# x402 Base Tools – x402 Payment Checker

> x402 Base Tools – x402 Payment Checker is a paid API for AI agents from wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-29).

Given a Base transaction hash, checks whether it settled x402 payments (USDC transferWithAuthorization / EIP-3009), and returns payer, payTo address, amount in USDC, nonce, facilitator, and seller info from Bazaar listings.

## Facts

- Endpoint: GET https://wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws/v1/x402-payment?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-base-tools-x402-payment-checker-6c0b7010
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0-2uXGznvPxQ8SQX8eB16

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-base-tools-x402-payment-checker-6c0b7010
```

Example prompt: Can you check if Base transaction 0x3a7f...b2c1 was an x402 payment — I want to know who the payer was, what they paid, and which facilitator handled it?

## When to prefer this

Use this endpoint when you need to verify whether a specific Base transaction hash represents a settled x402 payment using USDC transferWithAuthorization (EIP-3009), and want structured details about payer, payee, amount, nonce, facilitator, and seller identity from Bazaar listings — especially in agentic payment flows where confirming receipt of a micropayment before serving content is required.

## Known failure modes

- Transaction hash not found on Base — returns error or empty result
- Transaction exists but contains no EIP-3009 transferWithAuthorization events — is_x402: false
- Invalid hash format (not 0x-prefixed or wrong length) — validation error
- payTo address not listed in Bazaar — seller field may be null or empty
- Network timeout or Lambda cold start — transient 5xx error
- Hash of a transaction on a different chain (not Base) — may return no results or incorrect data

## How this service works

Base mainnet data for agents, read live from the chain and paid per call in USDC: gas prices and costs, token prices from Uniswap and Aerodrome pools, balances, token info, transaction decoding, x402 payment checks, EIP-3009 authorization status, Basenames and address profiles. Lookups of things that do not exist are not charged.

## Output

Returns a JSON object with status ('success'), is_x402 boolean indicating whether the transaction contains x402 payments, a payments array (each with payer address, pay_to address, seller info including origin URLs and 30-day payers, amount in USD, and authorization nonce), and the facilitator address that sent the transaction.

## 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": [
      "hash"
     ],
     "properties": {
      "hash": {
       "type": "string",
       "description": "transaction hash (0x...)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "status": {},
      "is_x402": {},
      "payments": {},
      "facilitator": {}
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "status": "success",
  "is_x402": true,
  "payments": [
   {
    "payer": "0xa1d1...",
    "pay_to": "0xe6f7...",
    "seller": {
     "origins": [
      "https://rtnl1z960zy00xyx.68r.lambda-web.us-east-1.on.aws"
     ]
    },
    "amount_usd": 0.01
   }
  ],
  "facilitator": "0x2a89..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-base-tools-x402-payment-checker-6c0b7010/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws](https://www.zero.xyz/host/wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws/llms.txt)