Estimation-Only

The create-tx endpoint is designed for both estimation and transaction construction. It can be safely called without specifying authority or recipient addresses when a wallet address is not yet available—for example, during early stages of interaction in a dApp. In such cases, the endpoint can still be used to suggest input or output token amounts.

Once the wallet address becomes available, the same create-tx request can be repeated with the necessary parameters to retrieve a full transaction call.

To maintain solver profitability and ensure the order remains valid upon submission, it is recommended to allow the API to compute a reasonable output amount. This is achieved by setting the dstChainTokenOutAmount parameter to auto in both the estimation and transaction calls.

Additionally, orders should be submitted within 30 seconds of retrieving the transaction from the API. This expiration window helps ensure the order remains profitable for solvers at the time of on-chain placement.