Prices and exchange rates are scaled by the decimals unique to each asset; rTokens are ERC-20 tokens with 8 decimals, while their underlying tokens vary, and have a public member named decimals.

rToken	rToken Decimals	Underlying	Underlying Decimals
rTT	8	TT	18
rBUSD	8	TT-BUSD	18
rUSDC	8	TT-USDC	6
rUSDT	8	TT-USDT	6
rETH	8	TT-ETH	18
rWBTC	8	TT-WBTC	8
rBNB	8	TT-BNB	18

Calculating Accrued Interest

Interest rates for each market update on any block in which the ratio of borrowed assets to supplied assets in the market has changed. The amount interest rates are changed depends on the interest rate model smart contract implemented for the market, and the amount of change in the ratio of borrowed assets to supplied assets in the market.

Interest accrues to all suppliers and borrowers in a market when any ThunderCore address interacts with the market’s rToken contract, calling one of these functions: mint, redeem, borrow, or repay. Successful execution of one of these functions triggers the accrueInterest method, which causes interest to be added to the underlying balance of every supplier and borrower in the market. Interest accrues for the current block, as well as each prior block in which the accrueInterest method was not triggered (no user interacted with the rToken contract). Interest compounds only during blocks in which the rToken contract has one of the aforementioned methods invoked.

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Last updated 3 years ago