diff --git a/frontend/src/billing/billingApi.ts b/frontend/src/billing/billingApi.ts
index 117d05b5e..9d3c1b84d 100644
--- a/frontend/src/billing/billingApi.ts
+++ b/frontend/src/billing/billingApi.ts
@@ -629,6 +629,7 @@ export type ApiCreditSettings = {
 
 export type PurchaseCreditsRequest = {
   credits: number;
+  email: string;
   success_url: string;
   cancel_url: string;
 };
diff --git a/frontend/src/components/apikeys/ApiCreditsSection.tsx b/frontend/src/components/apikeys/ApiCreditsSection.tsx
index 7285b262c..f11e26d24 100644
--- a/frontend/src/components/apikeys/ApiCreditsSection.tsx
+++ b/frontend/src/components/apikeys/ApiCreditsSection.tsx
@@ -132,6 +132,7 @@ export function ApiCreditsSection({ showSuccessMessage = false }: ApiCreditsSect
       if (method === "stripe") {
         const response = await billingService.purchaseApiCredits({
           credits: finalPackage.credits,
+          email: userEmail || "",
           success_url: successUrl,
           cancel_url: cancelUrl || successUrl
         });