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HMAC-SHA3-512 Base64 Generator
x402
HMAC-SHA3-512 Base64 Generator is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.007/call, status unknown (last checked 2026-10-02).
Computes an HMAC-SHA3-512 digest of a given text using a caller-supplied key, returning the result as a base64-encoded string.
Price / call$0.007
Success—
StatusUnknown
How this service works
Call when an agent needs an HMAC-sha3-512 of text with a caller-supplied key, encoded as base64. Exact $0.007 USDC. Prefer unpaid POST /v1/sandbox/hmac-sha3-512-base64 first.
Output
A base64-encoded string representing the HMAC-SHA3-512 digest of the provided text computed with the given key. The response is a deterministic cryptographic authentication code that can be used for message integrity verification or authentication.
Example use cases
Webhook payload integrity signing
“I need to sign this webhook payload 'user_id=42&event=purchase' with HMAC-SHA3-512 using my secret key 'wh_secret_abc' and get the base64 result to include in the request header.”
API request authentication token
“Generate an HMAC-SHA3-512 signature for the string 'GET /api/orders/2024-06-01' using the secret key 'api_signing_key_xyz' and encode it as base64 so I can authenticate my API call.”
Data integrity verification code
“Can you create an HMAC-SHA3-512 digest in base64 for the message 'transaction:TXN-998877-amount:250.00-currency:USD' using the key 'integrity_check_secret' so I can verify this data hasn't been tampered with?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/hmac-sha3-512-base64?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need HMAC with the SHA3-512 algorithm (not SHA2) with base64 encoding output. Prefer this over SHA2-based HMAC endpoints when stronger collision resistance of the SHA3/Keccak family is required. Use the sandbox endpoint (POST /v1/sandbox/hmac-sha3-512-base64) first for testing to avoid the $0.007 USDC charge per call.
Side effects
- Missing or empty key field returns a validation error
- Missing or empty text field returns a validation error
- Text exceeding 100,000 characters is rejected
- Key exceeding 512 characters is rejected
- Payment failure results in 402 response — use sandbox endpoint for testing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored. |
| text | string | Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text. |
Tags
x402
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