MENLO PARK, July 2 -- Robinhood Markets Inc. HOOD turned on the blockchain it built itself Wednesday, and with it came three products no regulator has yet had a chance to weigh in on: an AI trading agent with access to customer accounts, a lending pool advertising 7 percent yield with none of the deposit insurance a bank offers, and a stock market that never closes.

The launch, four months after Robinhood opened the network to public testing, turns the company's crypto side business into infrastructure for the rest of the platform. Stock tokens tracking US equities are now live through Robinhood Wallet in more than 120 countries, availability varying by jurisdiction. A UK crypto launch and a Canadian expansion, the latter following Robin...