Upvest is a company that offers an Investment API, allowing users to build investment experiences. Their services include financial brokerage, proprietary trading, securities custody, and crypto custody. Upvest enables account creation, execution of trades, and generation of digital reports. They offer various investment experiences such as fractions, portfolio customization, saving plans, and roundups. Upvest serves as a fintech infrastructure provider, helping businesses develop investment use cases and integrate securities into their products.