1Lookup MCP Server

by 1lookup Your server? Claim it

answering

1Lookup is answering right now. Last checked 1 min ago.

Verify phone numbers, emails and IPs, and check remaining plan credits.

Uptime history 12 days of history

12 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

601 ms

Response time

average over 24h

API key or OAuth

Access

streamable-http

Nothing serious here today

Today is the operative word: we check 1Lookup every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 1 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add 1lookup --transport http https://app.1lookup.io/api/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "1lookup": {
      "url": "https://app.1lookup.io/api/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.1lookup]
url = "https://app.1lookup.io/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "1lookup": {
      "url": "https://app.1lookup.io/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "1lookup": {
      "url": "https://app.1lookup.io/api/mcp"
    }
  }
}

This endpoint answered with an authorization challenge — the server is running, but you need an API key or OAuth to use it.

Endpoints

URL	Transport	State	Latency	Checked
https://app.1lookup.io/api/mcp	streamable-http	needs key	406 ms	1 min ago

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1Lookup — questions

Answers built from our own checks of this server.

Why is there no tool list for 1Lookup?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is 1Lookup working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 601 ms. The bar chart above shows every period we have measured.

How do I connect 1Lookup?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own key or an OAuth login: it refuses anonymous clients.

Does 1Lookup need an API key?

Yes. Every time we knock, 1Lookup answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is 1Lookup?

It answers our handshake in 601 ms on average, which is faster than 26% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.