Password Breach Checker

Security REST API MCP network tool

Return whether a password appears in known data breaches and how many times, using the Have I Been Pwned k-anonymity range API. Only the first 5 characters of the SHA-1 hash are sent upstream.

This page documents the MCP tool findutils:password_breach_checker. See the REST reference →

This tool fetches a fixed, hard-coded public upstream — never a private host. Results depend on that upstream.

Use in the browser View as Markdown

Call it over MCP

Tool name findutils:password_breach_checker · no API keys · 120 requests/min per IP

Claude Code

claude mcp add findutils --transport http https://mcp.findutils.com/

Claude Desktop — claude_desktop_config.json

{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}

Raw JSON-RPC (any MCP client) — verified example

curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "password_breach_checker",
      "arguments": {
        "password": "password"
      }
    }
  }'

Input schema

Argument	Type	Required	Description
password	string	yes	The password to check. It is hashed locally and never transmitted.

Example arguments (verified)

{
  "password": "password"
}

Also a REST endpoint

The same tool answers plain HTTP at POST /api/tools/password-breach-checker/execute — no key, 60 requests/min.

Open the REST reference for Password Breach Checker →

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