Square Inc.’s stock climbed after Chief Executive Jack Dorsey said the company is introducing bitcoin trading for almost all users of its cash payments app, signaling support for the volatile cryptocurrency.

“We support bitcoin because we see it as a long-term path towards greater financial access for all,” Dorsey, who also is CEO of Twitter Inc., said in a tweet Wednesday. “This is a small step.”

The service will be available to most customers of Square cash, with which users can transfer money to friends and family. Those in New York, Georgia, Wyoming or Hawaii are excluded.

The San Francisco company said that most of the purchases and sales happen within seconds, and that it won’t add an additional percentage or fixed dollar amount onto the sale of bitcoin. Users can buy as much as $10,000 worth of bitcoin per week, though there’s no limit to the number of bitcoins users can sell. One bitcoin currently trades for about $10,000.


Square shares rose $1.39, or 3.1%, to $46.91.

The market for bitcoin trading platforms is becoming increasingly crowded. Last week, stock-trading app Robinhood said it would roll out free bitcoin and ethereum cryptocurrency trading in five states. More than 1 million people have signed up for “early access” in the few days after the announcement. Square’s service will also compete with Coinbase, the largest U.S. marketplace for trading cryptocurrencies.

Integrating bitcoin trading into Square’s cash app isn’t without risk. The largest exchanges have suffered from slow trading as demand for crypto has skyrocketed. Coinbase has experienced performance issues, including outages, slow load times and a flash crash in ether, the second most valuable virtual coin.

Meanwhile, some companies have begun to distance themselves from the risky digital-currency market. On Jan. 23, payments start-up Stripe Inc. said it would be ending support for bitcoin payments because of long transaction times and high fees. And social network giant Facebook Inc. said Tuesday that it would ban ads that promote cryptocurrencies and initial coin offerings.


Wang writes for Bloomberg.