Circle closed with an $18.4 billion valuation, well below Coinbase’s IPO but ahead of newer entrants like Fold and eToro.

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.