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Base Chain Transaction Lookup (x402)
x402
Base Chain Transaction Lookup (x402) is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Retrieves detailed on-chain transaction data for a given Base network transaction hash, including transfers, USDC flows, gas usage, and x402 payment verification.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
Returns a JSON object with the transaction's hash, sender, recipient, block number, chain, contract method called, success status, ETH fee, gas used, timestamp, number of confirmations, ETH value, a list of token transfers (including token address, amount, symbol, from/to), a map of USDC received per address, a payment_verified boolean, and an is_x402_settlement boolean.
Example use cases
Verify x402 micropayment before serving content
“Before I unlock the premium data, check that Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca actually sent at least 0.002 USDC to 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 and that it's confirmed.”
Debug failed on-chain payment
“I sent a transaction on Base with hash 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca but I'm not sure it went through — can you check the status, gas used, and whether any USDC actually moved?”
Audit x402 settlement for accounting
“Pull the full details for Base tx 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca — I need the timestamp, block number, USDC transfers, and confirmation that it was flagged as an x402 settlement for my records.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/api/chain/tx?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to verify or inspect a specific Base chain transaction — especially to confirm x402 micropayment settlement, check USDC transfer details, or validate on-chain state before releasing a resource. Prefer it over block explorers when you need structured, machine-readable output with x402 payment verification flags rather than human-readable HTML pages. It requires no API key and charges only $0.002 USDC per call via x402.
Side effects
- Invalid or malformed transaction hash (not matching ^0x[0-9a-fA-F]{64}$) returns a validation error
- Transaction not found on Base returns a 404 or empty result
- Payment not yet confirmed may return payment_verified: false
- x402 payment of 0.002 USDC required per call; missing or failed payment returns HTTP 402
- Network congestion or RPC timeout may cause transient errors
- Providing expect_to or expect_usdc that don't match actual tx data returns payment_verified: false
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "0xca11bde05977b3631167028862be2a173976ca11",
"from": "0xc6699d2aada6c36dfea5c248dd70f9cb0235cb63",
"hash": "0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca",
"block": 53220068,
"chain": "base",
"method": "aggregate3 (Multicall3)",
"status": "success",
"fee_eth": 6.5e-7,
"gas_used": 92312,
"timestamp": "2026-10-28T23:18:03Z",
"transfers": [
{
"to": "0xe4be4d0bd82d8e68203deff81f79ede0529f2617",
"from": "0xa1d1c0cf717402ff3651aa4873ccf96410b01978",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": 0.002,
"symbol": "USDC"
}
],
"value_eth": 0,
"confirmations": 21764,
"usdc_received": {
"0xe4be4d0bd82d8e68203deff81f79ede0529f2617": 0.002
},
"payment_verified": true,
"is_x402_settlement": true
}
}Tags
x402
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