Swift Bot Labs Toolbox – HMAC Signature Generator

x402

Swift Bot Labs Toolbox – HMAC Signature Generator is a paid API for AI agents from x402-toolbox.swiftbotlab.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).

Computes an HMAC signature for a message using a secret key and optionally verifies it against an expected signature, returning hex and base64 encodings.

Price / call$0.003

Seller volume →—

Success—

StatusUnknown

How this service works

62 small, deterministic utility APIs (DNS and e-mail checks, web extraction, EVM decoding, x402 checks, IP math, JSON/CSV, hashing, conversions). No account or API key: pay per call in USDC with x402.

Output

A JSON object with ok:true, the tool name, and a result containing the HMAC as both a hex string and a base64 string, the algorithm used, and a 'matches' boolean (true/false if an expected signature was provided for comparison, null otherwise).

Example use cases

Webhook signature verification

“I just received a webhook from Stripe with a signature header. Can you verify that the HMAC-SHA256 of the raw payload 'amount=500&currency=usd' using my signing secret 'whsec_abc123' matches the expected signature '6f0c0b5bdeadbeef'?”

API request signing

“Sign the string 'GET /api/orders/42 1712345678' with my API secret key 'supersecretkey' using HMAC-SHA512 and give me the hex digest I should attach to the request.”

Legacy HMAC-SHA1 for OAuth

“I need an HMAC-SHA1 signature for my OAuth 1.0 request. The base string is 'POST&https%3A%2F%2Fapi.example.com%2Ftweet&...' and the signing key is 'consumerSecret&tokenSecret' — can you compute it and return the base64 value?”

Technical details

Endpoint

POSThttps://x402-toolbox.swiftbotlab.workers.dev/v1/hmac?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a quick, serverless, no-account HMAC computation or verification without standing up your own crypto infrastructure. Ideal for agents that need to sign payloads or verify webhook authenticity on demand, especially in x402 pay-per-call pipelines where persistent credentials are undesirable. Prefer over rolling your own crypto when auditability of the exact algorithm and encoding is important.

Side effects

Missing required 'key' or 'message' fields returns a validation error
Invalid algorithm value (not sha1/sha256/sha384/sha512/md5) returns an error
Key or message exceeding max length (4096 / 1MB) may be rejected
Payment failure via x402 protocol returns 402 before processing
Malformed expected signature (invalid hex or base64) may cause comparison to return false rather than error

Input

Schema · Request body

Field	Type	Description
key	string
message	string
expected	string	Optional signature to compare (hex or base64, optional "sha256=" prefix)
algorithm	string
keyEncoding	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "tool": "hmac",
    "result": {
      "hex": "6f0c0b5b...",
      "base64": "bwwLW...",
      "matches": null,
      "algorithm": "sha256"
    }
  }
}

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