# s2ar x402 Endpoint Inspector

> s2ar x402 Endpoint Inspector is a paid API for AI agents from api.s2ar.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Probes a given HTTPS endpoint for its x402 payment-wall properties — 402 status, accepted payment methods, price, Bazaar extension, and CDP verdict — returning a signed, verifiable record.

## Facts

- Endpoint: GET https://api.s2ar.dev/x402/v1/x402/inspect?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/s2ar-x402-endpoint-inspector-a67953c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_upfGYrvs9bZpQfmPTBf7w

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 s2ar-x402-endpoint-inspector-a67953c7
```

Example prompt: Inspect the x402 payment requirements for https://api.example.com/some/paid-endpoint — I want to know its price, what payment methods it accepts, whether it's on Bazaar, and the CDP verdict, with a signed record I can verify.

## When to prefer this

Use this endpoint when you need to programmatically discover or verify the payment terms of any x402-compliant API before calling it, when you want an auditable signed record of those terms, or when you need to determine if an endpoint is listed on Bazaar and has received a CDP verdict. It is the authoritative inspection tool for the x402 protocol ecosystem.

## Known failure modes

- Resource URL is not reachable — endpoint may be offline or behind a firewall
- Resource URL does not return a 402 — not an x402-compliant endpoint
- Invalid or malformed URL in the resource parameter
- Requested checks subset doesn't match available check identifiers
- Timeout when probing a slow upstream endpoint

## How this service works

Inspect an x402 endpoint — its 402, accepts, price, Bazaar extension, CDP verdict; a signed record. GET ?resource=

## Output

A signed record containing: whether the endpoint returns a 402, the accepted payment schemes, the listed price, details of any Bazaar extension, and the CDP (Coinbase Developer Platform) verdict. The signature allows anyone to independently verify the inspection result.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "required": [
      "resource"
     ],
     "properties": {
      "checks": {
       "type": "string",
       "description": "a subset of GET /v1/x402/inspect/checks (default: all)"
      },
      "method": {
       "type": "string",
       "description": "how to probe it (default GET)"
      },
      "resource": {
       "type": "string",
       "description": "the endpoint's https URL"
      }
     },
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/s2ar-x402-endpoint-inspector-a67953c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.s2ar.dev](https://www.zero.xyz/host/api.s2ar.dev/llms.txt)