Yesterday's launch of Bitcoin Cash was ridiculous and the price went up like crazy! It is suspected that this may be due to insider trading at Coinbase. Below are links to some articles to keep you up-to-date on the situation.
https://gizmodo.com/coinbase-freezes-bitcoin-cash-trades-launches-insider-1821460189
https://www.theverge.com/2017/12/20/16800940/coinbase-bitcoin-cash-fork-insider-trading-probe
https://techcrunch.com/2017/12/20/coinbase-bch-bitcoin-cash-api-reddit/