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Hash + HMAC
x402
Hash + HMAC is a paid API for AI agents from payanagent.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes cryptographic hash digests (MD5, SHA-1, SHA-256, SHA-384, SHA-512) or HMACs with an optional key, returning output in hex, base64, or base64url encoding.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compute cryptographic digests and HMACs deterministically: MD5, SHA-1, SHA-256, SHA-384, SHA-512, output as hex, base64, or base64url. Add a "key" for HMAC. Built for checksums, content addressing, and signature verification. Inputs are hashed and discarded. POST a JSON body like: {"text":"hello world","algorithm":"sha256","encoding":"hex"}
Output
Returns the computed hash or HMAC as a string in the requested encoding (hex, base64, or base64url). The input text is not stored or logged. The response is deterministic — identical inputs always yield identical outputs.
Example use cases
Webhook signature verification
“I need to verify a webhook payload — compute an HMAC-SHA256 of the request body 'payload=abc123' using my secret key 'mysecretkey' and return it as hex so I can compare it to the signature header.”
Content-addressable cache key
“Generate a SHA-256 hash of this string 'user_id:42:profile:v3' encoded as base64url so I can use it as a cache key.”
Legacy MD5 checksum for compatibility
“I need an MD5 digest of the text 'document content here' in base64 encoding for a legacy system that requires it.”
Technical details
Endpoint
POSThttps://payanagent.com/x402/kh737f5q658r7gq9t3x0fyk1nh8ac3hvWhen to prefer
Choose this endpoint when you need a simple, deterministic, server-side cryptographic hash or HMAC without setting up local crypto libraries — especially in agent pipelines that already use x402 micropayments and need consistent output encoding options (hex, base64, base64url). Useful when the agent runtime doesn't have native crypto access or when you want a neutral third-party to perform the hash.
Side effects
- Unsupported algorithm value returns a validation error
- Unsupported encoding value returns a validation error
- Missing 'text' field may return an error or empty digest
- Very large text inputs may time out or be rejected
- Payment failure (402) if USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | If present, compute HMAC-<algorithm> with this key instead of a plain hash. |
| text | string | The data to hash. |
| encoding | string | |
| algorithm | string |
Tags
x402
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