diff --git a/packages/backend/convex/custom/auth/providers/usesend.ts b/packages/backend/convex/custom/auth/providers/usesend.ts
index ae2b68b..c0b94aa 100644
--- a/packages/backend/convex/custom/auth/providers/usesend.ts
+++ b/packages/backend/convex/custom/auth/providers/usesend.ts
@@ -1,39 +1,7 @@
 import type { EmailConfig, EmailUserConfig } from '@auth/core/providers/email';
 import { generateRandomString, RandomReader } from '@oslojs/crypto/random';
 import { alphabet } from 'oslo/crypto';
-
-type UseSendEmailPayload = {
-  from: string;
-  to: string[];
-  subject: string;
-  text: string;
-  html: string;
-};
-
-const sendUseSendEmail = async (
-  apiKey: string,
-  useSendUrl: string,
-  payload: UseSendEmailPayload,
-) => {
-  const response = await fetch(`${useSendUrl}/api/v1/emails`, {
-    method: 'POST',
-    headers: {
-      Authorization: `Bearer ${apiKey}`,
-      'Content-Type': 'application/json',
-    },
-    body: JSON.stringify(payload),
-  });
-
-  if (!response.ok) {
-    let errorBody: unknown;
-    try {
-      errorBody = await response.json();
-    } catch {
-      errorBody = response.statusText;
-    }
-    throw new Error(`UseSend error: ${JSON.stringify(errorBody)}`);
-  }
-};
+import { UseSend } from 'usesend-js';
 
 export default function UseSendProvider(config: EmailUserConfig): EmailConfig {
   return {
@@ -64,11 +32,13 @@ export default function UseSendProvider(config: EmailUserConfig): EmailConfig {
         throw new Error('USESEND_API_KEY and USESEND_URL must be set.');
       }
 
+      const useSend = new UseSend(apiKey, useSendUrl);
+
       // For password reset, we want to send the code, not the magic link
       const isPasswordReset =
         url.includes('reset') || provider.id.includes('reset');
 
-      await sendUseSendEmail(apiKey, useSendUrl, {
+      const result = await useSend.emails.send({
         from: provider.from ?? 'noreply@example.com',
         to: [to],
         subject: isPasswordReset
@@ -100,6 +70,10 @@ export default function UseSendProvider(config: EmailUserConfig): EmailConfig {
           </div>
         `,
       });
+
+      if (result.error) {
+        throw new Error('UseSend error: ' + JSON.stringify(result.error));
+      }
     },
 
     options: config,
diff --git a/scripts/convex-codegen b/scripts/convex-codegen
index fb5de2b..8ca687c 100644
--- a/scripts/convex-codegen
+++ b/scripts/convex-codegen
@@ -30,6 +30,8 @@ has_cloud_deployment_env() {
 }
 
 if has_self_hosted_env || has_cloud_deployment_env; then
+  cd "$ROOT_DIR"
+  bun patch:usesend
   cd "$ROOT_DIR/packages/backend"
   bun run codegen
   exit 0