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 HTTP endpoint POST /api/tools/password-breach-checker/execute. See the MCP 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 REST

POST https://api.findutils.com/api/tools/password-breach-checker/execute · no API keys · 60 requests/min per IP

Execute — verified arguments

curl -X POST https://api.findutils.com/api/tools/password-breach-checker/execute \
  -H "Content-Type: application/json" \
  -d '{
    "password": "password"
  }'

Parameter schema for this endpoint

curl https://api.findutils.com/api/tools/password-breach-checker

Interactive docs · OpenAPI 3.1 spec · All REST tools

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 an MCP tool

Claude, Cursor, and any MCP client can call this tool as findutils:password_breach_checker after one connect command.

Connect once

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

Open the MCP reference for Password Breach Checker →

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