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ShieldAPI Password Range Check
x402
ShieldAPI Password Range 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 whether a password has appeared in known data breaches using k-anonymity (SHA-1 prefix lookup), without exposing the full password hash
Price / call$0.001
Success—
StatusUnknown
How this service works
ShieldAPI - x402 security preflight before agents accept or store credential material
Output
Returns a list of SHA-1 hash suffixes and their breach occurrence counts for all hashes sharing the given 5-character prefix. The agent can match the remaining hash suffix locally to determine if a specific password has been compromised and how many times it appeared in breached datasets.
Example use cases
Example prompt
“Can you check if the password 'hunter2' has ever appeared in a known data breach? Use the first 5 characters of its SHA-1 hash — that's '5BAA6' — to do the anonymized range lookup so the full hash never gets sent.”
Technical details
Endpoint
GEThttps://shield.vainplex.dev/api/cdp/check-password-rangeWhen to prefer
Use this endpoint when you need to check whether a password has been exposed in known data breaches while preserving user privacy via k-anonymity (only the first 5 characters of the SHA-1 hash are sent). Prefer this over full-hash lookups when privacy is critical. It mirrors the HaveIBeenPwned range API pattern and is ideal for real-time password validation during registration or login flows.
Side effects
- Missing or invalid 'prefix' query parameter — returns 400 or error response
- Prefix not exactly 5 hex characters — malformed request
- Network timeout or service unavailability — returns 5xx
- Payment failure (x402) — returns 402 if USDC payment not processed
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"prefix": "5BAA61"
}
},
"output": {
"type": "string"
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"_truncated": true,
"_originalSize": 115834
}Tags
x402
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