My best guess is that they are using past history, so last week someone mining would have income of $203.58, but past day only $23.41 That would explain why the monthly is so far off also...
Can someone explain to me how Nicehash comes up with those numbers? If for instance, I do 23.41/day * 7(week) = 163.87. Now where 203.58 USD come from. This is just one example. Thanks for the explanation.
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Please note that these values are only estimations - real values can be lower or higher. Exchange rate of 1 BTC = 5715.4 USD was used.
I can't find it now, but IIRC they use the data from the last 24 hours.