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x402 Base Transaction Finality Check
x402
x402 Base Transaction Finality Check is a paid API for AI agents from x402-mcp.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Checks whether a specific Base (L2) transaction has reached finality on-chain, returning confirmation count, block status, and reorg-safety proof
Price / call$0.01
Success—
StatusUnknown
How this service works
MCP server for x402 HTTP micropayments with agent-commerce overlay
Output
Returns a JSON object containing: the transaction hash, a human-readable explanation of finality status, the ISO timestamp of the check, a status string (e.g. 'finalized'), whether the tx is included, the tx block number, safe block, latest block, finalized block number, and total confirmations count.
Example use cases
Confirm payment before releasing goods
“Before I release the digital download, can you verify that Base transaction 0x7fe54ef102682c07d2091d5623cb86df8be1ca929ae4cfb90fbdd6e73eba2c40 is fully finalized and a reorg is no longer possible?”
Agent settlement confirmation gate
“My agent just submitted a USDC payment on Base — check if tx 0x7fe54ef102682c07d2091d5623cb86df8be1ca929ae4cfb90fbdd6e73eba2c40 has been L1-confirmed and tell me the current confirmation count and finalized block.”
Audit trail for on-chain micropayment
“I need to log whether our Base transaction 0x7fe54ef102682c07d2091d5623cb86df8be1ca929ae4cfb90fbdd6e73eba2c40 was included in a finalized block and what block number that was, for our compliance records.”
Technical details
Endpoint
GEThttps://x402-mcp.onrender.com/base/finality-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need cryptographic certainty that a Base L2 transaction is irreversible — specifically when you need the 'finalized' checkpoint status (L1-confirmed, reorg-impossible), not just a high confirmation count. Prefer this over generic block explorers when your agent workflow requires a machine-readable, structured finality verdict with block-level evidence, especially in payment settlement, escrow release, or compliance logging scenarios on the Base network.
Side effects
- Transaction hash not found on Base — returns null or error if the tx doesn't exist
- Transaction not yet finalized — returns status other than 'finalized' with lower confirmation count
- Network connectivity issues with Base RPC — may return timeout or upstream error
- Invalid transaction hash format — schema validation error on input
- Pending payment failure — x402 micropayment not processed, returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"tx": "0x7fe54ef102682c07d2091d5623cb86df8be1ca929ae4cfb90fbdd6e73eba2c40",
"why": "Block 49106777 is at or behind the chain's 'finalized' block (49115873) -- L1-confirmed, reorg is not possible.",
"as_of": "2026-07-25T23:00:00+00:00",
"status": "finalized",
"included": true,
"tx_block": 49106777,
"safe_block": 49116306,
"latest_block": 49116340,
"confirmations": 9563,
"finalized_block": 49115873
}
}Tags
x402
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