Square Inc. (SQ) customers were left pleasantly surprised this past week after the mobile payment solutions provider gave a small number of its Cash app users the option to buy or sell Bitcoin.

News that Square is trialling transactions with the digital currency prompted several users of the app to voice their enthusiasm for the idea on Twitter. Shortly after, the company came out with a statement confirming its intentions. (See also: Square's Market Cap Is Now Bigger Than Twitter's.)

“We’re always listening to our customers and we’ve found that they are interested in using the Cash app to buy Bitcoin,” a Square spokesperson said in a statement, reported on by TechCrunch. “We're exploring how Square can make this experience faster and easier, and have rolled out this feature to a small number of Cash app customers.”

The spokesperson added: “We believe cryptocurrency can greatly impact the ability of individuals to participate in the global financial system and we're excited to learn more here.” (See also: How Square Cash Works and Makes Money.)

Square didn't confirm who it is using as a liquidity partner for transactions during its trial period. The payment app also didn’t reveal if and when it will roll out an official app to all users wishing to trade the digital currency. As a result, no details about potential fee structures or daily buying and selling limits were provided.

The current trial version only enables users to buy, sell and hold Bitcoins, meaning that they cannot make payments to friends with the cryptocurrency.

According to TechCrunch, the trial uses a very basic interface. Customers wishing to access it must swipe right from the Cash Card page. Once there, they are presented with both a U.S. dollars and Bitcoin balance, buy and sell buttons and a graph showing performance over the last day, month or year.

There is also reportedly an option to generate a wallet address. However, TechCrunch added that the balance it checked when clicking on one wallet address didn’t match that particular user’s Bitcoin holdings. That revelation led it to assume that Square is using pooled wallets to hold user funds.

There have also been reports that Square’s Bitcoin offering doesn’t function properly. One source told TechCrunch that a previously executed transaction had yet to show up in his balance.

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