# Numbers Online MCP Server

**Canonical:** https://apis.io/apis/numbers-online/numbers-online-mcp-server/  
**Provider:** Numbers Online — https://apis.io/providers/numbers-online/  
**Base URL:** https://numbers.online/api/v1/mcp  
**Documentation:** https://numbers.online/docs/integrations/ai-voice-agents-mcp

Numbers Online MCP Server is one of 3 APIs that [Numbers Online](https://apis.io/providers/numbers-online/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include MCP, agent-native, and Phone Intelligence. The published artifact set on APIs.io includes API documentation, a GitHub repository, authentication docs, and rate-limit docs.

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.

## Machine-readable artifacts (9)

- **MCPServer** — https://raw.githubusercontent.com/api-evangelist/numbers-online/refs/heads/main/mcp/numbers-online-mcp.yml
- **MCPServer** — https://numbers.online/api/v1/mcp
- **Documentation** — https://numbers.online/docs/integrations/ai-voice-agents-mcp
- **ToolCrosswalk** — https://raw.githubusercontent.com/api-evangelist/numbers-online/refs/heads/main/mcp/numbers-online-tool-crosswalk.yml
- **GitHubRepository** — https://github.com/numbers-online/numbers-online-mcp
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/numbers-online/refs/heads/main/authentication/numbers-online-authentication.yml
- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/numbers-online/refs/heads/main/a2a/numbers-online-a2a.yml
- **RateLimits** — https://raw.githubusercontent.com/api-evangelist/numbers-online/refs/heads/main/rate-limits/numbers-online-rate-limits.yml
- **Plans** — https://raw.githubusercontent.com/api-evangelist/numbers-online/refs/heads/main/plans/numbers-online-plans-pricing.yml

## Other Numbers Online APIs (2)

- [Numbers Online Phone Intelligence API](https://apis.io/apis/numbers-online/numbers-online-phone-intelligence-api/)
- [Numbers Online A2A Agent](https://apis.io/apis/numbers-online/numbers-online-a2a-agent/)

## Tags

MCP, agent-native, Phone Intelligence

---

Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/numbers-online/numbers-online-mcp-server/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/numbers-online/.