But the transaction fee is not 1% if you are a professional. It’s now higher, but there was a time you could easily get closer to 0.05% with some effort and non

But the transaction fee is not 1% if you are a professional. It’s now higher, but there was a time you could easily get closer to 0.05% with some effort and nontrivial but not huge volume. Iirc, last I checked, bitmex cost 0.075% to take liquidity, and paid 0.025 to give liquidity (which should be noted, is more than a tick - so, market making on bitmex is free money in an unpredictable market - which has made it technically expensive) INET had a similar incentive structure before they were bought by Nasdaq, as did BATS when it started - it’s a common way to jumpstart liquidity in a new exchange. Robinhood and IB will let you trade for free today (with other hidden and hard to quantify costs related to their order flow transactions instead) So there’s no general solution - the details keep changing - but there’s likely a way to make nice profit of 0.1%.