[keyle]

There are plenty of free data feeds, basically any exchange with a free account will offer you a lot of data for free, near real time. Some via REST calls, some via websocket. Some might also offer some daily numbers or hourly numbers going back a few months/years. A lot of that said data will be market-maker data, meaning it may diverge in time from the real exchange information.

I'm no expert but if you want REALLY up to date information with many ticks per second, you'll have to pay.

As for trading, you're either paying fees or paying by the spread (difference) between buy/sell.

There is no free lunch.