Each asset supported by Ironlend is integrated through an rToken contract, which is an EIP-20 compliant representation of balances supplied to the protocol. By minting rTokens, users:
(1) earn interest through the rToken's exchange rate, which increases in value relative to the underlying asset, and
(2) gain the ability to use rTokens as collateral.
These rTokens are the primary means of interacting with IronLend. When a user mints, redeems, borrows, repays a borrow, liquidates a borrow, or transfers rTokens, he will do so by using the rToken contract.