Accept agent payments over Stripe's Machine Payments Protocol (MPP) using the PaymentIntents API so both fiat and stablecoin agent clients can pay for your API

Verified steps

1. Enable MPP in your Stripe dashboard; MPP is an open standard jointly written by Stripe and Tempo, launched March 18, 2026, and is available to Stripe users via the PaymentIntents API.
2. When a client requests a paid resource without payment, return HTTP 402 with payment details in the response body per the MPP spec: include the Stripe PublishableKey, amount, currency, and a PaymentIntent client secret.
3. The agent client constructs a payment using its stored credential (Shared Payment Token for fiat, or stablecoin wallet for USDC), then retries the request with the PaymentIntent ID in the X-Stripe-Payment-Intent header.
4. On the server, confirm the PaymentIntent via stripe.paymentIntents.confirm(id) and verify its status is 'succeeded' before serving the protected resource; include the receipt URL in the X-MPP-Receipt response header.
5. For stablecoin payments, Stripe's MPP also accepts USDC via Shared Payment Tokens with the stablecoin funding source; no separate x402 server implementation is needed if you use Stripe as your MPP facilitator.