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Base Transaction Lookup
x402
Base Transaction Lookup is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).
Returns a human-readable summary of a Base blockchain transaction including status, block info, sender/recipient, ETH value, gas fees, method selector, and decoded ERC-20 token transfers.
Price / call$0.005
Success—
StatusUnknown
How this service works
Human-readable summary of a Base transaction: status, block and time, sender and recipient, ETH value, gas used and fee, method selector, and decoded ERC-20 transfers with token symbols and amounts.
Output
A JSON object containing the transaction hash, chain, status (success/fail), block number, ISO timestamp, sender address, recipient address, ETH value transferred, gas used, gas fee in ETH, method selector (4-byte), and an array of decoded ERC-20 token transfers each with from/to addresses, token contract address, symbol, human-readable amount, and raw amount.
Example use cases
Verify a DeFi swap completed
“I just submitted a swap on Base — can you check transaction 0xff80142e4591e95e4088a7f37838e359843151633209f62a3b39f85402cc7d06 and tell me if it succeeded, what tokens were swapped, and how much I paid in fees?”
Audit an incoming payment
“Someone says they sent me USDC on Base — can you look up transaction 0xff80142e4591e95e4088a7f37838e359843151633209f62a3b39f85402cc7d06 and confirm how much USDC was transferred to my address and when the transaction was confirmed?”
Debug a failed onchain transaction
“I think my Base transaction 0xff80142e4591e95e4088a7f37838e359843151633209f62a3b39f85402cc7d06 might have failed — can you check the status, show me the block it landed in, and tell me how much gas was consumed?”
Technical details
Endpoint
GEThttps://onchaincheck.dev/base/tx?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a complete, human-readable breakdown of a specific Base transaction — especially when you need decoded ERC-20 transfer details with token symbols and amounts, which raw RPC calls don't provide out of the box. Prefer this over raw ethers.js or web3 calls when you need decoded token transfers without writing ABI parsing logic, or over block explorers when you need structured JSON output rather than a webpage.
Side effects
- Invalid transaction hash format (not matching 0x + 64 hex chars) returns a validation error
- Transaction hash not found on Base returns a not-found error
- Pending or unconfirmed transactions may not return complete data
- Token symbols for unverified contracts may be missing or null
- Rate limits or upstream RPC issues may cause 5xx errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"to": "0xd6145b2D3F379919E8CdEda7B97e37c4b2Ca9c40",
"fee": "0.000001440003084728",
"from": "0xf87F67497C535f856670518a3577b2bfC1bEE976",
"hash": "0xff80142e4591e95e4088a7f37838e359843151633209f62a3b39f85402cc7d06",
"chain": "base",
"value": "0.0005",
"status": "success",
"gasUsed": 130678,
"timestamp": "2026-10-22T15:30:13.000Z",
"blockNumber": 52946833,
"nativeSymbol": "ETH",
"methodSelector": "0x3593564c",
"tokenTransfers": [
{
"to": "0xf87F67497C535f856670518a3577b2bfC1bEE976",
"raw": "1198173",
"from": "0x1C450D7d1FD98A0b04E30deCFc83497b33A4F608",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "1.198173",
"symbol": "USDC"
},
{
"to": "0x1C450D7d1FD98A0b04E30deCFc83497b33A4F608",
"raw": "500000000000000",
"from": "0xd6145b2D3F379919E8CdEda7B97e37c4b2Ca9c40",
"token": "0x4200000000000000000000000000000000000006",
"amount": "0.0005",
"symbol": "WETH"
}
],
"contractCreated": null
}
}Tags
x402
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