To find the cheapest exchange, we looked at overall cost-effectiveness when buying BTC with fiat currency, including exchange commission fees, deposit and withdrawal fees, exchange costs and any other applicable fees. Purchases made with a credit card give you access to your bitcoin immediately. So, should you buy Bitcoin from a US exchange or from a foreign platform? Buy Bitcoin Worldwide is for educational purposes only. The following are some of the available options: Using a peer-to-peer platform like LocalBitcoins to trade directly with a Bitcoin seller.