# Ghost Identity — x402 Seller Vet

> Ghost Identity — x402 Seller Vet is a paid API for AI agents from ghost-identity.ghost-agent-os.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Probes and verifies an x402-paid endpoint or seller address to confirm its payment terms, price, and legitimacy before an agent commits funds

## Facts

- Endpoint: POST https://ghost-identity.ghost-agent-os.workers.dev/v1/vet
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ghost-identity-x402-seller-vet-8bce7407
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pCLhoHu72Ym73Qk9e96fg

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 ghost-identity-x402-seller-vet-8bce7407 -d '<json body>'
```

Example prompt: Before my agent pays, can you vet this x402 endpoint at https://api.example.com/data — the listing said it costs 1000 USDC minor units, so check if the live quote actually matches that and whether the seller address 0xAbC123 looks legitimate.

## When to prefer this

Use this endpoint when an AI agent is about to spend USDC on an x402-gated API and needs to verify the seller's identity and price before committing funds — especially when the endpoint was discovered from an untrusted directory or marketplace listing. Prefer this over blindly paying any x402 endpoint when the advertised price needs cross-checking against the live quote, or when the seller address is unknown.

## Known failure modes

- Endpoint URL unreachable or returns non-402 response — cannot read live terms
- Seller address malformed or not a valid EVM address — validation fails
- Advertised amount mismatch — live quote differs from advertised_amount, flagged as discrepancy
- Endpoint returns 402 but with missing or malformed payment headers — partial parse failure
- Network or Cloudflare Worker timeout if the target endpoint is slow to respond

## How this service works

Paid per call via x402 (exact / eip155:8453 / USDC). Any x402-capable client pays automatically: agentcash, @x402/fetch, x402-fetch. Every paid operation carries x-payment-info; the same terms are served live as a 402.

## Output

Returns the live x402 payment terms read directly from the seller's endpoint (network, currency, amount, payTo address), a comparison result indicating whether the live quote matches the advertised price, and signals indicating whether the seller address and terms appear consistent and trustworthy.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "address": {
   "type": "string",
   "title": "Address",
   "default": "",
   "maxLength": 64,
   "description": "The seller's payment address (payTo). Optional if endpoint_url is given — the 402 names its own address."
  },
  "endpoint_url": {
   "type": "string",
   "title": "Endpoint Url",
   "default": "",
   "maxLength": 2048,
   "description": "The seller's paid endpoint, probed with one unpaid request to read its x402 terms."
  },
  "advertised_amount": {
   "anyOf": [
    {
     "type": "integer",
     "minimum": 0
    },
    {
     "type": "null"
    }
   ],
   "title": "Advertised Amount",
   "default": null,
   "description": "The price a listing advertised, in minor units, to compare against the live quote."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ghost-identity-x402-seller-vet-8bce7407/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ghost-identity.ghost-agent-os.workers.dev](https://www.zero.xyz/host/ghost-identity.ghost-agent-os.workers.dev/llms.txt)