Three regulated stablecoins by Paxos, Circle and Gemini are directly competing against each other. Paxos ($PAX) is taking an early lead in terms of circulating supply, while USD//Coin ($USDC) has been trailing. The Gemini Dollar ($GUSD) has not been able to compete so far. In just the last four days, Paxos has doubled its circulating supply while USD//Coin remained stable.