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Base Transaction Lookup by Hash
x402
Base Transaction Lookup by Hash is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Fetches detailed on-chain data for a Base network transaction by its hash, including value, gas, fees, method selector, and explicit flags for contract creation and pending status.
Price / call$0.002
Success—
StatusUnknown
How this service works
🆕 A Base transaction by hash, unedited: from, to, value in wei and ETH, nonce, gas, fee caps, type, and the 4-byte method selector with the calldata size. Flags a contract creation (null to) and a still-pending transaction (null block) rather than leaving you to infer either. Unknown hashes answer found:false, not an error.
Output
Returns a JSON object containing: found (boolean), and if found: from, to (null for contract creation), value in wei and ETH, nonce, gas limit, maxFeePerGas, maxPriorityFeePerGas, transaction type, 4-byte method selector, calldata size in bytes, a contractCreation boolean flag, and a pending boolean flag (true if block is null). Unknown hashes return {found: false} rather than an error.
Example use cases
Confirming a payment was sent
“I just sent a payment on Base — can you check transaction 0xabc123...def456 and confirm how much ETH was transferred, who it went to, and whether it's confirmed yet?”
Identifying a smart contract call
“For Base tx hash 0x7f8e...c301, what function was called — show me the 4-byte selector and how big the calldata was, so I can figure out what the user was doing.”
Detecting contract deployment transactions
“Can you check if Base transaction 0x1d2c...8a9b was a contract deployment? I need to know if the 'to' field is null and flag it if it's a creation.”
Technical details
Endpoint
GEThttps://402.com.tr/api/x402/base-txWhen to prefer
Use this endpoint when you need structured, machine-readable Base transaction data including explicit semantic flags (contract creation, pending status) rather than inferring them from null fields yourself. Prefer this over generic blockchain explorers when you need a clean JSON response with both wei and ETH values, the 4-byte selector, and calldata size in a single pay-per-call call. Especially useful for agents that need to route logic based on whether a tx is a deployment, a call, or a plain transfer, without parsing raw RPC responses.
Side effects
- Unknown or invalid transaction hash returns {found: false} rather than an error — agent must check this flag
- Missing hash query parameter causes a validation error
- Transactions on networks other than Base are not found
- Very recent transactions may show as pending (null block) before confirmation
- Malformed hash strings may return found: false or a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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