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Event Log Decoding & Payment Verification for Base Transactions
x402
Event Log Decoding & Payment Verification for Base Transactions 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).
Decodes a Base blockchain transaction by hash, returning transfer logs, method name, gas, and x402 payment verification status
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 hash, block number, chain, decoded method name (e.g. 'aggregate3 (Multicall3)'), status, gas used, fee in ETH, timestamp, all ERC-20 transfers (from/to/token/amount/symbol), ETH value, confirmations, a usdc_received map keyed by recipient address, payment_verified boolean, and is_x402_settlement flag.
Example use cases
Verify x402 micro-payment before serving response
“Before I release the data, can you check that transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca on Base actually sent 0.002 USDC to 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 and was marked as a verified x402 settlement?”
Audit onchain transfer log for agent accounting
“Decode Base tx 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and give me all the token transfers, the method called, gas used, and the block timestamp so I can log it in my agent's payment ledger.”
Confirm counterparty payment receipt
“A trading bot says it paid me — can you look up Base transaction 0x3ea6d07f7e990ba4c2289487cd12ea41b6e13b48518fa38b24de2afd1df1d8ca and tell me exactly how much USDC arrived at my wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 and whether payment_verified is true?”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/event-log-decoding?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to cryptographically confirm that a Base blockchain transaction settled correctly — particularly for x402 micro-payment verification before releasing a service or data. It is the right choice when you have a tx hash and need decoded transfer logs plus a structured payment_verified flag, rather than raw RPC data. Prefer it over generic block explorers when you need machine-readable JSON with USDC receipt confirmation in a single call.
Side effects
- Invalid or malformed tx hash (not matching ^0x[0-9a-fA-F]{64}$) returns a 400 error
- Transaction not found on Base returns a 404 or empty result
- Transaction still pending (0 confirmations) may return unconfirmed or error state
- expect_to / expect_usdc mismatch returns payment_verified: false rather than an error
- x402 payment failure (insufficient USDC micropayment) blocks the call entirely
- Network timeouts from Base RPC nodes may cause intermittent 5xx responses
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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