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Parameters
Important parameters and formulas on the Wing platform

## Collateral Factor in Flash Pool

The Collateral Factor is a parameter that limits the maximum amount a user can borrow using a specific asset as collateral. Each asset in the Flash Pools has specific values related to their risk, which influences how they are loaned and borrowed. The calibration of the parameters for Wing Project is more aggressive as the Wing ecosystem is mature with some educated users and liquidators. The table below shows the Collateral Factor of each asset.
For example, if a user supplied \$1,000 worth of pETH to Flash Pool (Ontology), the maximum amount this user can borrow (borrow limit) is
.

## Liquidation Bonus in Flash Pool

If a borrower's address reaches 100% of its borrow limit, the borrower's collateral assets will be liquidated. Liquidators can repay loans at the discounts listed below and thus earn liquidation bonus.

## Reserve Factor in Flash Pool

Reserve factor is a percentage of borrowers paid interest to be deposited in the Wing DAO Community Fund.

### Flash Pool (Ontology)

Asset Type
Collateral Factor
Liquidation Bonus
Reserve Factor
ONTd
60%
8%
20%
pwBTC
75%
8%
15%
prenBTC
75%
8%
15%
pUSDC
80%
5%
10%
pETH
85%
5%
15%
pDAI
80%
5%
15%
pUSDT
80%
5%
10%
pSUSD
80%
8%
20%
pNEO
50%
8%
20%
pUNI
65%
8%
20%
WING
40%
10%
30%
ONG
50%
8%
25%
pYFI
50%
8%
25%

### Flash Pool (Ethereum)

Asset Type
Collateral Factor
Liquidation Bonus
Reserve Factor
pWING
40%
10%
30%
oneWING
80%
10%
20%
pONT
60%
8%
20%
ETH
85%
5%
15%
USDT
80%
5%
10%
USDC
80%
5%
10%
DAI
75%
5%
15%
UST
55%
8%
20%
WBTC
75%
8%
15%
PAXG
50%
8%
20%
xICHI
35%
15%
30%
65%
8%
20%
UNI
55%
8%
20%
BAL
45%
10%
25%
SNX
50%
8%
25%
SUSD
60%
8%
20%
xSUSHI
50%
8%
25%

### Flash Pool (OEC)

Asset Type
Collateral Factor
Liquidation Bonus
Reserve Factor
WING
50%
10%
30%
ONTK
65%
8%
20%
OKT
65%
8%
20%
USDT
80%
5%
10%
USDC
80%
5%
10%
BTCK
75%
8%
15%
ETHK
85%
5%
15%
DOTK
60%
8%
20%
OKB
65%
8%
25%
60%
8%
20%
SUSHIK
50%
8%
25%
UNIK
60%
8%
20%
DAIK
75%
5%
15%

### Flash Pool (BSC)

Asset Type
Collateral Factor
Liquidation Bonus
Reserve Factor
WING
40%
10%
30%
ONT
60%
8%
20%
BTCB
75%
5%
15%
ETH
85%
5%
15%
BNB
75%
5%
15%
USDT
80%
5%
10%
BUSD
70%
5%
15%
USDC
80%
5%
10%
DOT
60%
8%
20%
65%
8%
20%
BCH
65%
8%
20%
XRP
65%
8%
20%
DAI
75%
5%
15%
60%
8%
20%
LTC
65%
8%
20%
DOGE
55%
8%
25%
CAKE
55%
8%
25%
FIL
60%
8%
25%

## Borrowing Interest Rate Model in Flash Pool

Annual Percentage Rate (APR) is the annual interest rate charged to borrowers.
In WIP-15, a kink point was introduced to the interest rate model. The new interest rate model before and after the kink point uses different formulas. The interest rate growth before the kink point is relatively slow, compared to a rapid increase after the kink point.
When the capital utilization rate is
$U$
, the corresponding interest rate is
$R$
. At the kink point
$k$
, the capital utilization rate is
$U_k$
. The basic interest is
$R_0$
, and the interest rate at the kink point is
$R_0+R_k$
. When the capital utilization rate is 100%, the interest rate is
$R_0+R_k+R_{100}$
.
The capital utilization rate and interest rate follow the model below:
$If\ U
$R=R_0+U/U_k*R_k$
$If\ U≥Uk:$
$R=R_0+R_k+(U-U_k)/(1-U_k)*R_{100}$
Where,
$R_0=1%$
$R_k=7%$
$R_{100}=100%$
$U_k=80\%$
For example,
when
$U=20\%$
,
$R=1\%+20\%/80\%*7\%=2.75\%$
.
when
$U=90\%$
,
$R=1\%+7\%+(90\%-80\%)/(1-80\%)*100\%=58\%$
.