OLD: V1-V2 Pools

This page refers to the information about old V1-V2.1 pools.
The pools below are the old V1-V2.1 ones.

How was APY calculated in V1-V2.1?

Capital is required for traders and farmers to get leverage for their financial operations. For this, there are Liquidity Pools: anyone can become a liquidity provider by supplying assets in the Liquidity Pool. The profitability of LPs depends on the pool utilization ratio U - the higher utilization, the higher interest rate. See a bit more on the Protocol Fees page.
Borrow APY is calculated according to formula
r(t)={r0+U(t)U1(r1r0),U(t)U1r1+(U(t)U2)r2r1U2U1,U(t)(U1,U2].r2+(U(t)U2)r3r21U2,U(t)>U2.r(t) = \begin{cases} r_0 + \frac{U(t)}{U_1}\left(r_1-r_0\right), & U(t) \le U_1\\ r_1 + \left(U(t)-U_2\right)\frac{r_2-r_1}{U_2-U_1}, & U(t) \in (U_1,U_2].\\ r_2 + \left(U(t)-U_2\right)\frac{r_3-r_2}{1-U_2}, & U(t) > U_2.\\ \end{cases}
Asset pool
r_0
r_1
r_2
r_3
U_1
U_2
USDC
0
1
1.25
100
70
90
DAI
0
1
1.25
100
70
90
FRAX
0
1
1.25
100
70
90
wstETH
0
2
2.5
60
70
90
ETH
0
2
2.5
60
70
90
WBTC
0
2
2.5
60
70
90
Latest update 2: governance updated interest rate curve to two-point model.
Latest update: governance voting to change pool interest rate curve parameters and make the curve more flat as a bootstrap mechanism for V2 Leverage Ninja launch. See the logic.

V2-V2.1 Pool Caps

Asset
Pool max
Min pers borrow
Max pers borrow
USDC
N/A
60,000 USDC
1,000,000 USDC
DAI
N/A
60,000 DAI
1,000,000 DAI
FRAX
N/A
100,000 FRAX
1,000,000 FRAX
wstETH
N/A
75 wstETH
600 wstETH
WETH
N/A
30 WETH
600 WETH
WBTC
N/A
2 WBTC
50 WBTC
Latest update: pool limits are effectively lifted. Any actual caps are just required by the architecture to have *some* number and can be lifted without a vote if the TVL approaches them. As for the min-max personal borrow limits, they have been established by another vote: GIP-21, then GIP-71.