Coibase will support Bitcoin Segwit2X fork and will credit Bitcoin2X immediately to its customers. Following is statement from Coinbase on this fork:
“The Bitcoin Segwit2x fork is projected to take place on November 16th and will temporarily result in two bitcoin blockchains. Following the fork, Coinbase will continue referring to the current bitcoin blockchain as Bitcoin and the forked blockchain as Bitcoin2x.
Any customer with a Bitcoin balance on Coinbase at the time of the fork will be credited with an equal amount of the Bitcoin2x asset on the Bitcoin2x blockchain. No action is required—we will automatically credit your account. So, if you have 5 Bitcoin stored on Coinbase before the fork; you will have 5 Bitcoin and 5 Bitcoin2x following the event.