{"name":"onyx_agent_registry","tier":"metered","price_usdc":"0.05","endpoint":"https://onyx-actions.onrender.com/v1/onyx_agent_registry","method":"POST","input_schema":{"type":"object","properties":{"action":{"type":"string","enum":["census","probe"],"description":"'census' = fast structural audit (no live calls). 'probe' = census + live hollow-detection on a sample.","default":"census"},"registry_url":{"type":"string","description":"Registry agents API. Default a2aregistry.org.","default":"https://www.a2aregistry.org/api/agents?limit=500"},"sample":{"type":"integer","description":"For action='probe': how many agents to live-test (bounded 1-12, default 5). Probed in listed order.","default":5}},"required":[]},"description":"Signed verified-registry audit. Fetches a public A2A agent registry (default a2aregistry.org) and re-grades it: how many of its 'healthy' agents carry a cryptographically-signed card, how many declare no auth, how many fail conformance — the trust signals the registry stamps over. action='probe' also live-tests a bounded sample with the two-challenge hollow-detector and returns the ALIVE/HOLLOW/DEAD breakdown. Ed25519-signed, timestamped, recomputable. Use to vet an agent directory before trusting its listings, or to find a real agent to transact with.","when_to_use":"Before trusting an agent directory's listings, or to find a genuinely live agent to transact with. Use action='census' for a fast signed structural audit of the whole registry; action='probe' to live-test a sample and see how many 'healthy' agents are actually hollow.","vs_alternatives":"a2aregistry/Bazaar stamp every reachable agent 'healthy' from one fixed prompt, verify no card signatures, and run no hollow-detection. This re-grades the same registry on verifiable trust signals and returns a signed, recomputable audit.","example_request":{"action":"probe","sample":5},"example_response":{"ok":true,"census":{"total_listed":129,"registry_marked_healthy":129,"cards_cryptographically_signed":0},"probe":{"sample_size":5,"breakdown":{"alive":2,"hollow":2,"dead":1},"registry_healthy_but_onyx_failed":3}},"settle_to":"0x3fD9ee1373562f894D322B37DFFAd7a5D2b2d78f","network":"base","facilitator":"https://facilitator.xpay.sh","payment_required":true,"free_introspection":true,"note":"GET this URL = free introspection card. POST with x402 payment header to call."}