This is because of MiFID legislation (known as Directive 2014) which is aimed at creating more transparency and protection for traders. Some may periodically offer incentives of free trades if you open an account with large deposits although since 2018, platforms based in the EU are now prohibited from offering bonus incentives to open accounts. This is usually anything from around $50 upwards. Almost all online brokers are free to sign-up for but require a minimum deposit before you can trade.There’s a few useful things to be aware of before you sign-up with any trading platform. Day Trading Platforms For Mac Essentials.