Circle, the stablecoin operator behind USDC, saw its shares soar 235% on its first day of trading on the New York Stock Exchange.The company's valuation reached nearly $19 billion, and its cofounder became a billionaire overnight.Circle's IPO raised over $1 billion and had major demand from institutional investors like J.P. Morgan, Citigroup, and Goldman Sachs.This milestone IPO makes Circle the first stablecoin issuer to list publicly, marking mainstream validation of blockchain-based payment tools.