MCP server · Numbers Online

numbers-online-mcp.yml

Numbers Online operates ONE hosted, stateless, read-only MCP server at POST https://numbers.online/api/v1/mcp (JSON-RPC 2.0 over Streamable HTTP; the provider and Vapi call the transport literal "shttp"). Anonymous initialize and tools/list succeed (200); tools/call is fail-closed behind an API key with the mcp use case. GET returns 405 (response-only, no server-initiated SSE). Nothing to install: the provider ships no stdio package.

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Provider: Numbers Online Type: Documentation link Transport: Host: numbers.online

Documentation

https://numbers.online/docs/integrations/ai-voice-agents-mcp

Documentation link · transport

Tools

phone_lookup — 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 (supply the call's verstat
line_type — Return only the deterministic fields for a number
caller_risk — 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
dnc_check — 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

About MCP

The Model Context Protocol (MCP) is an open protocol Anthropic introduced for connecting LLM-based agents to external tools and data sources. Providers publish MCP servers that expose their API surface as structured, discoverable tools — an MCP-compatible client (Claude Desktop, Cursor, Cline, Continue, etc.) can connect to the server and call its tools without any per-provider integration code.

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