According to Techcrunch, Branch's free-to-download Android app is a kind of 'branchless bank for the next generation,' says founder and CEO Matt Flannery.

The app asks users for permission to access and analyze data stored in their phones, like how much money they spend each month on a mobile plan, or who they call most often. From this data, Branch.co learns and predicts who is likely to be a good borrower, and can give users a credit line from $2.50 to $500 in about 10 seconds.

The app works without asking users for a credit history like they'd need to get a credit card from a traditional bank.

Branch.co employs a team of six data scientists and engineers in San Francisco, with a larger team of 30 employees in Nairobi, Kenya.

Its app is gaining popularity with people who are sole proprietors and entrepreneurs, especially farmers, drivers and merchants, Mr. Flannery said, who can borrow as little as $2 up to a few hundred dollars to repay within a few days or a few weeks.

Previously, Flannery co-founded and was Chief Executive Officer of the non-profit lending platform Kiva.org.

Flannery said he chose to create Branch.co as a for-profit business because philanthropic fundraising can be a huge distraction for tech companies. And top engineering talent is attracted to organizations that offer competitive salaries and benefits, unusual for a non-profit.

'Our service is already reaching the middle class in Kenya,' Flannery said, 'But I'm building this with the intention that it will serve everyone much the way that Twitter started out as a thing that people used at South by Southwest, but ended up playing a big role in the Arab Spring.'

The Series A investment marks two firsts for Andreessen Horowitz: It's the first deal managed by General Partner Alex Rampell since he joined the firm, and the fund has never backed a U.S.-based company that serves Sub-Saharan Africa as its primary market.

Rampell said, 'Lots of entrepreneurs try to do things with financial services for un-banked or under-banked people in the U.S. and Western Europe, but this need is nowhere near what it is in the developing world.'

Even with apps like Square, Venmo, Apple Pay or Tilt available domestically, less than one-third of smartphone users in the U.S. said in a survey published last year by the Federal Reserve (Consumers and Mobile Financial Services 2015) that they made a payment via mobile phone.

By contrast, a majority of people who have mobile phones in Sub-Saharan Africa make payments with them as a going concern, especially via remittance platforms like M-Pesa.

Plus, smartphone adoption is on a meteoric rise there. GSMA Intelligence estimates Sub-Saharan Africa will add more than 400 million new smartphone connections by 2020, bringing the installed base to more than half a billion at that point.

Andreessen Horowitz was joined in the Series A investment by Branch.co's earlier seed backers, Khosla Impact Fund and Formation 8.