HMAC Signature Generator

x402

HMAC Signature Generator is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).

Computes an HMAC (Hash-based Message Authentication Code) signature for a given message and key using a specified hashing algorithm (SHA-256, SHA-1, SHA-384, or SHA-512)

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Compute an HMAC of a message with a key using SHA-256 (default), SHA-1, SHA-384 or SHA-512, in hex and base64. Use to check webhook signatures. The key is used only for this call and is not stored.

Output

Returns a JSON object containing 'hex' (the lowercase hexadecimal HMAC digest string) and 'algorithm' (the hashing algorithm used, e.g. 'sha256'). No authentication token or account is required; the call costs $0.001 USDC on Base via x402 and is only charged on success.

Example use cases

Webhook signature verification

“Generate an HMAC-SHA256 signature for the payload 'user_id=42&event=purchase' using the secret 'webhooksecret99' so I can compare it against the X-Signature header from my payment provider.”

API request signing

“I need to sign the string 'GET/api/orders1714000000' with the secret key 'apikey_abc123' using HMAC-SHA512 — what's the hex digest?”

Message authentication code for secure channel

“Produce an HMAC-SHA1 hash of the message 'transfer:500:USD:account9871' using the shared secret 'sharedtokenXYZ' so both sides can confirm the message wasn't tampered with.”

Technical details

Endpoint

GEThttps://agent-data-tools.revmesh2074.workers.dev/hmac?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a quick, no-account, pay-per-call HMAC computation without setting up a crypto library or server-side code. Ideal for AI agents that need to sign a single message on demand, verify webhook authenticity, or produce a keyed digest as part of a larger workflow — especially when already using the Agent Data Tools suite for other operations.

Side effects

Missing 'message' or 'key' query parameters returns an error
Invalid algorithm value (not sha256/sha1/sha384/sha512) may return an error or default to sha256
Payment failure via x402 results in no charge and no response
Network timeout on Cloudflare Worker edge

Input

Schema · Request body

Field	Type	Description
keyrequired	string	The key
messagerequired	string	The message
algorithm	string	sha256 (default), sha1, sha384 or sha512

Output

Schema · Response

Field	Type	Description
hex	string
algorithm	string

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