Spark, a DeFi protocol, has announced its integration with BitGo, a leading digital asset custodian, to enable users holding stablecoins like USDC and USDT to earn yield on idle capital. This move addresses a common issue where funds remain stagnant in custodial accounts without generating returns. Spark's integration allows stablecoin holders to earn without moving assets out of qualified custody, leveraging Spark's robust balance sheet and its position as a sub-DAO of Sky, formerly MakerDAO. Sam MacPherson, CEO of Spark, highlighted the competitive landscape, noting that traditional banks resist offering yields on stablecoins to maintain high margins. The integration with BitGo is seen as a strategic move to challenge this status quo, especially in light of the GENIUS Act, which restricts stablecoin issuers from paying interest directly. MacPherson predicts a significant expansion in the stablecoin market, expecting it to grow from $300 billion to $3 trillion in the coming years, as major banks are anticipated to launch their own stablecoins.