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.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.02 USDC | 0xf74f...1319 |