Coinbase Global Inc., Gemini Trust Co., and Robinhood Markets Inc. are among firms helping to build a platform to comply with a U.S. money-laundering rule as cryptocurrency and financial-technology companies seek to satisfy existing requirements and head off stricter oversight.

A group of 18 companies is setting up the platform to help meet conditions of the U.S. Treasury Department's "travel rule," which requires financial firms to pass on information including customer names, account numbers, and transaction dates of funds transfers. The coalition has held talks with U.S. and global regulators about their plan, said Elena Hughes, chief compliance officer of crypto platform Gemini.

"We believe that the solution will allow for top-tier compliance for the travel rule, and we are looking to get buy-in from our regulatory authorities," Hughes said in an interview.