LeakData MCP Server

by leakdatahq Your server? Claim it

answering

LeakData is answering right now. Last checked 6 min ago. It exposes 2 tools.

Check breach exposure for your verified email and check locally computed password hash prefixes.

Uptime history 9 days of history · worst day 43%

9 days agonow

98.9%

Uptime 24h

91 of 92 checks

Tools

read from the server

539 ms

Response time

average over 24h

open, no key

Access

streamable-http

LeakData does not always answer

Over the last week it answered 89.2% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 6 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add leakdata-mcp --transport http https://leakdata.io/mcp

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

{
  "mcpServers": {
    "leakdata-mcp": {
      "url": "https://leakdata.io/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.leakdata-mcp]
url = "https://leakdata.io/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "leakdata-mcp": {
      "url": "https://leakdata.io/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "leakdata-mcp": {
      "url": "https://leakdata.io/mcp"
    }
  }
}

Available tools 2

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

leakdata

leakdata.password_prefix_check

Call this only when the current user message supplies a locally computed five-character SHA-1 hash prefix and asks to check it. Never invent a prefix or reuse one from an earlier message. For general questions about password checks, explain local SHA-1 computation and sharing only its first five hexadecimal characters without calling a tool. Never accept a plaintext password or complete hash. Report only the aggregate values actually returned by this call. Results describe a prefix group only. A matching prefix does not establish whether a particular password is exposed. Do not report confirmed password exposure or recommend changing a password based only on this result. An empty group does not prove that a password is safe.

leakdata.search

Use this when the linked LeakData user asks to check their verified primary email. For a current check, call this tool and report only its returned results. Never present earlier conversation results as a new check; if the call fails, say the check could not be completed. For their own email without an address, set type to email and omit query: the server resolves the verified primary email from the linked account. If the user supplies an email address, preserve it in query for ownership validation. Never guess an email address or recover it from earlier conversations when query can be omitted. Domain checks are not available through this app; explain this without calling a tool. Arbitrary third-party identifiers, usernames, phone numbers, raw leak records, and credentials are not returned.

Endpoints

URL	Transport	State	Latency	Checked
https://leakdata.io/mcp	streamable-http	answering	439 ms	6 min ago

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LeakData — questions

Answers built from our own checks of this server.

What can LeakData do?

It exposes 2 tools, read directly from the server on our last check. Among them: leakdata.password_prefix_check, leakdata.search. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is LeakData working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 92 checks got a reply (98.9%), average response time 539 ms. The bar chart above shows every period we have measured.

How do I connect LeakData?

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.

Does LeakData need an API key?

No. LeakData completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 2 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is LeakData?

It answers our handshake in 539 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.