason } from "~/lib/constants/plans";
+import { db } from "../db";
+import { getThisMonthUsage } from "./usage-service";
+
+function isLimitExceeded(current: number, limit: number): boolean {
+  if (limit === -1) return false; // unlimited
+  return current >= limit;
+}
+
+export class LimitService {
+  static async checkDomainLimit(teamId: number): Promise<{
+    isLimitReached: boolean;
+    limit: number;
+    reason?: LimitReason;
+  }> {
+    const team = await db.team.findUnique({
+      where: { id: teamId },
+      include: {
+        _count: {
+          select: {
+            domains: true,
+          },
+        },
+      },
+    });
+
+    if (!team) {
+      throw new Error("Team not found");
+    }
+
+    const limit = PLAN_LIMITS[team.plan].domains;
+    if (isLimitExceeded(team._count.domains, limit)) {
+      return {
+        isLimitReached: true,
+        limit,
+        reason: LimitReason.DOMAIN,
+      };
+    }
+
+    return {
+      isLimitReached: false,
+      limit,
+    };
+  }
+
+  static async checkContactBookLimit(teamId: number): Promise<{
+    isLimitReached: boolean;
+    limit: number;
+    reason?: LimitReason;
+  }> {
+    const team = await db.team.findUnique({
+      where: { id: teamId },
+      include: {
+        _count: {
+          select: {
+            contactBooks: true,
+          },
+        },
+      },
+    });
+
+    if (!team) {
+      throw new Error("Team not found");
+    }
+
+    const limit = PLAN_LIMITS[team.plan].contactBooks;
+    if (isLimitExceeded(team._count.contactBooks, limit)) {
+      return {
+        isLimitReached: true,
+        limit,
+        reason: LimitReason.CONTACT_BOOK,
+      };
+    }
+
+    return {
+      isLimitReached: false,
+      limit,
+    };
+  }
+
+  static async checkTeamMemberLimit(teamId: number): Promise<{
+    isLimitReached: boolean;
+    limit: number;
+    reason?: LimitReason;
+  }> {
+    const team = await db.team.findUnique({
+      where: { id: teamId },
+      include: {
+        teamUsers: true,
+      },
+    });
+
+    if (!team) {
+      throw new Error("Team not found");
+    }
+
+    const limit = PLAN_LIMITS[team.plan].teamMembers;
+    if (isLimitExceeded(team.teamUsers.length, limit)) {
+      return {
+        isLimitReached: true,
+        limit,
+        reason: LimitReason.TEAM_MEMBER,
+      };
+    }
+
+    return {
+      isLimitReached: false,
+      limit,
+    };
+  }
+
+  static async checkEmailLimit(teamId: number): Promise<{
+    isLimitReached: boolean;
+    limit: number;
+    reason?: LimitReason;
+  }> {
+    const team = await db.team.findUnique({
+      where: { id: teamId },
+    });
+
+    if (!team) {
+      throw new Error("Team not found");
+    }
+
+    // FREE plan has hard limits; paid plans are unlimited (-1)
+    if (team.plan === "FREE") {
+      const usage = await getThisMonthUsage(teamId);
+
+      const monthlyUsage = usage.month.reduce(
+        (acc, curr) => acc + curr.sent,
+        0,
+      );
+      const dailyUsage = usage.day.reduce((acc, curr) => acc + curr.sent, 0);
+
+      const monthlyLimit = PLAN_LIMITS[team.plan].emailsPerMonth;
+      const dailyLimit = PLAN_LIMITS[team.plan].emailsPerDay;
+
+      if (isLimitExceeded(monthlyUsage, monthlyLimit)) {
+        return {
+          isLimitReached: true,
+          limit: monthlyLimit,
+          reason: LimitReason.EMAIL,
+        };
+      }
+
+      if (isLimitExceeded(dailyUsage, dailyLimit)) {
+        return {
+          isLimitReached: true,
+          limit: dailyLimit,
+          reason: LimitReason.EMAIL,
+        };
+      }
+    }
+
+    return {
+      isLimitReached: false,
+      limit: PLAN_LIMITS[team.plan].emailsPerMonth,
+    };
+  }
+}
diff --git a/apps/web/src/server/service/team-service.ts b/apps/web/src/server/service/team-service.ts
new file mode 100644
index 0000000..f7c6c61
--- /dev/null
+++ b/apps/web/src/server/service/team-service.ts
@@ -0,0 +1,293 @@
+import { TRPCError } from "@trpc/server";
+import { env } from "~/env";
+import { db } from "~/server/db";
+import { sendTeamInviteEmail } from "~/server/mailer";
+import { logger } from "~/server/logger/log";
+import type { Team, TeamInvite } from "@prisma/client";
+import { LimitService } from "./limit-service";
+import { UnsendApiError } from "../public-api/api-error";
+
+export class TeamService {
+  static async createTeam(
+    userId: number,
+    name: string
+  ): Promise<Team | undefined> {
+    const teams = await db.team.findMany({
+      where: {
+        teamUsers: {
+          some: {
+            userId: userId,
+          },
+        },
+      },
+    });
+
+    if (teams.length > 0) {
+      logger.info({ userId }, "User already has a team");
+      return;
+    }
+
+    if (!env.NEXT_PUBLIC_IS_CLOUD) {
+      const _team = await db.team.findFirst();
+      if (_team) {
+        throw new TRPCError({
+          message: "Can't have multiple teams in self hosted version",
+          code: "UNAUTHORIZED",
+        });
+      }
+    }
+
+    return db.team.create({
+      data: {
+        name,
+        teamUsers: {
+          create: {
+            userId,
+            role: "ADMIN",
+          },
+        },
+      },
+    });
+  }
+
+  static async getUserTeams(userId: number) {
+    return db.team.findMany({
+      where: {
+        teamUsers: {
+          some: {
+            userId: userId,
+          },
+        },
+      },
+      include: {
+        teamUsers: {
+          where: {
+            userId: userId,
+          },
+        },
+      },
+    });
+  }
+
+  static async getTeamUsers(teamId: number) {
+    return db.teamUser.findMany({
+      where: {
+        teamId,
+      },
+      include: {
+        user: true,
+      },
+    });
+  }
+
+  static async getTeamInvites(teamId: number) {
+    return db.teamInvite.findMany({
+      where: {
+        teamId,
+      },
+    });
+  }
+
+  static async createTeamInvite(
+    teamId: number,
+    email: string,
+    role: "MEMBER" | "ADMIN",
+    teamName: string,
+    sendEmail: boolean = true
+  ): Promise<TeamInvite> {
+    if (!email) {
+      throw new TRPCError({
+        code: "BAD_REQUEST",
+        message: "Email is required",
+      });
+    }
+
+    const { isLimitReached, reason } =
+      await LimitService.checkTeamMemberLimit(teamId);
+    if (isLimitReached) {
+      throw new UnsendApiError({
+        code: "FORBIDDEN",
+        message: reason ?? "Team invite limit reached",
+      });
+    }
+
+    const user = await db.user.findUnique({
+      where: {
+        email,
+      },
+      include: {
+        teamUsers: true,
+      },
+    });
+
+    if (user && user.teamUsers.length > 0) {
+      throw new TRPCError({
+        code: "BAD_REQUEST",
+        message: "User already part of a team",
+      });
+    }
+
+    const teamInvite = await db.teamInvite.create({
+      data: {
+        teamId,
+        email,
+        role,
+      },
+    });
+
+    const teamUrl = `${env.NEXTAUTH_URL}/join-team?inviteId=${teamInvite.id}`;
+
+    if (sendEmail) {
+      await sendTeamInviteEmail(email, teamUrl, teamName);
+    }
+
+    return teamInvite;
+  }
+
+  static async updateTeamUserRole(
+    teamId: number,
+    userId: string,
+    role: "MEMBER" | "ADMIN"
+  ) {
+    const teamUser = await db.teamUser.findFirst({
+      where: {
+        teamId,
+        userId: Number(userId),
+      },
+    });
+
+    if (!teamUser) {
+      throw new TRPCError({
+        code: "NOT_FOUND",
+        message: "Team member not found",
+      });
+    }
+
+    // Check if this is the last admin
+    const adminCount = await db.teamUser.count({
+      where: {
+        teamId,
+        role: "ADMIN",
+      },
+    });
+
+    if (adminCount === 1 && teamUser.role === "ADMIN") {
+      throw new TRPCError({
+        code: "FORBIDDEN",
+        message: "Need at least one admin",
+      });
+    }
+
+    return db.teamUser.update({
+      where: {
+        teamId_userId: {
+          teamId,
+          userId: Number(userId),
+        },
+      },
+      data: {
+        role,
+      },
+    });
+  }
+
+  static async deleteTeamUser(
+    teamId: number,
+    userId: string,
+    requestorRole: string,
+    requestorId: number
+  ) {
+    const teamUser = await db.teamUser.findFirst({
+      where: {
+        teamId,
+        userId: Number(userId),
+      },
+    });
+
+    if (!teamUser) {
+      throw new TRPCError({
+        code: "NOT_FOUND",
+        message: "Team member not found",
+      });
+    }
+
+    if (requestorRole !== "ADMIN" && requestorId !== Number(userId)) {
+      throw new TRPCError({
+        code: "UNAUTHORIZED",
+        message: "You are not authorized to delete this team member",
+      });
+    }
+
+    // Check if this is the last admin
+    const adminCount = await db.teamUser.count({
+      where: {
+        teamId,
+        role: "ADMIN",
+      },
+    });
+
+    if (adminCount === 1 && teamUser.role === "ADMIN") {
+      throw new TRPCError({
+        code: "FORBIDDEN",
+        message: "Need at least one admin",
+      });
+    }
+
+    return db.teamUser.delete({
+      where: {
+        teamId_userId: {
+          teamId,
+          userId: Number(userId),
+        },
+      },
+    });
+  }
+
+  static async resendTeamInvite(inviteId: string, teamName: string) {
+    const invite = await db.teamInvite.findUnique({
+      where: {
+        id: inviteId,
+      },
+    });
+
+    if (!invite) {
+      throw new TRPCError({
+        code: "NOT_FOUND",
+        message: "Invite not found",
+      });
+    }
+
+    const teamUrl = `${env.NEXTAUTH_URL}/join-team?inviteId=${invite.id}`;
+
+    await sendTeamInviteEmail(invite.email, teamUrl, teamName);
+
+    return { success: true };
+  }
+
+  static async deleteTeamInvite(teamId: number, inviteId: string) {
+    const invite = await db.teamInvite.findFirst({
+      where: {
+        teamId,
+        id: {
+          equals: inviteId,
+        },
+      },
+    });
+
+    if (!invite) {
+      throw new TRPCError({
+        code: "NOT_FOUND",
+        message: "Invite not found",
+      });
+    }
+
+    return db.teamInvite.delete({
+      where: {
+        teamId_email: {
+          teamId,
+          email: invite.email,
+        },
+      },
+    });
+  }
+}
diff --git a/apps/web/src/server/service/usage-service.ts b/apps/web/src/server/service/usage-service.ts
new file mode 100644
index 0000000..c6adf2f
--- /dev/null
+++ b/apps/web/src/server/service/usage-service.ts
@@ -0,0 +1,63 @@
+import { EmailUsageType, Subscription } from "@prisma/client";
+import { db } from "../db";
+import { format } from "date-fns";
+
+/**
+ * Gets the monthly and daily usage for a team
+ * @param teamId - The team ID to get usage for
+ * @param db - Prisma database client
+ * @param subscription - Optional subscription to determine billing period start
+ * @returns Object containing month and day usage arrays
+ */
+export async function getThisMonthUsage(teamId: number) {
+  const team = await db.team.findUnique({
+    where: { id: teamId },
+  });
+
+  if (!team) {
+    throw new Error("Team not found");
+  }
+
+  let subscription: Subscription | null = null;
+  const isPaidPlan = team.plan !== "FREE";
+
+  if (isPaidPlan) {
+    subscription = await db.subscription.findFirst({
+      where: { teamId: team.id },
+      orderBy: { status: "asc" },
+    });
+  }
+
+  const isoStartDate = subscription?.currentPeriodStart
+    ? format(subscription.currentPeriodStart, "yyyy-MM-dd")
+    : format(new Date(), "yyyy-MM-01"); // First day of current month
+  const today = format(new Date(), "yyyy-MM-dd");
+
+  const [monthUsage, dayUsage] = await Promise.all([
+    // Get month usage
+    db.$queryRaw<Array<{ type: EmailUsageType; sent: number }>>`
+        SELECT 
+          type,
+          SUM(sent)::integer AS sent
+        FROM "DailyEmailUsage"
+        WHERE "teamId" = ${team.id}
+        AND "date" >= ${isoStartDate}
+        GROUP BY "type"
+      `,
+    // Get today's usage
+    db.$queryRaw<Array<{ type: EmailUsageType; sent: number }>>`
+        SELECT 
+          type,
+          SUM(sent)::integer AS sent
+        FROM "DailyEmailUsage"
+        WHERE "teamId" = ${team.id}
+        AND "date" = ${today}
+        GROUP BY "type"
+      `,
+  ]);
+
+  return {
+    month: monthUsage,
+    day: dayUsage,
+  };
+}
diff --git a/apps/web/src/store/upgradeModalStore.ts b/apps/web/src/store/upgradeModalStore.ts
new file mode 100644
index 0000000..72b4ec0
--- /dev/null
+++ b/apps/web/src/store/upgradeModalStore.ts
@@ -0,0 +1,20 @@
+import { create } from "zustand";
+import { LimitReason } from "~/lib/constants/plans";
+
+interface UpgradeModalStore {
+  isOpen: boolean;
+  reason?: LimitReason;
+  action: {
+    openModal: (reason?: LimitReason) => void;
+    closeModal: () => void;
+  };
+}
+
+export const useUpgradeModalStore = create<UpgradeModalStore>((set) => ({
+  isOpen: false,
+  reason: undefined,
+  action: {
+    openModal: (reason?: LimitReason) => set({ isOpen: true, reason }),
+    closeModal: () => set({ isOpen: false, reason: undefined }),
+  },
+}));
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2277560..c51561c 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -281,6 +281,9 @@ importers:
       zod:
         specifier: ^3.24.3
         version: 3.24.3
+      zustand:
+        specifier: ^5.0.8
+        version: 5.0.8(@types/react@19.1.2)(react@19.1.0)
     devDependencies:
       '@next/eslint-plugin-next':
         specifier: ^15.3.1
@@ -18071,5 +18074,27 @@ packages:
   /zod@3.24.3:
     resolution: {integrity: sha512-HhY1oqzWCQWuUqvBFnsyrtZRhyPeR7SUGv+C4+MsisMuVfSPx8HpwWqH8tRahSlt6M3PiFAcoeFhZAqIXTxoSg==}
 
+  /zustand@5.0.8(@types/react@19.1.2)(react@19.1.0):
+    resolution: {integrity: sha512-gyPKpIaxY9XcO2vSMrLbiER7QMAMGOQZVRdJ6Zi782jkbzZygq5GI9nG8g+sMgitRtndwaBSl7uiqC49o1SSiw==}
+    engines: {node: '>=12.20.0'}
+    peerDependencies:
+      '@types/react': '>=18.0.0'
+      immer: '>=9.0.6'
+      react: '>=18.0.0'
+      use-sync-external-store: '>=1.2.0'
+    peerDependenciesMeta:
+      '@types/react':
+        optional: true
+      immer:
+        optional: true
+      react:
+        optional: true
+      use-sync-external-store:
+        optional: true
+    dependencies:
+      '@types/react': 19.1.2
+      react: 19.1.0
+    dev: false
+
   /zwitch@2.0.4:
     resolution: {integrity: sha512-bXE4cR/kVZhKZX/RjPEflHaKVhUVl85noU3v6b8apfQEc1x4A+zBxjZ4lN8LqGd6WZ3dl98pY4o717VFmoPp+A==}