'Is there a way to convert a specified amount of gwei to ETH/USD in a contract without using formulas everytime?

function getConversionRate(uint256 ethAmount) public view returns (uint256) {
    uint256 ethPrice = getPrice();
    uint256 ethAmountInUsd = (ethPrice * ethAmount) / 1000000000000000000;
    return ethAmountInUsd;

This is how I currently am converting gwei to ETH/USD, but if I increased my specified amount of gwei in my function in Remix IDE. The formula would have to be changed manually. Is there a way to automate this? OR is there an API that I could import that will do this for me if I made a function that called on that?

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'Is there a way to convert a specified amount of gwei to ETH/USD in a contract without using formulas everytime?

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