Mint Club
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Buy & Sell
This is an example of buying / selling tokens.

Constants

Following are the constant values used in examples below:
export const BIG_TEN = new BigNumber(10);
export const DEFAULT_TOKEN_DECIMAL = 18;

Buy

Buy contract call is as follows:
mintClubBondContract.buy(
tokenAddress,
amount,
minReward,
beneficiary,
);
In order to calculate the minReward, we utilize the getMintReward function from mintClubBondContract.
const contract = getMintClubBondContract();
const result = await contract.getMintReward(
tokenAddress,
truncateDecimals(new BigNumber(mintAmount).times(BIG_TEN.pow(DEFAULT_TOKEN_DECIMAL)).toString(), 0),
); // here mintAmount is amount of mint user is willing to spend
const outBN = new BigNumber(result[0].toString());
const minReward = truncateDecimals(
outBN
.times((100 - 2 /* slippage percentage */) / 100)
.toFixed(0, 1)
.toString(10),
0,
);
truncateDecimals is a number helper function:
export function truncateDecimals(num, digits = 18) {
const str = num?.toString();
if (str?.includes('.')) {
const numbers = str.split('.');
const decimals = numbers[1];
if (digits === 0) {
return numbers[0];
} else if (decimals.length > digits) {
return `${numbers[0]}.${numbers[1].toString().substring(0, digits)}`;
}
return num;
}
return num;
}
With the calculated values, we can now call the contract:
import { AddressZero } from '@ethersproject/constants'; // use null address if there is no referrer wallet address
const tx = await mintClubBondContract.buy(tokenAddress, buyAmount, minReward, referrerWalletAddress);

Sell

Sell contract call is as follows:
mintClubBondContract.sell(
tokenAddress,
amount,
minRefund,
beneficiary,
);
In order to calculate the minRefund, we utilize the getBurnRefund function from mintClubBondContract.
const contract = getMintClubBondContract();
const result = await contract.getBurnRefund(
tokenAddress,
new BigNumber(amount).times(BIG_TEN.pow(DEFAULT_TOKEN_DECIMAL)).toString(),
); // here amount is amount of token user is willing to sell
const outBN = new BigNumber(result[0].toString());
const minRefund = outBN
.times((100 - 2 /* slippage percentage */) / 100)
.toFixed(0, 1)
.toString(10);
With the calculated minRefund value, we can now call the sell function on mintClubBondContract.
import { AddressZero } from '@ethersproject/constants'; // use null address if there is no referrer wallet address
const tx = await mintClubBondContract.sell(tokenAddress, sellAmount, minRefund, referrerWalletAddress);
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Constants
Buy
Sell