Run the currency exchanges in high orecision

The pit boss keeps his bit error at less than 1% per trade, typically. The outer bound is a 2% bound.

So all y==the trading bots know the currency trades are six bit precision.The bots will see a rank six double stack.  The pit boss is making the window are enough to keep risk lowest, so there needs to be congested flow, or the pit boss will go belly up. Thus kind of precision leads to fewer exchanges competing, but FX is meant to be precise, it is the foreign exchange ledger service, an outcome*,  and feeds directly to the asset/liability accounts.

* outcome- something computed in the economy that needs an account adjustment on the currency ledger service. The necessity of recording makes it a result, a result likely  anticipated by a smart contract.