Mercury402
Monetize any API with pay-per-call payments
What it does
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.
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- XAX402 – an open standard for internet native payments2025 · x402.org · ▲16
Hi HN – excited to announce x402, initially developed by Coinbase (YC 12) x402 lets any HTTP API charge per request without issuing API keys or storing credit cards. Buyers (humans or AI agents) keep funds in their own wallet and dynamically discover compatible endpoints, call them as usual, and automatically pay a microtransaction in USDC or other tokens to settle. 90 second demo: https://www.youtube.com/watch?v=PV-L2AfLhJg Problem: Every time we want to use a new API we have to: find the service online create a developer account, copy a secret key into env vars, pre-fund or…
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