# 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](https://3372224363-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fr4kLuYPt1EhIEVbkxHD8%2Fuploads%2FyBVQE4lEzn0qPlbiIgPU%2FScreenshot%202022-11-01%20at%2010.53.01.png?alt=media\&token=0f65d19b-1a4c-4215-b20c-74dd2650fea2)

  * `rewardRate` is the reward rate for BAL per second
  * `extraRewards(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:

    ```tsx
    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>