CrossChain Sandbox
Generate structurally valid mock Flare Data Connector proofs for local tests. Pick an attestation type, fill in the request body, and get a response JSON you can paste into a Foundry or Hardhat test fixture.
Mock only
Every proof generated here is a fixture: structurally compatible with the real Flare Data Connector response schema, but the merkle root is not attested on-chain. Real FDCVerification.verify() calls will reject these. Use only in unit / integration tests.
Attestation type
Payment request
Flare docs →Hash or id of the payment transaction on the source chain.
Index of the source address in UTXO inputs (UTXO chains only, else 0).
Index of the receiving UTXO output (UTXO chains only, else 0).