Wallet P&L Attribution

Matches sells against buys first in, first out and separates gains that have actually happened from gains that only exist while the price holds. Trades are sorted by date before matching rather than taken in paste order, since matching an unsorted list pairs the wrong lots and produces a realised figure that is simply wrong. Buy fees are folded into the cost basis, pro-rated across the portion of each lot actually sold, because ignoring them overstates every gain. Selling more than was ever bought is reported rather than silently treated as zero-cost, which would inflate the result dramatically. Not tax advice — rules differ and some jurisdictions require a different matching method entirely.