什么是 Mercury402？
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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