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x402 Transaction Verifier (lab.paidapis.net)
x402
x402 Transaction Verifier (lab.paidapis.net) is a paid API for AI agents from lab.paidapis.net, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).
Checks whether a given blockchain transaction hash is confirmed on Base mainnet and returns a signed attestation of its status.
Price / call$0.02
Success—
StatusUnknown
How this service works
Oracle: checks whether a base transaction hash has confirmed on-chain, and returns a signed (EIP-191) yes/no attestation — verifiable independently against 0x5a6d60f11C0E33f97E2De12b8B2b70d1B1FE9Efc, without trusting us again on a later call.
Output
Returns a JSON object with the chain name, the queried txHash, a checkedAt timestamp, a boolean confirmed flag, the block number (or null if unconfirmed), the signer address of the attestation service, and a cryptographic signature over the result — enabling downstream consumers to trust the confirmation report without querying the chain themselves.
Example use cases
Verify USDC payment receipt
“I need to confirm that the USDC payment with tx hash 0xabc123def456...7890 actually went through on Base — can you check if it's confirmed and get me a signed proof?”
Gating content behind confirmed payment
“Before I unlock this file for the user, check that their transaction 0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b is confirmed on Base mainnet and return the verification signature.”
Debugging a failed x402 payment flow
“My x402 payment might have stalled — can you verify whether tx hash 0xdeadbeef112233445566778899aabbccddeeff00112233445566778899aabbcc shows as confirmed on Base so I can figure out what went wrong?”
Technical details
Endpoint
GEThttps://lab.paidapis.net/api/verify-txWhen to prefer
Use this endpoint when you need a lightweight, signed attestation that a specific Base mainnet transaction is confirmed — especially in x402-payment or pay-per-call contexts where you want a cryptographic proof rather than raw RPC data. Prefer it over direct RPC calls when you need the signed signer-address attestation for downstream trust, or when you are building on the x402 protocol stack and want a consistent verification pattern. Not suitable for other chains or for streaming/real-time finality monitoring.
Side effects
- Invalid or malformed txHash (not 32 bytes / wrong format) — likely a 400 or validation error
- Transaction not yet indexed or very recent — may return confirmed: false even if eventually finalizing
- Network or RPC outage on Base — service may be temporarily unavailable
- Payment failure via x402 — call rejected before reaching verification logic if USDC payment is not valid
- Unknown txHash (never existed) — returns confirmed: false with null blockNumber
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| txHashrequired | string | 32-byte transaction hash to check. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| chain | string | |
| txHash | string | |
| checkedAt | string | |
| confirmed | boolean | |
| signature | string | |
| blockNumber | — | |
| signerAddress | string |
Tags
x402
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