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agent402.tools Webhook Debug
x402
agent402.tools Webhook Debug is a paid API for AI agents from agent402.tools, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Validates an inbound webhook by pretty-printing its payload, decoding any JWT auth header, and verifying the HMAC signature against the raw body
Price / call$0.05
Success—
StatusUnknown
How this service works
Bundled execution of the Webhook debug workflow - A webhook hit your endpoint and you need to confirm it's authentic, valid, and safe to log. Pretty-print the payload, decode any JWT auth header, verify the HMAC signature against the raw body, sch...
Output
Returns a structured response containing the pretty-printed webhook payload, the decoded JWT (if present in the auth header), the HMAC signature verification result (valid/invalid), and an overall assessment of whether the webhook is authentic and safe to process.
Example use cases
Example prompt
“I just received a webhook from our payment provider — the raw body is '{"event":"payment.completed","id":"evt_123"}' and the signing secret from the dashboard is 'whsec_abc123xyz'. Can you verify the HMAC signature, decode the JWT auth header, and confirm it's safe and authentic?”
Technical details
Endpoint
POSThttps://agent402.tools/api/skill/webhook-debugWhen to prefer
Use this endpoint when you need a bundled, one-call solution to fully authenticate and inspect an inbound webhook — combining HMAC verification, JWT decoding, and payload pretty-printing in a single request. Prefer this over building your own validation pipeline when speed and reliability matter more than customization.
Side effects
- Invalid or malformed raw body JSON — returns parse error
- Missing or incorrect signing secret — HMAC verification fails with mismatch error
- Missing JWT header — JWT decode step is skipped or returns null
- Signature mismatch — returns invalid signature with expected vs received values
- Malformed JWT — returns decode error with details
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| rawBody | string | the raw webhook body as received on the wire (single-line JSON string) |
| signingSecret | string | the shared webhook signing secret from the provider dashboard |
Output
Schema · Response
{
"type": "json",
"example": {
"args": {
"rawBody": "{\"id\":\"evt_3O2eYxL5d8\",\"type\":\"checkout.session.completed\",\"created\":1750982400,\"data\":{\"object\":{\"id\":\"cs_test_a1b2c3\",\"customer_email\":\"alice@example.com\",\"amount_total\":4999,\"client_ip\":\"203.0.113.42\",\"success_url\":\"https://app.example.com/orders/cs_test_a1b2c3\"}}}",
"signingSecret": "whsec_demo_secret_do_not_use"
},
"pack": "webhook-debug",
"steps": [
{
"ok": true,
"slug": "json-format",
"result": {}
},
{
"ok": true,
"slug": "jwt-decode",
"result": {}
},
{
"ok": true,
"slug": "hmac",
"result": {}
},
{
"ok": true,
"slug": "json-validate",
"result": {}
},
{
"ok": true,
"slug": "time-convert",
"result": {}
},
{
"ok": true,
"slug": "redact",
"result": {}
},
{
"ok": true,
"slug": "extract-entities",
"result": {}
}
],
"summary": "7/7 steps succeeded"
}
}Tags
x402
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