I Built a Free Compliance Auditor for AI Agent APIs — 32 Checks in 5 Seconds

AI agents are starting to transact with each other. They call APIs, send payments, and make decisions autonomously. But here's the problem: how does one agent know if another agent's API is trustworthy? There's no standard way to verify if an API supports payment protocols, has proper security headers, publishes identity information, or follows regulatory requirements. Until now, the only option was manual review. What I built Probe runs 32 automated compliance checks on any API endpoint in under 5 seconds. No signup, no API key, no cost. You paste a URL, hit "Run audit", and get a scored report covering: Payment protocols — x402 discovery, payment metadata Agent identity — agent.json (A2A), ERC-8004 on-chain identity Security — SSL/TLS, DNSSEC, DMARC/SPF, CAA records, security headers, rate limiting Discovery — MCP server, llms.txt, robots.txt AI crawler rules Documentation — OpenAPI spec, API versioning, Sunset headers Compliance — EU AI Act Article 14 human oversight, FATF Travel Ru