Increasing Price Crowdsale

jeissoni · October 29, 2020, 6:51pm

Good evening

The contract (IncreasingPriceCrowdsale.sol) allows to have the functionality of a gradual price increase. My question is: is there a way to increase the price on certain dates? for example, every 5 days the price increases. Can this be done? Could you share an example with me?

Thank you very much.

abcoathup · October 29, 2020, 11:01pm

Hi @jeissoni,

Yes you can create price increases on certain dates.

You could take the ideas from IncreasingPriceCrowdsale, extend Crowdsale and in a getCurrentRate function specify the rate after specific times.

github.com

OpenZeppelin/openzeppelin-contracts/blob/v2.5.1/contracts/crowdsale/price/IncreasingPriceCrowdsale.sol#L58


 */
function finalRate() public view returns (uint256) {
    return _finalRate;
}

/**
 * @dev Returns the rate of tokens per wei at the present time.
 * Note that, as price _increases_ with time, the rate _decreases_.
 * @return The number of tokens a buyer gets per wei at a given time
 */
function getCurrentRate() public view returns (uint256) {
    if (!isOpen()) {
        return 0;
    }

    // solhint-disable-next-line not-rely-on-time
    uint256 elapsedTime = block.timestamp.sub(openingTime());
    uint256 timeRange = closingTime().sub(openingTime());
    uint256 rateRange = _initialRate.sub(_finalRate);
    return _initialRate.sub(elapsedTime.mul(rateRange).div(timeRange));
}

The Crowdsales documentation can be found here: https://docs.openzeppelin.com/contracts/2.x/crowdsales

abcoathup · November 2, 2020, 2:03am

Hi @jeissoni,

Let me know if you have any questions.

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Increasing Price Crowdsale

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