Fidelity Investments is testing its own U.S. dollar-pegged stablecoin, positioning itself as a competitor to Tether, Circle, and Ripple.The stablecoin will be managed through Fidelity's digital assets division and will serve as a cash equivalent within cryptocurrency markets.Fidelity's move reflects the trend of traditional financial institutions embracing digital assets and tokenization.The stablecoin market is projected to reach $2.8 trillion in the next five years, with USDT and USDC dominating the market.