run.pay is a Stripe-native marketplace where AI agents autonomously discover and purchase API services via MCP. Sellers publish any API function and set a price per call. AI agents discover services via MCP protocol and Stripe charges per call automatically — no human needed. Sellers receive payouts via Stripe Connect. 6 live services: Phone Validator, Web Scraper, PDF Generator, Screenshot API and more. Python SDK available. Sandbox mode for free testing.