Contract template

Crowdfunding with quotas

The crowdfunding token means that after the token is issued, any address can purchase tokens from the crowdfunding address using ETH.

The exchange ratio between token and ETH is set at the same time as the contract is deployed.

All crowdfunding contracts must be deployed after an ERC20 token has been successfully deployed, and a fixed amount of ERC20 contracts has been set in the deployment script

Quota crowdfunding means that accounts that buy tokens must set quotas before they can buy tokens

Contract Document: IndividuallyCappedCrowdsale.sol (opens new window)

Test script: IndividuallyCappedCrowdsale.js (opens new window)

Deployment script: 12_deploy_IndividuallyCappedCrowdsale.js (opens new window)

Define the following variables when deploying the contract

uint256 rate               //how many ERC20 tokens are exchanged for 1ETH
address payable wallet     //to receive ETH beneficiary's address
IERC20 token               //token address
address tokenWallet        //Tokens are sent from this address

ERC20 method needs to be implemented after the crowdfunding contract is placed

//Tokens in the sender's account must be approved for crowdfunding contracts after deployment
token.approve(crowdsale.address, SOME_TOKEN_AMOUNT);

Calling methods

//Return the token address
token() public view returns (IERC20)          
//return the beneficiary's address            
wallet() public view returns (address payable)              
//Return the exchange ratio
rate() public view returns (uint256) 
//Return sales
weiRaised() public view returns (uint256)         
//The token is purchased and sent to the specified address        
buyTokens(address beneficiary) public nonReentrant payable  
//Special method
//Return the existing address of the token
tokenWallet() public view returns (address)                 
//Check the number of tokens left in the quota
remainingTokens() public view returns (uint256)
//Set the maximum number of accounts, in bits
setCap(address beneficiary, uint256 cap) external onlyCapper
//Get the quota of the specified account
getCap(address beneficiary) public view returns (uint256)
//Obtain the ETH quantity provided by the specified account
getContribution(address beneficiary) public view returns (uint256)
//Returns whether the specified account has the permission to set quotas
isCapper(address account) public view returns (bool)
//Add quota permission to the specified account
addCapper(address account) public onlyCapper
//Cancel the quota setting permission of the current account
renounceCapper() public