# x402 Endpoint Payability Checker

> x402 Endpoint Payability Checker is a paid API for AI agents from x402-meta.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).

Validates whether a given URL is a live x402 payment-gated endpoint by fetching it unpaid, then inspecting the 402 response, pricing, supported chains, and Bazaar listing details.

## Facts

- Endpoint: GET https://x402-meta.x402tookit.com/x402-payability?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-endpoint-payability-checker-4613ced4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DQlXhXHnrAlTi5Je1Ef-H

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-payability-checker-4613ced4
```

Example prompt: Can you check whether https://api.example.com/some-endpoint is a real x402 payment-gated endpoint — tell me the verdict, what price it charges, which chains it supports, and whether it's properly listed on the Bazaar?

## When to prefer this

Use this endpoint when you need to programmatically verify that a specific URL is a functioning x402 payment-gated resource before integrating it, listing it, or purchasing from it. Ideal for agent workflows that need to validate third-party x402 services, debug x402 configuration issues, or confirm Bazaar listing correctness. Prefer this over manual inspection or generic HTTP probing tools when you need structured x402-specific metadata including price, networks, and Bazaar status in a single call.

## Known failure modes

- Target URL is not reachable or times out — httpStatus null, verdict negative
- URL returns 200 instead of 402 — flagged as not an x402 endpoint
- Malformed 402 response with missing price or network fields — reasons list populated
- Bazaar extension present but invalid — bazaarExtensionValid false
- URL contains credentials or is not a full https URL — input validation error
- Target endpoint rate-limits or blocks the probe request

## How this service works

Is this URL a valid x402 endpoint? Fetches it once unpaid and checks the 402 offer, price, chains and Bazaar listing block.

## Output

Returns a structured verdict object including: whether the URL is a valid x402 endpoint (verdict), x402 protocol version, list of USD prices, supported blockchain networks, payTo wallet addresses, HTTP status code received, Bazaar listing presence and validity flags, a human-readable summary and reasons, a degraded signal, and a timestamp (asOf).

## 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 endpoint, with no credentials"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "url": {
       "type": [
        "null",
        "string"
       ]
      },
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "payTo": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "networks": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "pricesUsd": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "number"
       }
      },
      "sourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "disclaimer": {
       "type": [
        "null",
        "string"
       ]
      },
      "httpStatus": {
       "type": [
        "null",
        "number"
       ]
      },
      "notChecked": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "resourceUrl": {
       "type": [
        "null",
        "string"
       ]
      },
      "x402Version": {
       "type": [
        "null",
        "number"
  
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-endpoint-payability-checker-4613ced4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-meta.x402tookit.com](https://www.zero.xyz/host/x402-meta.x402tookit.com/llms.txt)