Square, the mobile payments startup founded by Twitter creator Jack Dorsey, announced today that it has raised $27.5 million in a round led by Sequoia Capital. The Wall Street Journal reported that the funding valued the San Francisco startup at $240 million, which I confirmed with chief operating officer Keith Rabois.

TechCrunch previously reported that Square was closing a round from Sequoia at a $200 million valuation.

Becoming a truly mass-market company will be a4‚¬Aa big challenge,a4‚¬¯ Rabois acknowledged, but he pointed out that Square is already achieving impressive growth without paying for traditional advertising or other promotions. He said Square is processing millions of dollars in transactions every week, and that ita4‚¬a4„s signing up 30,000 to 50,000 new merchants every month. Rabois said many of those merchants were previously cash-only, but they were attracted by Squarea4‚¬a4„s ease-of-use (the card-reading device plugs into iPhones, iPads, and Android phones) and low financial risk (Square takes a small percentage of each payment, but the device is free, there are no upfront costs, and no long-term commitments) to start taking credit card payments for the first time.

Beyond the extra cash and impressive valuation, the funding also creates another connection between Square and the group of original PayPal executives who are known as the PayPal Mafia. Rabois joined Square from social startup Slide (which was itself led by PayPal co-founder Max Lecvhin), and he previously held executive roles at PayPal. Now Sequoia Capital partner Roelof Botha, who was PayPala4‚¬a4„s chief financial officer, is joining Squarea4‚¬a4„s board of directors. (Sequoia reportedly beat out Kleiner Perkins Caufield &' Byers and Benchmark Capital to lead the deal.)

Bringing those connections to Square seems particularly important, given the company ambitious plans for upending the payments industry. (Building out the financial infrastructure has already caused the company some delays.) Rabois compared the complications involved in building a service that works with existing financial institutions and regulations to building a spaceship.

Rabois acknowledged that he and Boetha are connected through PayPal, but he also said that Sequoia has a long history of investing in financial service companies. Sequoia&'s partners are also a4‚¬Aproduct and design connoisseursa4‚¬¯, he said, which makes them a good fit for Squarea4‚¬a4„s goal of making payments seem a4‚¬Amagicala4‚¬¯.

Khosla Ventures, which led Square&'s $10 million first round of financing, also invested in the new round.

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Tags: mobile payments

Companies: Khosla Ventures, Sequoia Capital, Square

People: Jack Dorsey, Keith Rabois, Roelof Botha

Tags: mobile payments

Companies: Khosla Ventures, Sequoia Capital, Square

People: Jack Dorsey, Keith Rabois, Roelof Botha

Anthony is a senior editor at VentureBeat, as well as its reporter on media, advertising, and social networks. Before joining the site in 2008, Anthony worked at the Hollister Free Lance, where he won awards from the California Newspaper Publishers Association for breaking news coverage and writing. He attended Stanford University and now lives in San Francisco. Reach him at anthony@venturebeat.com. (All story pitches should also be sent to tips@venturebeat.com) You can also follow Anthony on Twitter.

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