Hey, I work at at Mondo. We're building a startup retail bank with an API for developers.

You can find our API documentation here: https://getmondo.co.uk/docs

The APIs will be publicly available to developers and account holders. We've only just started rolling out our first cards, though, so we're not on boarding many third party developers at the moment.

If you'd like to play around with the API, send an email to developers@getmondo.co.uk and we'll see what we can do :)