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Ontario Protocol Base Transaction Checker
x402
Ontario Protocol Base Transaction Checker is a paid API for AI agents from ontarioprotocol.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Looks up a Base mainnet transaction by hash, decodes ERC-20 transfers and EIP-3009 authorizations, and optionally verifies that a specific payTo address and amount were satisfied — ideal for confirming x402 payment settlement.
Price / call$0.002
Success—
StatusUnknown
How this service works
Did this Base payment settle? Status, block, timestamp and confirmations for one transaction hash, with its ERC-20 Transfers decoded (token, from, to, amount; up to 100 listed, transfers_total gives the full count) and any EIP-3009 authorization used, plus match flags for an optional expected payTo and amount, so an x402 PAYMENT-RESPONSE can be checked. Required: hash. $0.002 USDC on Base. Transaction not found, no charge. No account, no API key. Base mainnet only. By Ontario Protocol.
Output
Returns transaction status (success/failed/pending), block number, timestamp, confirmations count, decoded ERC-20 transfers (up to 100, with token address, symbol, decimals, from, to, raw and formatted amounts), EIP-3009 authorization details, a USDC payment summary, gas used, effective gas price, and — when expected_to and expected_amount are provided — boolean match flags indicating whether those conditions were met.
Example use cases
Confirm x402 payment before serving content
“Before I unlock this API response, verify that transaction 0xfe14a1712c65c815f1f056cb6b2fbe0f72b2b44eee0990bab5ece2914d7a0883 on Base actually sent 500000 atomic USDC to 0xa2d72aBF2C5e939fdDCA4156B74dE482e03CA3ec.”
Agent payment receipt validation
“My agent just paid for an x402 API call and got back a transaction hash — 0xfe14a1712c65c815f1f056cb6b2fbe0f72b2b44eee0990bab5ece2914d7a0883. Can you check if it's confirmed on Base and show me the ERC-20 transfers that happened in it?”
Audit USDC transfer on Base
“I need to audit a Base mainnet transaction — hash 0xfe14a1712c65c815f1f056cb6b2fbe0f72b2b44eee0990bab5ece2914d7a0883. Show me the block it landed in, how many confirmations it has, and all the USDC transfers decoded with from/to/amount.”
Technical details
Endpoint
GEThttps://ontarioprotocol.com/api/x402/base/tx-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to confirm settlement of a Base mainnet transaction, especially for x402 payment verification where you must validate that USDC reached a specific recipient address at a specific amount. It is the right choice when you need decoded ERC-20 transfers and EIP-3009 authorization data in a single call, without needing a full blockchain explorer or holding an API key. Prefer it over generic RPC calls when you want match flags for payTo/amount validation built in.
Side effects
- Transaction hash not found on Base mainnet — no charge, response indicates not found
- Invalid hash format (not 0x + 64 hex chars) — rejected before payment
- Network connectivity issues to Base RPC — may return error
- Transaction too recent and not yet indexed — may return not found
- More than 100 transfers in the transaction — only first 100 listed, transfers_total gives full count
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"example": {
"to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"from": "0x2A89407a98A0732b7fD578c4E156B7166540EB5A",
"hash": "0xfe14a1712c65c815f1f056cb6b2fbe0f72b2b44eee0990bab5ece2914d7a0883",
"block": 51838957,
"schema": "ontario.base_tx_check.v1",
"source": "Base RPC",
"status": "success",
"network": "eip155:8453",
"read_at": "2026-10-25T00:46:05Z",
"expected": {
"to": "0xa2d72aBF2C5e939fdDCA4156B74dE482e03CA3ec",
"rule": "Any USDC Transfer in the transaction; with expected_to set, the amount must be on a transfer to it.",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"to_matches": true,
"amount_atomic": "500000",
"amount_matches": true
},
"gas_used": 86302,
"timestamp": "2026-09-27T00:01:01Z",
"transfers": [
{
"to": "0xa2d72aBF2C5e939fdDCA4156B74dE482e03CA3ec",
"raw": "500000",
"from": "0xc9c7b38C0942914fC8EA12063BC92dcd3b581670",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"symbol": "USDC",
"decimals": 6,
"formatted": "0.5"
}
],
"block_hash": "0xa6d26e6d5666d11350491e89b07659b8887804b3d6d7fac532c4da1ec4a4fceb",
"usdc_payment": {
"payer": "0xc9c7b38C0942914fC8EA12063BC92dcd3b581670",
"recipient": "0xa2d72aBF2C5e939fdDCA4156B74dE482e03CA3ec",
"amount_usdc": "0.5",
"amount_atomic": "500000",
"eip3009_authorization_observed": true
},
"confirmations": 1210953,
"transfers_total": 1,
"authorizations_used": [
{
"nonce": "0x366fed83f5c2c8d619f993a8d33c75765208dde91a214676944640d98d040178",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"authorizer": "0xc9c7b38C0942914fC8EA12063BC92dcd3b581670"
}
],
"effective_gas_price_wei": "6857500"
}
}Tags
x402
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