Whether sending international payments, budgeting travel expenses, or invoicing cross-border clients, understanding the mechanics of currency exchange rates protects you from hidden fees. ### What is the Mid-Market Rate? The mid-market rate—also known as the interbank rate—is the midpoint between the buy (bid) and sell (ask) prices established by major global banks trading high-volume currencies on wholesale foreign exchange markets. It represents the purest, unbiased benchmark valuation of one currency against another. ### How Retail Markups and Spreads Work When you convert money through a commercial bank, credit card issuer, or airport foreign exchange kiosk, you rarely receive the pure mid-market rate. Financial institutions introduce a "spread" or hidden markup—typically adding between 1.5% and 4% above the benchmark rate, in addition to standard wire or transaction fees. ### Official Central Bank Benchmarks Zoviva’s Currency Converter and Currency Calculator rely on benchmark exchange rates published daily by the European Central Bank (ECB) via the open-source Frankfurter API. These rates reflect official institutional closing prices without commercial retail markups, providing an impartial, transparent baseline for comparing quotes and verifying transaction costs.