# StealthGuard x402 Endpoint Verifier

> StealthGuard x402 Endpoint Verifier is a paid API for AI agents from stealthguard-402.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Audits x402 payment endpoints for wallet authenticity, pricing integrity, challenge header validity, and schema hijack risks

## Facts

- Endpoint: POST https://stealthguard-402.onrender.com/v1/security/x402-endpoint-verifier?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/stealthguard-x402-endpoint-verifier-6a357d83
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_74pIvjZThK9d1IWgS7GvS

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 stealthguard-x402-endpoint-verifier-6a357d83 -d '<json body>'
```

Example prompt: Before I pay that x402 API, audit it for me — check whether the payTo wallet is authentic, the pricing is what it claims, the challenge headers are valid, and there are no schema hijack risks. The endpoint is POST https://someapi.example.com/v1/data.

## When to prefer this

Use this endpoint when an AI agent is about to pay an x402 endpoint and needs a security gate to verify the payment target is legitimate. Prefer this over manual inspection when automating x402 payment flows, integrating unknown third-party x402 APIs, or running agent pipelines where wallet drainer or schema hijack attacks are a concern. Especially valuable before looping payments or high-frequency autonomous agent calls.

## Known failure modes

- Target endpoint is unreachable or returns non-x402 response
- Malformed input body or missing required fields causes 400 error
- Target endpoint uses non-standard x402 schema that cannot be parsed
- Inconclusive wallet verification if on-chain data is unavailable
- Timeout if the target endpoint is slow to respond to challenge probes

## How this service works

Audits target x402 endpoints for authentic payTo wallet, pricing, challenge headers, and schema hijack risks.

## Output

Returns an audit report covering: authenticity of the payTo wallet address, correctness and consistency of pricing headers, validity of x402 challenge headers, and any detected schema hijack or manipulation risks — structured as a security verdict that an agent can act on before initiating payment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "endpoint_url": {
   "type": "string",
   "description": "Target x402 endpoint URL to audit"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/stealthguard-x402-endpoint-verifier-6a357d83/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stealthguard-402.onrender.com](https://www.zero.xyz/host/stealthguard-402.onrender.com/llms.txt)