Stablecoins became crypto's biggest mainstream breakthrough in 2025. Half a dozen projects surpassed the $1 billion valuation mark, while the entire sector expanded 50% to reach $305 billion. Here's what really stands out: annual transaction volume climbed to $33 trillion—more than double Visa's throughput. As institutional and retail adoption accelerates, on-chain stablecoin metrics are emerging as genuine indicators of global liquidity flows and macroeconomic trends. This shift signals a fundamental change: what happens in crypto corridors could start reflecting real-world economic dynamics.