{"name":"Live Entity Verification API","description":"Cross-signal Bayesian corroboration of entity existence. Combines WHOIS, Certificate Transparency, Wayback Machine, and DNS operational maturity into a calibrated hallucination verdict.","url":"https://live-entity-verification-production.up.railway.app","version":"1.0.0","documentationUrl":"https://live-entity-verification-production.up.railway.app/docs","provider":{"organization":"nexus-mcp-infra","url":"https://github.com/nexus-mcp-infra/live-entity-verification-sdk"},"capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"defaultInputModes":["application/json"],"defaultOutputModes":["application/json"],"additionalInterfaces":[{"url":"https://live-entity-verification-production.up.railway.app/mcp","transport":"MCP"}],"skills":[{"id":"verify_entity_existence_cross_signal","name":"Cross-Signal Entity Existence Verification","description":"Fuses WHOIS, CT, Wayback, and DNS signals with Bayesian calibrated weights. Returns corroborated existence verdict, hallucination probability, and failure mode classification. Fail-closed: insufficient corroboration returns a blocking verdict rather than an ambiguous null.","tags":["entity-verification","hallucination-detection","bayesian"]},{"id":"resolve_whois_registration_timeline","name":"WHOIS Registration Timeline Resolver","description":"Resolves WHOIS registration timeline. Returns creation, expiration, updated dates, registrar, registrant country, age in days, and historical registrant count where available.","tags":["whois","domain-age"]},{"id":"probe_certificate_transparency_presence","name":"Certificate Transparency Presence Probe","description":"Searches crt.sh CT logs for certificates issued for a domain. Computes certificate count, issuance date range, unique issuers, subdomain count, and continuity score.","tags":["certificate-transparency","crt.sh"]},{"id":"measure_wayback_snapshot_density","name":"Wayback Snapshot Density Meter","description":"Measures Wayback Machine CDX snapshot density over a lookback window. Returns total snapshots, first/last dates, snapshots per year, density score, and coverage gaps in months.","tags":["wayback-machine","cdx"]},{"id":"audit_dns_operational_maturity","name":"DNS Operational Maturity Auditor","description":"Audits DNS operational maturity: MX, SPF, DMARC, DKIM selectors, NS record count, and propagation consistency across resolvers. Returns maturity score and component signals. DNS maturity alone is not sufficient for a VERIFIED_LIVE verdict per the cross-signal spec.","tags":["dns","spf","dmarc","dkim"]}],"metadata":{"protocol_note":"This service implements the Model Context Protocol (MCP) at /mcp, not A2A's own JSONRPC/gRPC/HTTP+JSON task methods (message/send, tasks/get, etc.). This Agent Card is provided for discovery/indexing purposes; A2A-conformant task orchestration is not implemented.","billing_note":"Charged via x402 (Base Sepolia TESTNET, not real funds) since 2026-08-22 -- $0.05/call for the fused cross-signal endpoint, $0.02 for the WHOIS-timeline endpoint (passes through real paid WHOIS spend), $0.01 for the single-signal CT/Wayback/DNS endpoints. Payment settles before the handler runs, at the ASGI middleware layer ahead of request validation -- a call is charged even if it returns a non-VERIFIED verdict or a 400/422. The MCP tool surface at /mcp is currently free (in-process call, not re-metered)."}}