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Base Transaction Lookup API
x402
Base Transaction Lookup API is a paid API for AI agents from base-facts.yankii.fr, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Fetches on-chain details for a specific Base mainnet transaction by its hash, including gas, status, transfers, and block info
Price / call$0.003
Success—
StatusUnknown
How this service works
Get transaction status, fee, and decoded ERC20 Transfer events
Output
Returns a JSON object with the transaction's to/from addresses, hash, status (success/failure), gas used, effective gas price, fee in ETH, block number, Unix timestamp, ERC-20 transfers array, and contract address if applicable — all sourced from Base mainnet RPC.
Example use cases
Verify payment confirmed on Base
“I just sent a payment on Base with tx hash 0xabc123...def456 — can you confirm it went through, who it went to, and how much the fee was?”
Audit ERC-20 token transfer
“Pull up the on-chain details for Base transaction 0x7f8e...2a1b — I need to see all ERC-20 transfers that happened in that transaction.”
Debug failed transaction
“This Base transaction 0xd3c9...88fa seems like it might have failed — can you check its status and tell me the gas used vs what was provided?”
Technical details
Endpoint
POSThttps://base-facts.yankii.fr/v1/tx?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need detailed on-chain facts about a specific Base mainnet transaction — particularly when you need gas metrics, ERC-20 transfer data, status confirmation, or timestamp/block info — and you are operating in a context where x402 micropayments are supported.
Side effects
- Invalid or malformed transaction hash returns an error
- Transaction hash not found on Base mainnet (e.g. wrong network)
- RPC node timeout or connectivity issues
- Hash exists but transaction is still pending
- Payment of 0.003 USDC not fulfilled, returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hash | string | 0x-prefixed 32-byte transaction hash |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "0x...",
"from": "0x...",
"hash": "0x...",
"feeEth": "0.000000021",
"source": "base-mainnet-rpc",
"status": "success",
"gasUsed": "21000",
"timestamp": "1700000000",
"blockNumber": "52130000",
"erc20Transfers": [],
"contractAddress": null,
"effectiveGasPrice": "100000000"
}
}Tags
x402
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