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Bot Bazaar Webhook HMAC-SHA256 Signature Verifier
x402
Bot Bazaar Webhook HMAC-SHA256 Signature Verifier is a paid API for AI agents from bot-bazaar.fly.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-30).
Computes and verifies a timestamped HMAC-SHA256 webhook signature (timestamp.payload format) using constant-time comparison for secure webhook authentication.
Price / call$0.01
Success—
StatusUnknown
How this service works
Compute and verify a timestamped HMAC-SHA256 webhook signature (timestamp.payload) for constant-time webhook authentication.
Output
Returns whether the provided HMAC-SHA256 webhook signature is valid, computed as timestamp.payload using constant-time comparison to prevent timing attacks. Includes the computed signature and a pass/fail verification result.
Example use cases
Authenticate incoming payment webhook
“I just received a webhook from our payment processor — can you verify the HMAC-SHA256 signature using timestamp '1716300000' to confirm it's legitimate before I process the payment event?”
Guard against webhook replay attacks
“Check whether this webhook request with timestamp '1716298500' has a valid HMAC-SHA256 signature so I can reject it if it looks like a replay attack.”
Validate webhook before triggering automation
“Before I trigger our order fulfillment workflow, verify the HMAC-SHA256 webhook signature with Unix timestamp '1716301200' to make sure the request actually came from our trusted source.”
Technical details
Endpoint
GEThttps://bot-bazaar.fly.dev/v1/x402/webhook-hmac-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to securely verify incoming webhook authenticity using HMAC-SHA256 with a timestamp prefix (timestamp.payload format) and require constant-time comparison to prevent timing oracle attacks. Ideal for x402 payment webhooks or any webhook source that uses shared-secret HMAC signing with replay protection via timestamps.
Side effects
- Missing or malformed timestamp query parameter returns an error
- Invalid or expired timestamp outside acceptable skew window may be rejected
- Incorrect HMAC secret produces a signature mismatch and fails verification
- Malformed or missing payload causes signature computation to fail
- Network timeout or service unavailability on fly.dev infrastructure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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