@corwinharrell, the APY is an "annual percentage yield" used to measure the interest rate.

Calling it APY can be tricky, as pools (see Aurora) might take $near, keep fees at 100%, and give back only Aurora tokens, which would yield 0% APY in $near tokens and a certain amount of $aurora tokens (or any other similar fungible token).

Example 1:

Aurora Pool takes 100% staking fees, offering 1,000,000 $aurora tokens over 12 months. They received already 190,000 $near staked, out of a grand total of 400,000,000 $near currently staked in the network
the user Alice stakes 10,000 $near, corresponding to 5% of the total of 200,000 $near staked in the pool
Alice's $near APY will be 0%, since Aurora Pool keeps 100% of the protocol rewards
$aurora Annual Yield will be 5% of 1,000,000 or 50,000 $aurora tokens >> this is because Alice holds 5% of all funds staked into the Aurora Pool
as of today, 1 $aurora is 0.59825470 $near, so the Annual Yield equivalent is (50,000 * 0.598)=29,900 $near
Alice's cumulative APY would be 0% $near from protocol rewards + (29,900/10,000)=299% from the $aurora fungible token rewards

Example 2:

Paras Pool takes 50% staking fees, offering 20,000,000 $paras tokens over 12 months. They received already 990,000 $near staked out of the 400,000,000 $near currently staked in the network
the user Bob stakes 10,000 $near, corresponding to 1% of the total of 1,000,000 $near staked
Bob's $near APY will be half of the protocol rewards, or (0.5 * 0.1125)=5.625%, since Paras Pool takes 50% or 0.5 in fees
$paras Annual Yield will be 1% of 20,000,000 or 200,000 $paras tokens
as of today, 1 $paras is 0.019 $near, or an Annual Yield equivalent of 3,800 $near
Bob's cumulative APY would be 5.625% $near from protocol rewards + (3,800/10,000)= 38% from the fungible tokens

Example 3:

Bison Trails Pool takes 10% staking fees, not offering fungible tokens. They received already 19,990,000 $near staked out of the 400,000,000 $near currently staked in the network
the user Charlie stakes 10,000 $near, corresponding to 0.05% of the total staked in the pool
Charlie's $near APY will be 90% of the protocol rewards since Bison Trails keep 10% in fees, or ((1-0.1)*0.1125)=10.125%
no fungible tokens are distributed by Bison Trails, so there are no additional Annual Yield to calculate
Charlie's cumulative APY would be 10.125% from protocol rewards, and nothing else

Notes:

We simplified to a constant of 11.125% APY for the staking on the protocol, coming from the standard rewards of 4.5% over 1 billion tokens of supply, applied to 400 million $near staked
We simplified the fungible tokens annual yields, since some pools may have a release schedule that is shorter than 12 months, so the APY (annual, 12 months) is lower
The current calculation here is using USD as the unit of account instead of $near, which is faster to implement but requires to know the fungible token values in USD
this calculation won't take into account the $near, $aurora and $paras exchange fluctuations: the 299% APY might change dramatically if the $near tokens and/or the $aurora token USD value increase or decrease in the double digit.

Will need an ack by @ilblackdragon to make sure we are all on the same page in terms of UI

Create the new version of UI/UX for displaying APY for farming validators #2539

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