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Pwned Password Check (k-Anonymity SHA-1)
x402
Pwned Password Check (k-Anonymity SHA-1) is a paid API for AI agents from dev-utils.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-02).
Checks whether a password has appeared in known data breaches using k-anonymity: you send only the first 5 hex chars of its SHA-1 hash, and the service returns a breach count and verdict.
Price / call$0.02
Success—
StatusUnknown
How this service works
Seen in breaches? Send the password's SHA-1 (never the password); only 5 hex chars go upstream. Count and verdict.
Output
Returns a JSON object with: 'found' (boolean indicating breach presence), 'count' (number of times seen in breach data), 'verdict' (short risk label), 'summary' (human-readable explanation), 'source' and 'sourceUrl' (data source attribution), 'hashPrefixSentUpstream' (the 5 hex chars actually transmitted), 'rowsInRange' (how many hashes were in the k-anonymity range), 'asOf' (data freshness timestamp), 'reasons' (list of explanatory strings), 'disclaimer', 'degraded' flag, 'inputMode', and 'notChecked' list if any checks were skipped.
Example use cases
User registration password vetting
“Before I create a new account for this user, check if the password they chose has ever appeared in a known breach — hash it to SHA-1 first and use the k-anonymity check so the plaintext stays local.”
Bulk credential audit for security review
“I'm auditing our internal service accounts. Can you check whether the password 'Adm1nP@ssw0rd' has been seen in any breaches? Use SHA-1 hashing and only send the 5-char prefix upstream.”
Password manager strength warning
“My password manager flagged a password I've been reusing — can you verify if 'hunter2' shows up in breach databases using the safe SHA-1 k-anonymity method, and tell me how many times it's been found?”
Technical details
Endpoint
GEThttps://dev-utils.x402tookit.com/pwned-password?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to check password breach exposure without transmitting the raw password — it implements k-anonymity by design (only 5 hex chars go upstream), making it safe for privacy-sensitive workflows. Prefer it over full-hash or plaintext submission APIs whenever user password privacy is a requirement. Ideal for registration flows, security audits, and password manager integrations where compliance or trust matters.
Side effects
- Invalid or malformed SHA-1 hash (not 40 hex characters) returns an error
- Non-hex characters in the sha1 query param cause a bad request
- Upstream breach database unavailable may return degraded=true or an error
- Missing required sha1 query parameter returns a validation error
- Rate limiting or payment failure returns 402 or 429 responses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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