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

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.

Circle, which produces the USDC stablecoin, reached $1.05 billion in its eagerly awaited U.S. initial public offer (IPO). By offering 34 million shares for