This has been dubbed the "summer of quitting," and three neobanks are aiming to capitalize on the trend by developing apps that provide budgeting, invoicing and tax calculation to meet the specific needs of contract workers.

Fintech companies with narrow-purpose banking charters pose a safety-and-soundness risk and should be denied access to the payment system and other perks unless they meet the same strict regulatory criteria as traditional financial institutions, trade groups for banks and credit unions told the Federal Reserve.

Novus, a startup whose app helps consumers make environmentally conscious purchases, is using application programming interfaces provided by the two companies to expand quickly. The effort shows how open banking can extend the reach of small companies and create new business lines for larger ones.

Cullen/Frost Bankers will allow customers to access deposits two days early as traditional lenders look to drum up business by mimicking their financial-technology rivals.

Bliss, which is part of a suite of apps under development by the mobile technology company Euphoria.LGBT, is working with Jiko to offer a tailored savings account for transgender individuals preparing for their transition.

The company angered hundreds of customers when its software flagged their accounts as suspicious and suddenly cut them off, according to a ProPublica report. The episode illustrates the challenge shared by fintechs and banks of rooting out scammers without being overzealous.

The fintech company Wise rose in its debut following a direct listing on the London Stock Exchange, in the largest such deal ever, bolstering Brexit Britain’s capital-market hopes.

As the popularity of health savings accounts grew, the Chicago bank decided it needed a more competitive product that tracks spending and uses artificial intelligence to maximize benefits. The high-tech Lively will help BMO soup up its offering.

Europe has encouraged adoption with rules that put consumers in control of the way their data is shared among banks, fintechs and third-party vendors. Whether the U.S. can make similar progress without its own rules is unclear.