Some are saying the crazy-good times for cryptocurrency traders may be over. December was undoubtedly a huge month for cryptocurrency trading. Bitcoin hit its all-time high above $19,000 a coin. For the first time, daily volumes for crypto trading soared over $50 billion. It was also a golden age for arbitrage trading. Arbitrage is when a trader buys an asset trading in one market at a lower price and then sells it at a premium on another market.