Why not ask the exchanges themselves?
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Not all exchanges are created equally in this category. Frankly, OTC desks of exchanges can answer this question best. Kevin at is likely best source for current vs past.
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We collect enough fees in fiat to pay the bills and rarely make trades.
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True hodlerβer.
This means you keep basket of all assets traded on exchange b/c you earn fees based on pairing?
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We keep a basket for our insurance fund and for margin pool.