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Constant-Time String Comparison
x402
Constant-Time String Comparison is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Compares two strings in constant time using cryptographic timing-safe equality to prevent timing side-channel attacks, returning equality status and length match.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compare two strings in constant time using node:crypto timingSafeEqual, preventing timing side-channel attacks. Returns whether the strings are equal and whether their lengths match. Different-length strings are always unequal but comparison does ...
Output
Returns a JSON object indicating whether the two strings are equal (boolean) and whether their lengths match (boolean). Different-length strings are always reported as unequal, but the comparison still runs in constant time to avoid leaking length information.
Example use cases
Example prompt
“Do a timing-safe constant-time comparison of these two strings to check if they're equal without leaking timing info: 'abc123secrettoken' and 'abc123secrettoken'.”
Technical details
Endpoint
POSThttps://agent402.tools/api/constant-compareWhen to prefer
Use this endpoint when you need to securely compare two strings — such as API keys, HMAC signatures, tokens, or passwords — in a way that prevents timing side-channel attacks. Prefer this over naive string equality checks whenever security is a concern and you cannot run server-side crypto locally.
Side effects
- Missing required field 'a' or 'b' results in a 400 error
- Non-string inputs may cause schema validation errors
- Network timeout on slow connections
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| a | string | First string to compare |
| b | string | Second string to compare |
Output
Schema · Response
{
"type": "json",
"example": {
"equal": false,
"lengthMatch": false
}
}Tags
x402
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