# Swap Contract

## 1. swapFil

Users use SFT to exchange FIL, that is, a redemption operation. When the FIL balance in the contract is insufficient, the contract borrows FIL from the borrowing pool to meet the user's redemption needs (see the above [**7. borrowLiquidity**](https://sftprotocol.gitbook.io/sft-chain/technical-documentation/lendingpool-contract#7.-borrowliquidity) method for details).