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HMAC-SHA1 Base64 — agentshelf.syntexa.ch
x402
HMAC-SHA1 Base64 — agentshelf.syntexa.ch is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Computes an HMAC-SHA1 digest of input text using a caller-supplied secret key, returning the result encoded as base64.
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs an HMAC-sha1 of text with a caller-supplied key, encoded as base64. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/hmac-sha1-base64 first.
Output
A JSON response containing the base64-encoded HMAC-SHA1 digest of the provided text, computed using the supplied key. No external network calls or LLM inference are involved — it is a pure cryptographic computation.
Example use cases
Webhook signature verification
“I need to verify a webhook payload — compute the HMAC-SHA1 of the body 'user=alice&event=signup' using secret key 'wh_secret_abc123' and encode it as base64 so I can compare it to the X-Hub-Signature header.”
API request signing
“Sign this API request body '{"action":"transfer","amount":500}' using HMAC-SHA1 with my shared secret 'apiKey9876' and return the base64-encoded signature so I can include it in the Authorization header.”
Data integrity MAC generation
“Generate an HMAC-SHA1 base64 MAC for the string 'invoice_2024_00987' using the key 'billingSecret42' — I need to attach this as a tamper-proof checksum before storing the record.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/hmac-sha1-base64?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when an AI agent needs a deterministic, server-side HMAC-SHA1 base64 computation without executing local code — especially in sandboxed environments where cryptographic libraries are unavailable. It is well-suited for webhook signature generation, API request signing, and data integrity checks. Try the free sandbox endpoint POST /v1/sandbox/hmac-sha1-base64 first; use this paid endpoint when the sandbox is unavailable or rate-limited.
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 returns a payload-too-large error
- Invalid JSON body returns a parse error
- Payment of $0.003 USDC not provided or rejected results in a 402 Payment Required response
- Network timeout if the service is temporarily unavailable
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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