Numbers Online

Numbers Online MCP Server

A hosted, stateless, read-only Model Context Protocol server (JSON-RPC 2.0 over Streamable HTTP, protocol 2025-06-18) at POST https://numbers.online/api/v1/mcp for AI voice agents (Vapi, Retell, Pipecat, LiveKit). initialize, ping and tools/list are public; tools/call requires an API key with the mcp use case. Live tools/list returns phone_lookup, line_type, caller_risk and dnc_check, each annotated readOnlyHint/idempotentHint. Every output is a supplementary, low-confidence signal; the calling agent keeps every routing and dialing decision. Billed $0.015 per tool call on the standard tier.

Documentation GitHub

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this

find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/numbers-online-mcp-server"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

API entry from apis.yml

aid: numbers-online:numbers-online-mcp-server
name: Numbers Online MCP Server
description: A hosted, stateless, read-only Model Context Protocol server (JSON-RPC 2.0 over Streamable
  HTTP, protocol 2025-06-18) at POST https://numbers.online/api/v1/mcp for AI voice agents (Vapi, Retell,
  Pipecat, LiveKit). initialize, ping and tools/list are public; tools/call requires an API key with the
  mcp use case. Live tools/list returns phone_lookup, line_type, caller_risk and dnc_check, each annotated
  readOnlyHint/idempotentHint. Every output is a supplementary, low-confidence signal; the calling agent
  keeps every routing and dialing decision. Billed $0.015 per tool call on the standard tier.
image: https://numbers.online/android-chrome-512x512.png
humanURL: https://numbers.online/docs/integrations/ai-voice-agents-mcp
baseURL: https://numbers.online/api/v1/mcp
tags:
- MCP
- agent-native
- Phone Intelligence
properties:
- type: MCPServer
  url: mcp/numbers-online-mcp.yml
- type: MCPServer
  url: https://numbers.online/api/v1/mcp
- type: Documentation
  url: https://numbers.online/docs/integrations/ai-voice-agents-mcp
- type: ToolCrosswalk
  url: mcp/numbers-online-tool-crosswalk.yml
- type: GitHubRepository
  url: https://github.com/numbers-online/numbers-online-mcp
- type: Authentication
  url: authentication/numbers-online-authentication.yml
- type: AgentCard
  url: a2a/numbers-online-a2a.yml
- type: RateLimits
  url: rate-limits/numbers-online-rate-limits.yml
- type: Plans
  url: plans/numbers-online-plans-pricing.yml