How were different currencies dealt with by international traders? (Anytime pre 1900)

by [deleted]
Searocksandtrees

Could you specify which region/cultures you're interested in, and perhaps a timeframe? That might help guide the relevant historians in finding some examples.

Meanwhile, here are a few posts that may be of interest

What were exchange rates like in the Middle Ages like? And additional questions

Were there exchange rates in the Medieval times?

The logistics of being Ibn Batuta (and in general travelling around in medieval times)