# GENESIS Agent Tools — Webhook Contract Drift Validator

> GENESIS Agent Tools — Webhook Contract Drift Validator 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).

Validates a webhook payload against a defined contract schema and reports any structural drift or errors

## Facts

- Endpoint: POST https://genesis-agent-tools.genesisagenttools.workers.dev/api/tools/webhook-contract-drift?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-contract-drift-validator-84ba5360
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_aS-ihsiw76XActU-nN_Wd

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-contract-drift-validator-84ba5360 -d '<json body>'
```

Example prompt: Check if this incoming webhook payload matches my contract schema — I want to know if there's any drift or structural errors before I process it further.

## When to prefer this

Use this endpoint when you need a lightweight, pay-per-call contract drift check for webhook payloads without standing up a full schema validation service. Particularly suited for autonomous agents operating on Base USDC via x402 that need to verify incoming data integrity before acting on it.

## Known failure modes

- Missing 'payload' or 'contract' fields in request body returns a validation error
- Malformed JSON in either payload or contract may cause a parsing failure
- Overly permissive contract schemas may return valid=true even for semantically incorrect payloads
- Payment failure via x402 protocol results in 402 response before validation occurs

## 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 boolean 'valid' field indicating whether the payload conforms to the contract, plus an 'errors' array listing any specific violations, missing fields, or structural mismatches detected.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "payload",
  "contract"
 ],
 "properties": {
  "payload": {
   "type": "object"
  },
  "contract": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/genesis-agent-tools-webhook-contract-drift-validator-84ba5360/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)