USDY vs USDC: Ondo Yield-Bearing Dollar and Circle Compared

USDY vs USDC Overview

USDY and USDC both represent dollar-denominated value on-chain, but they serve fundamentally different purposes. USDC is a payment stablecoin issued by Circle that maintains a strict 1:1 peg to the US dollar. USDY is a yield-bearing token issued by Ondo Finance that passes through interest from short-term US Treasuries to holders, causing its price to appreciate over time rather than staying fixed at $1.00.

The distinction matters because it affects regulatory classification, tax treatment, DeFi composability, and who can legally hold each token. The following table summarizes the key differences.

How Yield Works: USDY vs USDC

The core difference between USDY and USDC comes down to who keeps the interest earned on the underlying reserves. Both tokens are backed primarily by short-duration US Treasuries, but they handle the yield from those Treasuries in opposite ways.

Circle holds USDC reserves in a SEC-registered government money market fund managed by BlackRock, targeting roughly 80% Treasuries and 20% cash. The interest earned on those reserves funds Circle's operations and partner revenue-sharing programs. USDC holders receive a stable, redeemable token but no yield. To earn stablecoin yield on USDC, you must deposit it into a third-party lending protocol like Aave or Compound, which introduces smart contract risk.

Ondo passes the Treasury yield directly to USDY holders. The token operates in two modes: standard USDY, where the token price appreciates over time (currently ~$1.14 per token), and rUSDY, a rebasing variant that maintains a $1.00 price while increasing the number of tokens in your wallet. Both represent the same underlying claim. The rUSDY variant rebases daily when the USDY price is updated.

Regulatory Classification

USDY and USDC sit in entirely different regulatory categories, which determines who can hold them, where they can be offered, and how they are treated under US stablecoin legislation.

USDC: Payment Stablecoin

Circle operates under state money transmitter licenses across the US and holds an e-money license under MiCA in the European Union. USDC is classified as a payment instrument, not a security. Circle publishes monthly reserve attestations examined by Deloitte under AICPA AT-C 205 standards, with over 41 consecutive monthly reports as of early 2026. Under the GENIUS Act framework, USDC qualifies as a permitted payment stablecoin because it does not pay yield to holders.

USDY: Securities Exemption

USDY is structured as a bearer note offered under Regulation S of the US Securities Act of 1933. This exemption restricts primary issuance to non-US persons. Ondo USDY LLC is registered with FinCEN and imposes a 40-50 day lockup on newly minted tokens before they become transferable on-chain. Once the lockup expires, secondary transfers are permissionless. US persons cannot mint or redeem USDY directly, though Ondo's separate product OUSG targets US accredited investors with higher minimums and direct exposure to BlackRock's BUIDL fund.

This regulatory split has practical consequences. The debate around stablecoin yield prohibition in the US means that yield-bearing tokens like USDY fall outside the definition of "permitted payment stablecoins" under current legislative proposals. USDC, by not passing yield to holders, avoids this classification issue entirely.

Liquidity and Market Depth

USDC's ~$72 billion market cap makes it the second-largest stablecoin after USDT. It is the default settlement token on most DeFi protocols, supported natively on over 35 chains through Circle's Cross-Chain Transfer Protocol (CCTP), which burns USDC on the source chain and mints it natively on the destination. There is no minimum for on-chain transfers, and redemption to USD is available through Circle's API or through partner exchanges with no lockup.

USDY's ~$2.1 billion market cap is roughly 3% the size of USDC's. On-chain supply is distributed across Ethereum, Solana, Mantle, Sui, Aptos, and BNB Chain, with cross-chain movement enabled by the Ondo Bridge built on LayerZero. Direct minting requires a $500 minimum (or $5,000 on certain chains), KYC verification, and a 40-50 day lockup before tokens become transferable. Redemption is processed via bank wire to non-US accounts only.

For use cases requiring instant liquidity, fast settlement, or cross-chain transfers, USDC is the clear choice. For held balances where the opportunity cost of foregone interest outweighs the need for instant access, USDY captures value that USDC leaves on the table. See our stablecoin comparison tool for broader liquidity data across all major stablecoins.

Chain Availability

USDC's chain coverage is significantly broader, covering 35+ networks with native issuance. USDY is concentrated on six chains where Ondo has deployed its smart contracts and bridge infrastructure. For applications on Arbitrum, Base, Optimism, or Polygon, USDC is the only option between these two.

DeFi Composability

USDC is the most widely integrated stablecoin in DeFi. It serves as the base pair on most DEXs, the primary lending asset on Aave and Compound, and the default settlement token across perpetual futures platforms. Virtually every DeFi protocol on every major chain supports USDC natively.

USDY's DeFi integrations are narrower but growing. On Solana, USDY is accepted as collateral on Drift for perpetual futures trading and integrated into Kamino Finance for yield strategies. On Ethereum and Mantle, USDY can be used in lending protocols and liquidity pools that support rebasing or appreciating tokens. The rUSDY variant helps with protocol compatibility since many DeFi protocols expect tokens to maintain a stable $1.00 price.

The key constraint on USDY composability is composability with transfer restrictions. Newly minted USDY cannot be transferred for 40-50 days, and some protocols may need to account for the appreciating price mechanism. Protocols built for standard ERC-20 stablecoins may require integration work to correctly handle USDY's price appreciation or rUSDY's rebasing behavior.

Reserve Transparency and Risk

Both USDY and USDC are backed by high-quality, short-duration assets, but their transparency mechanisms differ.

Circle publishes monthly attestation reports examined by Deloitte, confirming that USDC reserves meet or exceed circulating supply. The reserves are held in the Circle Reserve Fund, a SEC-registered government money market fund with a weighted-average maturity under 60 days. This structure provides regulatory clarity and institutional-grade transparency.

Ondo provides daily proof of reserves for USDY, with third-party oversight of the underlying Treasury portfolio. The assets backing USDY are held by Ondo USDY LLC, a bankruptcy-remote entity. However, because USDY is classified as a securities offering (Reg S), it operates under a different regulatory framework than payment stablecoins. This means less direct oversight from banking regulators but SEC-aligned disclosure requirements.

For a broader comparison of reserve practices across the stablecoin market, see stablecoin reserve transparency and audit practices.

When to Use USDY vs USDC

The choice between USDY and USDC depends on whether you prioritize yield or liquidity, and whether you are a US person.

• Use USDC for payments, trading, cross-chain transfers, and any use case requiring instant liquidity or broad protocol support
• Use USDC if you are a US person, since USDY is not available to US individuals under Reg S
• Use USDY for treasury holdings, idle balances, or any scenario where you want passive yield on dollar-denominated assets without active DeFi management
• Use USDY as collateral on supported protocols (Drift, Kamino) where you can earn yield while maintaining exposure
• Consider rUSDY when integrating with DeFi protocols that expect a stable $1.00 token price

Many institutional treasuries use both: USDC for operational liquidity and USDY for reserves that would otherwise sit idle. For other real-world asset tokenization products compared side-by-side, see the yield-bearing stablecoin comparison and our research on tokenized treasuries and on-chain yield.

For stablecoin use cases on Bitcoin, Spark supports USDB as a payment stablecoin native to Bitcoin's layer-2 ecosystem, offering fast settlement without bridging to EVM chains.

Frequently Asked Questions

Does USDY pay interest automatically?

Yes. Standard USDY accrues yield through price appreciation: the token's value increases over time as interest from the underlying Treasury portfolio is reflected in the price. No staking, lending, or DeFi interaction is required. The rUSDY rebasing variant achieves the same result by increasing your token count while maintaining a $1.00 price per token. Both modes are automatic and require no action from the holder.

Can US residents buy USDY?

No. USDY is offered under a Regulation S exemption, which restricts primary issuance to non-US persons. US residents and entities cannot mint or redeem USDY. Ondo offers a separate product called OUSG for US accredited investors, which provides similar Treasury yield exposure but requires higher minimums and operates under Regulation D.

What is the difference between USDY and rUSDY?

USDY and rUSDY represent the same underlying asset but express yield differently. USDY uses a price-appreciation model where the token trades above $1.00 (currently ~$1.14). rUSDY uses a rebasing model where the token stays at $1.00 and your wallet balance increases. rUSDY is better suited for DeFi integrations that expect a stable unit price, while USDY is simpler for holding and tracking total return.

Is USDY safer than USDC?

Both are backed by short-duration US Treasuries and maintain high reserve quality. USDC has a longer track record, broader regulatory coverage (state MTLs, MiCA), monthly Deloitte attestations, and significantly more liquidity at ~$72B market cap versus USDY's ~$2.1B. USDY offers daily proof of reserves and is held in a bankruptcy-remote SPV, but operates under a securities exemption rather than payment stablecoin regulation. Neither is FDIC-insured.

Why does USDC not pay yield?

Circle earns interest on the Treasury bills and cash deposits backing USDC but retains that yield to fund operations and partner revenue-sharing programs. This structure is deliberate: passing yield to holders would likely reclassify USDC as a security under US law, which would restrict who can hold it and where it can be traded. By not paying yield, USDC maintains its status as a permitted payment stablecoin under emerging US legislation.

Can I use USDY as collateral in DeFi?

Yes, on supported platforms. USDY is accepted as collateral on Drift (Solana) for perpetual futures and integrated into Kamino Finance for yield strategies. Protocol support is expanding but remains limited compared to USDC, which is accepted as collateral on virtually every major lending and derivatives protocol across all chains.

How long does it take to redeem USDY for USD?

Newly minted USDY has a 40-50 day lockup period before tokens become transferable on-chain. Once tokens are unlocked, redemption is processed via bank wire to non-US bank accounts only, with standard settlement times. By contrast, USDC can be redeemed instantly through Circle's API or via partner exchanges with no lockup or geographic restriction on bank accounts.

This tool is for informational purposes only and does not constitute financial advice. Data is approximate and based on publicly available information as of August 2026. Yield rates fluctuate with US Treasury rates. Always verify current rates and eligibility requirements before making decisions.