User

User

1. Buy options

The user calls OptionV2->buyOption() link , requesting parameters:

• uint256 _indexNo index ID,

• uint8 _poolId option pool ID,

• uint256 _position The position of options purchased,,

• bool _isCall call:true,put:false,

• uint256 _price option purchase price,

• uint256 _datetime signature valid time,

• bytes calldata _signData signature data

Before the user purchases, request the interface buy-sign link.After requesting the interface, the return parameterssignsignData ,price ,date-time passed into the contract, and the user selects the option product to buy call/putoption to obtain index_no, poolId. _payToken, which needs to be configured inaallowPayToken, and _signData obtained through the interface/api/defi/option/order/buy-sign link . Please note that the signature is only valid within 2 minutes, after it is generated.

2.Sell options

The user callsOptionV2->sellOption() link to sell the user share back to the market maker, parameter list:

• uint256 _orderNo sell option contract ID

• uint256 _position sell quantity

• uint256 _price selling price

• uint256 _datetime Signature valid time

• bytes calldata _signData signature data

Before selling, the user requests the interface sell-sign link to obtain the parameters signData ,price ,datetime ;

Close position price rule

_price is calculated by the option pricing formula, and the final selling price needs to be multiplied by the OptionV2->sellPriceRate rate. The pledged margin is returned to the market maker's margin balance.

3. Exercise options at maturity

The user callsOptionV2->userExercise()to calculate the user profit and obtain it. If the share is a call option, the profit =position * (exercise_price-open_price), if it is a put option, the profit = position (exercise_price-open_price). The user's profit will be issued to the user in real time, and the market maker will liquidate through OptionV2->makerExercise()

4.Knock out

The user calls OptionV2->userKnockOut() for knockout liquidation. If OptionV2->knockoutRebate>0, user profit = buy_price * knockoutRebate /1.