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ShieldAPI Password Breach Check
x402
ShieldAPI Password Breach Check is a paid API for AI agents from shield.vainplex.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Checks a SHA-1 password hash against 900M+ breach records to determine if a password has been compromised
Price / call$0.001
Success—
StatusUnknown
How this service works
Check password hash against 900M+ breach records
Output
Returns whether the SHA-1 hash of the password appears in the breach database of 900M+ records, typically including a breach count or exposure flag indicating how many times the password was found in known data breaches.
Example use cases
Validate user passwords during registration
“I'm building a sign-up flow and want to warn users if their chosen password has shown up in known breaches — can you check if this SHA-1 hash is in your database: e5fa44f2b31c1fb553b6021e7aab6b74e5fa44f2?”
Screen employee credentials for IT security
“Our IT team is doing a security audit and needs to verify that employee passwords haven't been compromised in past incidents. Can you tell me if this SHA-1 hash has been exposed: 7c4a8d09ca3762af61e59520943dc26494f8941b?”
Detect compromised passwords in user accounts
“A user just changed their password to something new — I want to make sure they're not using a password that's already been leaked. Can you check this SHA-1 hash against your breach records: 2c26b46911185131006ba32006b47e39fc1db128?”
Technical details
Endpoint
GEThttps://shield.vainplex.dev/api/check-passwordWhen to prefer
Use this endpoint when you need a full exact-match breach check against a complete SHA-1 hash and are willing to pay $0.001 USDC per call. Prefer the sibling k-Anonymity range lookup endpoint when you want to avoid sending the full hash for privacy reasons (HIBP-compatible partial hash model). Use this endpoint when you need a definitive, full-hash confirmation of breach exposure.
Side effects
- Invalid hash format (not 40 hex characters) — returns 400 bad request
- Hash not found in database — returns clean/safe result
- Network timeout or service unavailability — returns 5xx error
- Payment not completed (x402) — returns 402 Payment Required
- Demo mode limits results or truncates breach count
Input
{
"demo": true,
"hash": "da39a3ee5e6b4b0d3255bfef95601890afd80709"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | — |
Output
{
"mode": "demo",
"note": "This is demo data. The password \"password\" has been seen ~3.8M times in breaches.",
"count": 3861493,
"found": true,
"prefix": "5BAA6"
}Tags
x402
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