We do out very best to choose a well-known and respectable external liquidity pool provider, where we expect fair exchange rates. However, we cannot guarantee it to 100%. The Fiat24 money exchange is a service available to Fiat24 users, and we do not use a market maker for it. In consequence, the exchange rate follows the rules of supply and demand in the market. If for some reason the exchange rate considerably deviates from a fair value, we expect Fiat24 users to use arbitrage opportunities and eventually reinstate a fair and stable exchange rate.