ShieldAPI k-Anonymity Password Range Lookup

x402

ShieldAPI k-Anonymity Password Range Lookup 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 prefix against a breach database using k-anonymity, returning matching hash suffixes and breach counts (HIBP-compatible)

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

k-Anonymity password range lookup (HIBP compatible)

Output

Returns a list of SHA-1 hash suffixes that match the submitted prefix, each paired with a count indicating how many times that password hash appeared across known breach datasets, allowing the caller to check locally whether their specific full hash is in the list without exposing it.

Example use cases

Example prompt

“Can you check if the password 'Summer2024!' has appeared in any known data breaches — use the k-anonymity hash range method so the actual password stays private?”

Technical details

Endpoint

GEThttps://shield.vainplex.dev/api/check-password-range

When to prefer

Use this endpoint when you need to check password exposure in a privacy-preserving way using the k-anonymity model — ideal for credential validation flows, security audits, or user onboarding checks where you cannot send the full password hash to a remote server. Prefer this over a full-hash lookup when privacy is paramount. It is HIBP-compatible, so existing tooling that works with HIBP range responses will work here.

Side effects

Missing or too-short prefix (fewer than 5 hex characters) returns a 400 error
Invalid non-hex characters in prefix cause a validation error
Payment not provided or insufficient USDC triggers a 402 Payment Required response
Service unavailable or upstream breach database unreachable returns 5xx
Demo mode may return limited or synthetic data not representative of full dataset

Input

{
  "demo": true,
  "prefix": "5BAA61"
}

Schema · Request body

Field	Type	Description
input	—

Output

{
  "mode": "demo",
  "note": "This is demo data showing k-Anonymity range results.",
  "prefix": "5BAA6",
  "results": [
    {
      "count": 3861493,
      "suffix": "1E4C9B93F3F0682250B6CF8331B7EE68FD8"
    },
    {
      "count": 12,
      "suffix": "2B5B5F5A7EC0A94A52F84AEF3E57EDA3ED3"
    },
    {
      "count": 3,
      "suffix": "3A179A2B58A0FE3D462C8E6B82FEF3BD7B6"
    }
  ],
  "total_matches": 526
}

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How this service works

k-Anonymity password range lookup (HIBP compatible)

Output

Technical details

Endpoint

GEThttps://shield.vainplex.dev/api/check-password-range

When to prefer

Side effects

Missing or too-short prefix (fewer than 5 hex characters) returns a 400 error
Invalid non-hex characters in prefix cause a validation error
Payment not provided or insufficient USDC triggers a 402 Payment Required response
Service unavailable or upstream breach database unreachable returns 5xx
Demo mode may return limited or synthetic data not representative of full dataset

Input

{
  "demo": true,
  "prefix": "5BAA61"
}

Schema · Request body

Field	Type	Description
input	—

Output

{
  "mode": "demo",
  "note": "This is demo data showing k-Anonymity range results.",
  "prefix": "5BAA6",
  "results": [
    {
      "count": 3861493,
      "suffix": "1E4C9B93F3F0682250B6CF8331B7EE68FD8"
    },
    {
      "count": 12,
      "suffix": "2B5B5F5A7EC0A94A52F84AEF3E57EDA3ED3"
    },
    {
      "count": 3,
      "suffix": "3A179A2B58A0FE3D462C8E6B82FEF3BD7B6"
    }
  ],
  "total_matches": 526
}