Sustainability-focused financial technology firm Aspiration Partners is going public through a deal with a special-purpose acquisition company that would value it at about $2.3bn, the companies said.

Marina del Rey, California-based Aspiration offers what it calls "sustainability as a service" - a suite of banking services, credit cards and investment products that are designed to keep deposits out of fossil fuels and generate other environmental benefits, for example by funding tree-planting with every card purchase.