See reward tokens / yield on Aura Pools
Select the pool, navigate to the Info tab and open the Rewards Contract Address in etherscan
Screenshot 2022-11-01 at 10.53.01.png rewardRate
is the reward rate for BAL per secondextraRewards(N)
is the contract address for additional rewards (outside of AURA, BAL, ie. LDO, bb-a-USD)AURA is minted pro-rata to BAL accrued.
The formula for determining how much AURA is emitted per BAL can be found here: https://etherscan.io/token/0xC0c293ce456fF0ED870ADd98a0828Dd4d2903DBF#code#F1#L85
A typescript implementation can be found here:
export const getAuraMintAmount = ( balEarned: number, global: Omit<Global, 'auraMinter' | 'auraMinterMinted'>, ) => { const reductionPerCliff = BigNumber.from(global.auraReductionPerCliff); const maxSupply = BigNumber.from(global.auraMaxSupply); const totalSupply = BigNumber.from(global.auraTotalSupply); const totalCliffs = BigNumber.from(global.auraTotalCliffs); const minterMinted = BigNumber.from(0); // e.g. emissionsMinted = 6e25 - 5e25 - 0 = 1e25; const emissionsMinted = totalSupply.sub(maxSupply).sub(minterMinted); // e.g. reductionPerCliff = 5e25 / 500 = 1e23 // e.g. cliff = 1e25 / 1e23 = 100 const cliff = emissionsMinted.div(reductionPerCliff); // e.g. 100 < 500 if (cliff.lt(totalCliffs)) { // e.g. (new) reduction = (500 - 100) * 2.5 + 700 = 1700; // e.g. (new) reduction = (500 - 250) * 2.5 + 700 = 1325; // e.g. (new) reduction = (500 - 400) * 2.5 + 700 = 950; const reduction = totalCliffs.sub(cliff).mul(5).div(2).add(700); // e.g. (new) amount = 1e19 * 1700 / 500 = 34e18; // e.g. (new) amount = 1e19 * 1325 / 500 = 26.5e18; // e.g. (new) amount = 1e19 * 950 / 500 = 19e17; let amount = simpleToExact(balEarned).mul(reduction).div(totalCliffs); // e.g. amtTillMax = 5e25 - 1e25 = 4e25 const amtTillMax = maxSupply.sub(emissionsMinted); if (amount.gt(amtTillMax)) { amount = amtTillMax; } return amount; } return BigNumber.from(0); };
A solidity library implementation can be found here (AuraMining): https://etherscan.io/address/0x744Be650cea753de1e69BF6BAd3c98490A855f52
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