Relaystation HMAC Compute

x402

Relaystation HMAC Compute is a paid API for AI agents from api.relaystation.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Computes a keyed HMAC digest (SHA-256, SHA-512, SHA-1, or MD5) from a secret key and data payload, without logging the key.

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

$0.0002/MB. Compute a keyed HMAC (SHA-256/512/1, MD5) — the key is never logged. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny

Output

Returns a JSON object containing the algorithm name used and the computed HMAC as a lowercase hex string. Example: {"algo": "sha256", "hmac": "d889c99fa478f0ca3ff868a586062f7f9a36031c61fa36c7128a4d8f853ce8f0"}. The secret key is never logged or retained.

Example use cases

Webhook signature verification

“I need to sign the webhook payload '{"event":"payment.completed","amount":50}' with HMAC-SHA256 using my secret 'wh-secret-abc123' so I can attach it to the outgoing request header.”

API request authentication

“Generate an HMAC-SHA512 digest for the string 'GET /api/orders/789 timestamp=1720000000' using the key 'api-key-secret-xyz' so I can authenticate the request to our partner's API.”

Data integrity checksum

“Create a keyed MD5 HMAC for the text 'user-export-2024-07-01.csv' with the secret 'integrity-check-key' so I can verify this file hasn't been tampered with later.”

Technical details

Endpoint

POSThttps://api.relaystation.ai/v1/utils/hmac

When to prefer

Choose this endpoint when you need a quick, serverless, keyed HMAC computation without setting up cryptographic libraries or infrastructure, especially when your runtime environment lacks native crypto support. Ideal for agents that need to sign webhook payloads, authenticate API requests, or verify data integrity on the fly. The key-never-logged guarantee makes it suitable for sensitive secrets that must not appear in server logs.

Side effects

Unsupported algorithm value returns an error — must be sha256, sha512, sha1, or md5
Missing key or data fields cause a 400 bad request
Empty string for key or data may produce unexpected but valid HMAC output
Payment failure (insufficient x402 credits) blocks the request before computation

Input

{
  "input": {
    "body": {
      "key": "test-secret-key-12345",
      "algo": "sha256",
      "data": "test-data-to-hash"
    },
    "type": "http",
    "method": "POST",
    "bodyType": "json"
  }
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "algo": "sha256",
  "hmac": "d889c99fa478f0ca3ff868a586062f7f9a36031c61fa36c7128a4d8f853ce8f0"
}

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How this service works

$0.0002/MB. Compute a keyed HMAC (SHA-256/512/1, MD5) — the key is never logged. 1¢ x402 min; remainder auto-credits — relaystation.ai/penny

Output

Example use cases

Webhook signature verification

“I need to sign the webhook payload '{"event":"payment.completed","amount":50}' with HMAC-SHA256 using my secret 'wh-secret-abc123' so I can attach it to the outgoing request header.”

API request authentication

“Generate an HMAC-SHA512 digest for the string 'GET /api/orders/789 timestamp=1720000000' using the key 'api-key-secret-xyz' so I can authenticate the request to our partner's API.”

Data integrity checksum

“Create a keyed MD5 HMAC for the text 'user-export-2024-07-01.csv' with the secret 'integrity-check-key' so I can verify this file hasn't been tampered with later.”

Technical details

Endpoint

POSThttps://api.relaystation.ai/v1/utils/hmac

When to prefer

Side effects

Unsupported algorithm value returns an error — must be sha256, sha512, sha1, or md5
Missing key or data fields cause a 400 bad request
Empty string for key or data may produce unexpected but valid HMAC output
Payment failure (insufficient x402 credits) blocks the request before computation

Input

{
  "input": {
    "body": {
      "key": "test-secret-key-12345",
      "algo": "sha256",
      "data": "test-data-to-hash"
    },
    "type": "http",
    "method": "POST",
    "bodyType": "json"
  }
}

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

{
  "algo": "sha256",
  "hmac": "d889c99fa478f0ca3ff868a586062f7f9a36031c61fa36c7128a4d8f853ce8f0"
}