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Webhook Verify

by Webhook signature verify in Security & trust

x402 APIPassing, checked 5 h ago

Verify a webhook's HMAC signature against the correct per-provider scheme: GitHub (X-Hub-Signature-256, sha256=hex), Stripe (Stripe-Signature t/v1 over "<t>.<body>" with replay tolerance), Shopify (X-Shopify-Hmac-Sha256, base64), Slack (X-Slack-Signature, v0:<ts>:<body> with replay tolerance). Constant-time comparison; the secret is never echoed. Pass the RAW request body string - signatures are over the raw bytes. Deterministic.

POST https://agent402.tools/api/webhook-verify

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
192 ms typical, 192 ms slowest 5%
Last check
5 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://agent402.tools/api/webhook-verify" \
  -H "content-type: application/json" \
  -d '{"payload":"{\"hello\":\"world\"}","provider":"github","secret":"it's a secret","signature":"sha256=8d4063f0a81aa1531d9891a028a68cf2bb537ecdf0e82557674d71e168d570f9"}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fwebhook-verify
const res = await pay("https://agent402.tools/api/webhook-verify", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"payload":"{\"hello\":\"world\"}","provider":"github","secret":"it's a secret","signature":"sha256=8d4063f0a81aa1531d9891a028a68cf2bb537ecdf0e82557674d71e168d570f9"}),
});
console.log(await res.json());

Example input

{
  "payload": "{\"hello\":\"world\"}",
  "provider": "github",
  "secret": "it's a secret",
  "signature": "sha256=8d4063f0a81aa1531d9891a028a68cf2bb537ecdf0e82557674d71e168d570f9"
}

Example output

{
  "provider": "github",
  "reason": "signature matches the recomputed HMAC for this payload and secret",
  "scheme": "X-Hub-Signature-256: sha256=hex(HMAC-SHA256(secret, rawBody))",
  "valid": true
}

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
5 h agoPassed402192 ms$0.001