Feels like a mix of Open Sans and Source Sans Pro. These were all over the web about 12 years ago. They got well with Montserrat in all caps and Merriweather: https://www.fubiz.net/

Whitney was the main font of Stripe when Benjamin De Cock initially redesigned the brand. It was one of the most beautiful websites I'd ever seen (and still is): https://dribbble.com/shots/2974913-Home