diff --git a/packages/api/src/routers/auth/auth_router.ts b/packages/api/src/routers/auth/auth_router.ts
index 01be9c019..da7443587 100644
--- a/packages/api/src/routers/auth/auth_router.ts
+++ b/packages/api/src/routers/auth/auth_router.ts
@@ -47,6 +47,7 @@ import {
 } from './google_auth'
 import { createWebAuthToken } from './jwt_helpers'
 import { createMobileAccountCreationResponse } from './mobile/account_creation'
+import { verifyChallengeRecaptcha } from '../../utils/recaptcha'
 
 export interface SignupRequest {
   email: string
@@ -55,6 +56,7 @@ export interface SignupRequest {
   username: string
   bio?: string
   pictureUrl?: string
+  recaptchaToken?: string
 }
 
 const signToken = promisify(jwt.sign)
@@ -499,7 +501,24 @@ export function authRouter() {
           `${env.client.url}/auth/email-signup?errorCodes=INVALID_CREDENTIALS`
         )
       }
-      const { email, password, name, username, bio, pictureUrl } = req.body
+      const {
+        email,
+        password,
+        name,
+        username,
+        bio,
+        pictureUrl,
+        recaptchaToken,
+      } = req.body
+
+      if (recaptchaToken) {
+        const verified = await verifyChallengeRecaptcha(recaptchaToken)
+        if (!verified) {
+          return res.redirect(
+            `${env.client.url}/auth/email-signup?errorCodes=UNKNOWN`
+          )
+        }
+      }
 
       function isURLPresent(input: string): boolean {
         const urlRegex = /(https?:\/\/[^\s]+)/g
diff --git a/packages/api/src/utils/recaptcha.ts b/packages/api/src/utils/recaptcha.ts
new file mode 100644
index 000000000..2fa69a626
--- /dev/null
+++ b/packages/api/src/utils/recaptcha.ts
@@ -0,0 +1,49 @@
+import axios from 'axios'
+
+type RecaptchaResponse = {
+  success: Boolean
+  hostname: string
+  score?: number
+  action?: string
+}
+
+const isRecaptchaResponse = (data: any): data is RecaptchaResponse => {
+  return (
+    'success' in data &&
+    'hostname' in data &&
+    'score' in data &&
+    'action' in data
+  )
+}
+
+export const verifyChallengeRecaptcha = async (
+  token: string
+): Promise<Boolean> => {
+  if (!process.env.RECAPTCHA_CHALLENGE_SECRET_KEY) {
+    return false
+  }
+
+  const url = `https://www.google.com/recaptcha/api/siteverify`
+  const params = new URLSearchParams({
+    secret: process.env.RECAPTCHA_CHALLENGE_SECRET_KEY,
+    response: token,
+  })
+
+  try {
+    const response = await axios.post(url, params)
+    console.log('recaptcha response: ', response)
+
+    if (!response.data || !response.data.success) {
+      throw new Error('Failed to verify reCAPTCHA')
+    }
+
+    const json = response.data
+    if (!isRecaptchaResponse(json)) {
+      return false
+    }
+    return json.success
+  } catch (error) {
+    console.error('Error verifying reCAPTCHA:', error)
+    return false
+  }
+}