how do you handle (or plan to handle) exchange operation types?
In practice, most currencies are actually liquid against the American dollar; and maybe a few other major coins. This is mostly a technical issue, since liquidity is fragmented and it is just easier to trade against what you know everyone else has: the all-dominant US Dollar [1].
Now, enough theory, how do we do it at Peanut?
Currently, all user balances at Peanut are dollarized; that means users hold USD stablecoins. This is a deliberate simplification; in the future, we plan to roll out other stablecoin support (especially important for Europeans. The rest of the world is pretty happy with holding USD).
When we have to do an exchange to a local currency, like Argentinian Pesos, we work with a local exchange provider. They are able to give us the best exchange rate, because we go directly from a USD-like stablecoin (USDC or USDT usually), to their currency.
For them, USDC & USDT are functionally equivalent to hard cash, and they price it accordingly. They also get it IMMEDIATELY; they don't have to wait multiple days until settlement and until we wire them the funds from some American or European Bank. This is much better for us than for other fintechs like Revolut or Wise; they have to have their own liquidity (and all the infra, compliance, and legal that that entails!)
In the future, I expect our exchange rates to get even better. As foreign exchange continues to grow ON chain, liquidity on chain will increase; until it is the largest (and thus CHEAPEST) exchange in the world.
[1] Note: with the slow end of Pax Americana under the current US regime, the adoption of US Dollar has actually been falling somewhat; replaced by sovereign nations and funds actually holding more gold instead of usd . That's also why we've seen gold at all time highs