Because there are ways to transfer cryptocurrencies between CEXes, you don't necessarily have to deposit fiat onto a CEX that has ALPACA listed. For example, you can deposit fiat into an FTX account, convert it to USDT, and transfer the USDT to a Binance.com account (via the Tron network for $1), where you can then buy ALPACA. Popular CEXes not listed above include Coinbase, Crypto.com, Kraken, Gemini, Huobi, OKEx, WazirX, Bitfinex, Bithumb, and Bitstamp.