proyectoayuda-data-api
x402Autonomous pay-per-call data API for AI agents (x402 v2, USDC on Base, no account, no API key): 190+ public-data endpoints including daily US stock screen with a short thesis, S&P 500 constituents with breadth, onchain token risk/honeypot verdicts, wallet risk and OFAC screening, allowance/revoke guard, multi-venue funding rates, SEC EDGAR/XBRL/13F, US state and UK company registries, GLEIF LEI, weather alerts, PubMed/ClinicalTrials/Crossref, and DNS/email/HTTP security utilities. A free MCP relay exposes 9 local utilities with no paywall.