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Niklas Feurstein
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I wanted to give a quick update on this topic. (The other answers with prices are kinda outdated).

Same as the other answer a kilobyte of data is 640k gas.

But in contrast to two years ago the gas price is now ~10 gwei instead of 50 gwei.

However the price of ETH also increase.

Two years ago it would cost you $0.076/KB.

Nowadays it costs you $1.204/KB.

Niklas Feurstein
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