# x402 Endpoint Validator / Checker

> x402 Endpoint Validator / Checker is a paid API for AI agents from solana-token-check.vercel.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).

Validates and inspects an x402 pay-per-call HTTP endpoint, returning its payment options, pricing, network compatibility, and overall verdict

## Facts

- Endpoint: GET https://solana-token-check.vercel.app/v1/x402-check?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-endpoint-validator-checker-dea4bf0d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_BbtwvoPpqLIPfgjSfkmIK

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 x402-endpoint-validator-checker-dea4bf0d
```

Example prompt: Can you check whether https://solana-token-check.vercel.app/v1/trending is a valid x402 endpoint and tell me the cheapest payment option available and which networks it supports?

## When to prefer this

Use this endpoint when you need to validate or audit an x402 pay-per-call URL before committing payment, compare pricing across x402 services, debug x402 integration issues, or programmatically discover the payment options and network compatibility of any x402 endpoint. It is the right choice whenever the primary goal is inspection and validation of the x402 protocol configuration rather than consuming the underlying data service.

## Known failure modes

- URL is not an x402 endpoint (returns non-402 status, verdict may be 'not_x402')
- Endpoint unreachable or times out
- Endpoint only has testnet options (mainnet_options = 0)
- Malformed x402 headers causing parse errors
- Invalid URL format in query parameter

## How this service works

Cheap pay-per-call Solana data: token risk check, trending tokens, newest tokens, wallet snapshot, token price feed, full token due-diligence report, transaction explainer, address profile, China trending topics. USDC on Solana or Base via x402, no account, no API key.

## Output

Returns a JSON object containing: the endpoint URL, a verdict (e.g. 'ok'), HTTP status code, x402 version number, number of mainnet payment options, the cheapest price in USD, a list of payment options with network and asset details, any issues detected, and a human-readable English summary of the endpoint's payment configuration.

## 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",
       "description": "Full https URL of the x402 endpoint to check"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "url",
      "verdict",
      "http_status",
      "x402_version",
      "mainnet_options",
      "cheapest_usd",
      "options",
      "issues",
      "summary_en"
     ],
     "properties": {
      "url": {},
      "issues": {},
      "options": {},
      "verdict": {},
      "summary_en": {},
      "http_status": {},
      "cheapest_usd": {},
      "x402_version": {},
      "mainnet_options": {}
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com/api",
  "issues": [],
  "options": [
   {
    "network": "eip155:8453",
    "price_usd": 0.001,
    "asset_symbol": "USDC"
   }
  ],
  "verdict": "ok",
  "summary_en": "Valid x402 endpoint: 2 mainnet option(s), from $0.001 USDC.",
  "http_status": 402,
  "cheapest_usd": 0.001,
  "x402_version": 2,
  "mainnet_options": 2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-endpoint-validator-checker-dea4bf0d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from solana-token-check.vercel.app](https://www.zero.xyz/host/solana-token-check.vercel.app/llms.txt)