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Mercury402 is a pay-per-call financial data API built on the x402 protocol. 76 live endpoints covering Treasury yields, FRED economic series, forex rates, yield spreads, breakeven inflation, macro bundles, and recession probability. No API keys, no subscriptions — just pay per call with USDC on Base. Built for AI agents and autonomous systems. Backed by Coinbase, Cloudflare, and Stripe infrastructure.
Mercury402Monetize any API with pay-per-call payments
Dustin McCormickleft a comment
I tried to add pay-per-call pricing to my API last month. Three days later I was reading Base chain docs, debugging wallet integrations, and wondering why accepting $0.02 per request was harder than building the API itself. So I built Mercury402.
Mercury402Monetize any API with pay-per-call payments