FTX is an international crypto exchange that provides services in many regions across the globe. The referral code is valid in all regions FTX operates, including the US, UK, European Union, and many other countries. These codes can only be used once – during the signup process – and they are used to promote the Swyftx platform on the web. The referral code, on the other hand, is a permanent Swyftx offer. Promo codes are usually found on websites dealing with special offers, coupons, and discounts.