{"protocolVersion":"0.3.0","name":"Numbers Online — phone intelligence","description":"Read-only phone intelligence for AI agents: validity, line type, range carrier, country, caller name (CNAM), STIR/SHAKEN verstat, a labeled spam signal, and a first-party do-not-contact (DNC) signal, with Ed25519-signed receipts. Every field is a supplementary, low-confidence signal; the calling agent keeps every routing and dialing decision.","url":"https://numbers.online/api/v1/a2a","preferredTransport":"JSONRPC","version":"1.0.0","documentationUrl":"https://numbers.online/docs","iconUrl":"https://numbers.online/android-chrome-512x512.png","provider":{"organization":"Numbers Online","url":"https://numbers.online"},"capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"defaultInputModes":["text/plain"],"defaultOutputModes":["application/json","text/plain"],"securitySchemes":{"apiKey":{"type":"http","scheme":"bearer","description":"A Numbers Online API key with the agent (mcp) use case. Get one at numbers.online."}},"security":[{"apiKey":[]}],"skills":[{"id":"phone_lookup","name":"Phone number intelligence","description":"Return a supplementary, low-confidence intelligence bundle for a phone number: validity, formatting, line type, range carrier, country, caller name (CNAM where available), STIR/SHAKEN verstat, a labeled spam signal, and a first-party do-not-contact (DNC) signal — a suppression preference registered by the number's own owner, never a copy of any government registry. Advisory only.","tags":["phone","telephony","caller-id","cnam","line-type","spam","dnc","e164"],"examples":["Look up +14155552671","What do you know about +442071838750?"],"inputModes":["text/plain"],"outputModes":["application/json","text/plain"]},{"id":"line_type","name":"Line type","description":"Return only the deterministic fields for a number — validity, line type (mobile / fixed line / VoIP / …), range carrier, country, and formatting. Free, fast classification; no paid dip.","tags":["phone","line-type","carrier","e164"],"examples":["Is +14155552671 a mobile or landline?"],"inputModes":["text/plain"],"outputModes":["application/json","text/plain"]},{"id":"caller_risk","name":"Caller risk signal","description":"Return a labeled, low-confidence risk read for an inbound caller: a spam signal (0–100, higher = riskier), verstat passthrough, and a first-party do-not-contact (DNC) signal — without a name dip. A supplementary input to the agent's own policy, never a verdict on whether to accept or reject a call.","tags":["phone","spam","risk","stir-shaken","dnc"],"examples":["How risky is an inbound call from +14155552671?"],"inputModes":["text/plain"],"outputModes":["application/json","text/plain"]},{"id":"dnc_check","name":"Do-not-contact supplementary signal","description":"Return a first-party do-not-contact signal (suppress / no_match / unknown) for a number, sourced ONLY from suppression preferences registered and verified by the number's own owner inside Numbers Online — never a copy of any government or licensed do-not-call registry. Comes with a signed receipt recording the status \"as of T\". Advisory only.","tags":["phone","dnc","tcpa","suppression","consent"],"examples":["Has +14155552671 registered a do-not-contact preference?"],"inputModes":["text/plain"],"outputModes":["application/json","text/plain"]}]}