Mercury402
Monetize any API with pay-per-call payments
Mercury402 launched on April 1, 2026.
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.
76 live pay-per-call financial data APIs for AI agents. Treasury, FRED, forex, spreads, breakeven inflation, macro bundles, and composite dashboards. USDC on Base.
Treasury curves, 53 FRED series endpoints, forex, yield spreads, breakeven inflation, macro bundles, recession probability, and composite dashboards. Pay per call with USDC on Base. No API keys. No subscriptions. No accounts. Mercury402 implements the x402 payment protocol for deterministic financial data: one endpoint, one price, one USDC payment on Base, one signed JSON response. Treasury, FRED, forex, spreads, breakeven inflation, macro intelligence, and composite dashboards are exposed as direct HTTP routes. Your client gets a precise payment descriptor for the requested route, including the exact price and Base USDC settlement details. Your agent submits the x402 payment and Mercury…from mercury402.com
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x4022025 · x402.org · ▲119Hi 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…
x402 wallet API: 9 Base endpoints, USDCAug 2026 · api.kachangsia.com · ▲19 Base endpoints for AI agents, paid in USDC per call
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