# Citiview x402 Endpoint Checker

> Citiview x402 Endpoint Checker is a paid API for AI agents from agents.citiviewgroup.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-14).

Tests any paid x402 URL for correct 402 response, pricing, network, pay-to address, discovery metadata, CORS, response time, and Coinbase validator compliance, then lists all issues found.

## Facts

- Endpoint: GET https://agents.citiviewgroup.com/v1/x402/check?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/citiview-x402-endpoint-checker-e4ae19a6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6NIPXx8quJnrgdRo6jQ8z

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 citiview-x402-endpoint-checker-e4ae19a6
```

Example prompt: Can you run a full x402 compliance check on https://myapi.example.com/v1/data — I want to know if the 402 response, price, pay-to address, CORS headers, and Coinbase validator all look correct, and get a list of any issues to fix?

## When to prefer this

Choose this endpoint when you need to specifically validate an x402-protocol paid API endpoint for spec compliance, Coinbase validator approval, and deployment readiness. It is purpose-built for x402 diagnostics unlike generic HTTP checkers or uptime monitors that lack payment protocol awareness.

## Known failure modes

- Target URL is unreachable or returns a non-402 response — reported as a compliance failure
- URL does not implement x402 at all — checker reports missing required fields
- CORS misconfiguration detected and reported in issues list
- Coinbase validator rejects the endpoint — failure reason included in results
- Malformed pay-to address or unsupported network — flagged in issues
- Slow response time exceeding acceptable thresholds — flagged as a warning

## How this service works

x402 endpoint checker: tests any paid x402 URL for a correct 402, price and networks, pay-to address, discovery metadata, CORS, response time and Coinbase's validator, and lists every issue to fix.

## Output

Returns a structured diagnostic report covering: whether the URL returns a proper HTTP 402 status, the detected price and accepted networks, the pay-to address, discovery metadata fields, CORS header correctness, measured response time, Coinbase validator pass/fail result, and an itemized list of every issue detected that needs to be fixed.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string"
      },
      "method": {
       "type": "string",
       "description": "GET (default) or POST"
      }
     }
    }
   },
   "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/citiview-x402-endpoint-checker-e4ae19a6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agents.citiviewgroup.com](https://www.zero.xyz/host/agents.citiviewgroup.com/llms.txt)