HMAC signature

$0.003 per call · failed calls are never charged · no account or API key needed

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.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
message (required)stringThe message
key (required)stringThe key
algorithmstringsha256 (default), sha1, sha384 or sha512

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/hmac?message=hello&key=secret"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/hmac?message=hello&key=secret&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum, Monad, World Chain or Tempo) and retries.

Example result

{
  "algorithm": "sha256",
  "hex": "88aab3ede8d3adf94d26ab90d3bafd4a2083070c3bcce9c014ee04a443847c0b"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is hmac, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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