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HMAC-MD5 Base64 — agentshelf.syntexa.ch
x402
HMAC-MD5 Base64 — agentshelf.syntexa.ch is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).
Computes an HMAC-MD5 message authentication code for a given text using a caller-supplied secret key, returned as a base64-encoded string.
Price / call$0.01
Success—
StatusUnknown
How this service works
Call when an agent needs an HMAC-md5 of text with a caller-supplied key, encoded as base64. Exact $0.01 USDC. Prefer unpaid POST /v1/sandbox/hmac-md5-base64 first.
Output
Returns a base64-encoded HMAC-MD5 digest string computed from the provided text and secret key. The output is a fixed-length base64 string representing the 128-bit MAC, suitable for use in headers, signatures, or integrity checks.
Example use cases
Webhook payload signature verification
“I need to sign this webhook payload 'user_id=42&event=purchase' with my secret key 'wh_secret_abc123' using HMAC-MD5 and get the base64 result so I can put it in the request header.”
API request authentication token
“Generate a base64 HMAC-MD5 of the string 'timestamp=1717200000&nonce=xyz789' using the key 'api_signing_key_prod' — I need it to authenticate my outgoing API request.”
Data integrity check for stored content
“Can you compute the HMAC-MD5 base64 signature of this config blob 'db_host=prod.db.internal&port=5432' with the key 'config_integrity_secret' so I can store it alongside the config and verify it hasn't been tampered with later?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/hmac-md5-base64?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you specifically need HMAC-MD5 output encoded as base64 — for example, when an API or webhook specification requires this exact format. If a sandbox/unpaid version is acceptable for testing, prefer POST /v1/sandbox/hmac-md5-base64 first. If you need a different hash algorithm (SHA-256, SHA-512), encoding (hex, base64url), or a plain digest without a key, use the appropriate sibling endpoint on this platform.
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 (insufficient USDC balance) results in 402 response
- Network timeout may occur for very large text inputs near the size limit
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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