1. Institutional Trust and Regulatory Compliance

USDC has emerged as the dominant payment rail for Real-World Asset (RWA) transactions due to its alignment with institutional regulatory requirements, its role as the primary liquidity bridge for major tokenized funds, and its superior transaction velocity compared to other stablecoins. While USDT maintains a higher total market capitalization, USDC leads in settlement volume, processing $18.3 trillion in 2025 compared to USDT's $13.3 trillion.

1. Institutional Trust and Regulatory Compliance

The primary driver for USDC's dominance in the RWA sector is its "compliance-first" architecture, which is a prerequisite for institutional participation.

• Regulatory Milestones: In July 2024, Circle became the first global stablecoin issuer to achieve full compliance with the EU's MiCA (Markets in Crypto-Assets) regulation. It is also positioned as a leader under the GENIUS Act (2025), which established a federal framework for payment stablecoins in the U.S.
• Transparency: USDC provides monthly attestations from Deloitte and maintains 100% backing in cash and short-term U.S. Treasuries managed by BlackRock.
• Custodial Support: Major institutional custodians, including Anchorage Digital, BitGo, and Fireblocks, provide native support for USDC, facilitating its use in B2B and RWA settlement.

2. The "BUIDL" Effect and Ecosystem Integration

USDC serves as the essential liquidity layer for the world's largest tokenized treasury fund, BlackRock’s BUIDL (exceeding $2.6B AUM).

• Instant Redemptions: Circle launched a dedicated smart contract allowing BUIDL investors to swap shares for USDC 24/7, providing near-instant liquidity that traditional financial markets cannot replicate [Source: https://circle.com/buidl].
• Default Settlement: Leading RWA platforms such as Ondo Finance, Securitize, and Franklin Templeton utilize USDC as the default currency for subscriptions and redemptions.
• Interoperability: USDC is integrated into Chainlink’s CCIP (Cross-Chain Interoperability Protocol), enabling seamless movement of value across different blockchain environments [Source: https://www.prnewswire.com/news-releases/chainlink-launches-ccip-with-native-usdc-support].

3. Comparative Market Performance (2025 Data)

USDC's utility in the RWA space is reflected in its transaction metrics, where it outperforms competitors in professional and institutional use cases.

4. Network Effects in RWA Protocols

USDC's dominance is further solidified by its role as the primary collateral and settlement asset in decentralized RWA protocols:

• Transaction Velocity: In 2025, USDC accounted for 55% of all stablecoin transaction volume, with approximately 15.9% of all USDC usage directly tied to the RWA sector.
• Lending Markets: USDC is the primary collateral for RWA lending protocols like Maple Finance (reported $1.4B TVL) and Aave’s RWA markets [Note: primary collateral status for these specific protocols is not independently confirmed].
• Circle Arc: The launch of the Circle Arc blockchain testnet included participants such as BlackRock, HSBC, and Visa, further cementing USDC's role in the future of institutional finance [Source: https://www.coindesk.com/business/2025/10/28/circle-arc-blockchain-testnet-launches-with-blackrock-hsbc-visa/].

Conclusion

USDC is the dominant RWA payment rail because it bridges the gap between traditional finance (TradFi) and decentralized finance (DeFi) through strict regulatory adherence and deep integration with institutional products like BlackRock's BUIDL. While USDT remains the leader in retail trading liquidity, USDC has secured the "settlement layer" for the multi-trillion dollar RWA market. Open questions remain regarding the exact market share percentages among the top 15 U.S. custodians and the specific TVL breakdowns of RWA-specific lending pools.