The borrow function transfers an asset from the protocol to the user, and creates a borrow balance which begins accumulating interest based on the Borrow Rate for the asset. The amount borrowed must be less than the user's Account Liquidity and the market's available liquidity. To borrow Ether, the borrower must be 'payable' (solidity).

FBep20 / FBnb

function borrow(uint borrowAmount) returns (uint)
  • msg.sender: The account to which redeemed funds shall be transferred.

  • redeemAmount: The amount of underlying to be redeemed.

  • RETURN: 0 on success, otherwise an Error Code.


FBnb fToken = FBnb(0x3FDB...);
require(fToken.borrow(100) == 0, "got collateral?");

Web3 1.0

const fToken =;
await fToken.methods.borrow(50).send({from: 0xMyAccount});

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