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x402 Base Tools – x402 Payment Checker
x402
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.
Price / call$0.001
Success—
StatusUnknown
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.
Example use cases
Confirm a customer micropayment settled
“I just got a transaction hash from a customer — 0xabc123... — can you verify it's actually an x402 payment and tell me how much USDC they sent and to which address?”
Identify facilitator behind a payment
“For Base transaction 0xdef456..., can you pull up the x402 payment details and tell me which facilitator address routed it?”
Resolve seller from payTo address
“I have a Base tx hash — 0x789ghi... — can you look up the x402 payment details and tell me which seller and origin URLs are associated with the payTo address?”
Technical details
Endpoint
GEThttps://wt7tysfcmjm8fpzl.68r.lambda-web.us-east-1.on.aws/v1/x402-payment?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"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..."
}
}Tags
x402
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