stripe-mpp

Expert in the Machine Payments Protocol (MPP) — the open standard co-authored by Stripe and Tempo Labs for HTTP 402-based machine-to-machine payments. Deep conceptual knowledge of the HTTP 402 challenge-response flow, charge and session payment intents, Tempo blockchain settlement, Stripe SPT integration, mppx SDK (TypeScript/Python/Rust), server middleware (Hono/Express/Next.js/Elysia), client-side transparent payment, payment proxy patterns, service discovery (OpenAPI x-payment-info, llms.txt), and the IETF Payment HTTP Authentication Scheme draft. Always fetches the latest specification, SDK docs, and API references before writing implementation code.

Implement MPP one-time charge payment flows — per-request payment gates for API monetization, data access, and file downloads. Use when building pay-per-call APIs or protecting individual resources with HTTP 402 charges.

Implement MPP client-side payment handling with mppx.fetch(). Use when building AI agents or automated clients that consume 402-protected APIs, handling the transparent challenge-response payment flow.

Validate MPP implementations against the specification — verify HTTP 402 challenge-response compliance, header formats, payment method correctness, service discovery, and production readiness. Use when auditing an MPP integration or preparing for production launch.

Cross-cutting MPP development patterns — security, replay protection, HMAC challenge binding, receipt validation, error handling, retry logic, TLS requirements, and monitoring. Use when designing architecture or solving production concerns.

Implement MPP payment proxies — wrap existing APIs with HTTP 402 payment gates without modifying the upstream service. Use when monetizing third-party APIs, adding payment layers to existing services, or building API marketplaces.

Implement MPP server-side middleware for Hono, Express, Next.js, and Elysia. Use when protecting API routes with HTTP 402 payment gates, configuring payment methods, or setting up the Mppx server instance.

Implement MPP service discovery — OpenAPI documents with x-payment-info extensions, x-service-info metadata, and llms.txt for autonomous agent discovery. Use when publishing paid API metadata for AI agents to find and pay for your services.

Implement MPP session-based streaming payment flows — authorize-once pay-as-you-go patterns for continuous data feeds, per-token billing, and micropayment aggregation. Use when building streaming APIs or services that charge incrementally.

Scaffold an MPP project — install mppx SDK, configure payment methods, set up server middleware, and create a basic paid API endpoint. Use when starting a new MPP machine payments project from scratch.

Implement Shared Payment Token (SPT) lifecycle management for MPP — creation, usage, deactivation, webhook events, and reconciliation. Use when building the fiat/card payment flow within MPP using Stripe SPTs.

Configure Stripe as an MPP payment method — card and wallet payments via Shared Payment Tokens (SPTs), integrating MPP's HTTP 402 flow with Stripe's payment infrastructure. Use when enabling fiat/card payments for machine-to-machine transactions.

Configure Tempo blockchain as an MPP payment method — USDC stablecoin payments with sub-second finality, 100,000+ TPS, and no gas volatility. Use when setting up crypto-native payment rails for machine payments.

1 hook across 1 event