# GENESIS Agent Tools — Webhook Signature Verifier

> GENESIS Agent Tools — Webhook Signature Verifier is a paid API for AI agents from genesis-agent-tools.genesisagenttools.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-01).

Verifies that a webhook signature matches the expected HMAC or similar signature derived from a shared secret and request body.

## Facts

- Endpoint: POST https://genesis-agent-tools.genesisagenttools.workers.dev/api/tools/webhook-signature-verify?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/genesis-agent-tools-webhook-signature-verifier-fb4750e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eUgEXS3rSHhJM-GgWChK8

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability genesis-agent-tools-webhook-signature-verifier-fb4750e8 -d '<json body>'
```

Example prompt: Can you verify this webhook signature for me — the body is '{"event":"payment.completed","amount":100}', the shared secret is 'whsec_abc123xyz', and the signature is 'sha256=abcdef1234567890'?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call webhook signature verification step inside an autonomous agent workflow, especially when you want to avoid standing up your own HMAC verification service. Particularly suited for agent pipelines built on the x402 micropayment protocol with Base USDC, where you only pay $0.01 per verification and don't need to maintain infrastructure.

## Known failure modes

- Missing required fields (body, secret, or signature) results in a 400 error
- Signature mismatch returns {"valid": false} without an error
- Invalid or malformed signature format may return false or a parsing error
- Payment failure (x402) if USDC balance is insufficient
- Network timeout or Cloudflare Worker cold start latency on rare occasions

## How this service works

Pay-per-call x402 APIs for autonomous agents on Base USDC: API compatibility analysis, bounded HTTP/JSON workflows, URL evidence analysis, crypto price consensus, and agent/MCP readiness checks.

## Output

Returns a JSON object with a single boolean field 'valid' — true if the provided signature matches what is computed from the body and secret, false otherwise.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "body",
  "secret",
  "signature"
 ],
 "properties": {
  "body": {
   "type": "string"
  },
  "secret": {
   "type": "string"
  },
  "signature": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "valid": {
   "type": "boolean"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/genesis-agent-tools-webhook-signature-verifier-fb4750e8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from genesis-agent-tools.genesisagenttools.workers.dev](https://www.zero.xyz/host/genesis-agent-tools.genesisagenttools.workers.dev/llms.txt)