As you have already seen, a broker needs to offer the right crypto CFD trading platform so that you have the tools to analyse the markets. Other qualities are also extremely important.
The crypto trading and CFD industries have many trustworthy brokers, markets, exchanges, and platforms. However, you will also find instances of sites that do not deliver promised services or engage in outright fraud.
For these reasons, the first step when selecting a broker for CFD trading cryptocurrency is to always look for two things: regulation and transparency. The site should be clear about the terms, bid/ask spreads prices, account minimums, and leverage ratios. Second, they should be accredited by one of their country's financial regulators.