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AgentResolver HMAC-SHA256 Signing
x402
AgentResolver HMAC-SHA256 Signing is a paid API for AI agents from agentresolver.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-18).
Computes an HMAC-SHA256 message authentication code for a given input string using a secret key
Price / call$0.001
Success—
StatusUnknown
How this service works
Verify an x402 endpoint before paying: live payTo, USDC quote, network, asset, resource binding, TLS and endpoint safety for $0.001 on Base or Solana.
Output
Returns a JSON object containing the HMAC-SHA256 result string (typically hex-encoded), the encoding format used, the operation name ('hmac-sha256'), and the byte count of the input string.
Example use cases
Webhook payload signature verification
“Sign the string 'user_id=42&event=purchase×tamp=1700000000' with my secret key 'sk_prod_abc123' using HMAC-SHA256 so I can compare it against the signature header from the incoming webhook.”
API request authentication token
“I need to create an HMAC-SHA256 signature for the request body 'GET /api/orders/99' using the secret 'api-secret-xyz' to include in the Authorization header.”
Data integrity check for stored records
“Generate an HMAC-SHA256 digest for the string 'invoice:8821,total:540.00,currency:USD' with the secret 'integrity-key-2024' so I can store it alongside the record and detect tampering later.”
Technical details
Endpoint
POSThttps://agentresolver.vercel.app/api/hmac-sha256When to prefer
Use this endpoint when you need a simple, pay-per-use HMAC-SHA256 computation without setting up a cryptographic library locally, or when running in an environment where native crypto is unavailable. It is ideal for lightweight agent workflows that occasionally need to sign payloads or verify data integrity without bundling crypto dependencies.
Side effects
- Missing required field 'input' or 'secret' returns a 400 or validation error
- Empty string inputs may produce unexpected or zero-length results
- Invalid JSON body causes a parse error
- Payment not provided or insufficient results in a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | |
| secret | string |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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