This week’s blockbuster IPO of Circle, a leading issuer of stablecoins, shows how crypto is increasingly going mainstream. Here’s how to invest.

Circle Internet Group Inc.’s white-hot debut on Thursday gives the US IPO market a crypto-fuelled shot of adrenalin that could encourage more listings by would-be debutantes — in the digital assets space and beyond.

What exactly does Circle do, and why did it decide to move its headquarters from downtown Boston to lower Manhattan late last year? Here are six things to understand about the company, which manages a "stablecoin" called USDC.