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Password Breach Check (k-Anonymity)
x402
Password Breach Check (k-Anonymity) is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Checks whether a password, SHA-1 hash, or NTLM hash has appeared in known data breaches using k-anonymity, returning a compromised flag and breach count without ever transmitting the plaintext.
Price / call$0.003
Success—
StatusUnknown
How this service works
Check whether a password has appeared in known data breaches, using k-anonymity: the password is hashed locally and only a 5-character hash prefix is sent upstream, so the plaintext is never transmitted, logged or stored. Accepts a password, a SHA-1 hash or an NTLM hash. Returns compromised, breach_count and the hash prefix. Credential-exposure indicators, not a guarantee.
Output
Returns a JSON object with a 'compromised' boolean indicating whether the input appeared in known breach data, a 'breach_count' integer showing how many times it was found, and the 'hash_prefix' (first 5 characters of the SHA-1 hash) used for the k-anonymity lookup. These are credential-exposure indicators, not a definitive security guarantee.
Example use cases
Password policy enforcement at signup
“When a new user sets their password during registration, check whether 'Spring2024!' has been found in any known data breaches and block it if it's compromised.”
Security audit of employee credentials
“I want to check if the password 'Companyname1' has ever appeared in a breach database — use the k-anonymity approach so the actual password never leaves our system, and tell me the breach count.”
Verifying a known SHA-1 hash from a threat feed
“I have a SHA-1 hash from a threat intelligence feed — '5BAA61E4C9B93F3F0682250B6CF8331B7EE68FD8' — can you check if this password hash shows up in breach data and how many times it's been seen?”
Technical details
Endpoint
POSThttps://api.agentstools.dev/breach/passwordWhen to prefer
Choose this endpoint when you need a privacy-preserving credential breach check that uses k-anonymity so the plaintext password is never transmitted. It is ideal for agents enforcing password policies at sign-up, auditing credentials, or integrating breach-check into security workflows without the risk of exposing sensitive credentials to a third-party server. Prefer it over raw HIBP API calls when you want a simple, pre-packaged, agent-friendly interface with structured output including compromised status and breach count.
Side effects
- Invalid or malformed hash format (not 40-hex for SHA-1 or 32-hex for NTLM) may return a validation error
- Missing required 'input' body fields returns a 400 bad request
- Network or upstream breach database unavailability may cause timeouts or 503 errors
- NTLM hash corpus is separate and may have different coverage than SHA-1 corpus
- A result of compromised=false does not guarantee the password is safe, only that it wasn't found in the indexed breaches
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| ntlm | string | Alternative input: a full 32-hex NTLM hash (MD4 cannot be computed here, so send the hash for the NTLM corpus) |
| sha1 | string | Alternative input: a full 40-hex SHA-1 hash of the password (so the plaintext never leaves your side) |
| password | string | Plaintext password — hashed locally with SHA-1; never stored, logged or transmitted |
Tags
x402
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