What is Cap Protocol? cUSD, stcUSD and Restaking-Backed Stablecoin Yield Explained (2026)

Cap Protocol is a DeFi protocol focused on stablecoin issuance and yield generation, issuing two primary products: cUSD, a dollar-pegged stablecoin, and stcUSD, the yield-bearing form of cUSD that accrues returns from restaking integrations and institutional yield strategies. With approximately $345 million in TVL as of May 2026, Cap occupies a distinctive niche at the intersection of stablecoin infrastructure and DeFi yield optimisation.

Cap's model differs from traditional overcollateralised CDP stablecoins (like MakerDAO's DAI) and algorithmic stablecoins. Instead, cUSD is backed by a combination of restaking positions (through EigenLayer and similar protocols), tokenised real-world assets, and institutional lending strategies — creating a multi-source yield backing that the protocol distributes to stcUSD holders.

How Cap Protocol Works

Users deposit supported collateral assets into Cap Protocol to mint cUSD at a specific collateral ratio. The deposited collateral is deployed into yield-generating strategies — primarily restaking through protocols like EigenLayer, where ETH collateral earns Actively Validated Service (AVS) rewards — while the minted cUSD represents a claim on that collateral.

stcUSD is the savings form of cUSD. Users who convert cUSD to stcUSD participate in the protocol's yield pool. The stcUSD/cUSD exchange rate appreciates over time as yield accrues from the underlying restaking and institutional strategies. This mechanism is similar to sDAI (Savings DAI) but with a yield source that draws from restaking rather than a central bank rate or on-chain lending fees.

The collateral backing cUSD continues to work in the underlying restaking system — earning points, restaking rewards, and AVS fees — while the user holds liquid cUSD or stcUSD. This stacked capital efficiency model is central to Cap's value proposition.

Cap's Restaking Integration

Cap Protocol's restaking integration connects it to the broader liquid restaking ecosystem. By routing collateral through restaking protocols, Cap can generate yield on ETH-denominated collateral that would otherwise sit idle in a traditional overcollateralised CDP vault. This yield is then distributed to stcUSD holders as the protocol's savings rate.

The restaking backing also means Cap's yield is partially correlated with the restaking ecosystem's health — if AVS rewards decline or restaking slashing events occur, Cap's backing could be affected. This is a key risk factor that differentiates Cap from stablecoins backed solely by US Treasuries or on-chain lending fees.

Cap as a Lending Protocol Competitor

Cap is classified alongside DeFi lending protocols in TVL rankings because its model involves collateral deployment and stablecoin minting — mechanically similar to CDP lending. However, Cap is more accurately a yield-bearing stablecoin protocol that competes with protocols like Ethena (USDe), Frax Finance (FRAX/frxUSD), and MakerDAO (DAI/USDS) for yield-seeking stablecoin users, as well as competing with pure lending protocols for total DeFi TVL.

For users who want to hold a dollar-denominated asset that generates yield without actively managing a lending position, stcUSD provides a simple single-asset experience. This is its primary competitive advantage over protocols like Aave or Compound, which require active position management.

Resupply Finance: Yield Stacking on Lending Positions

Cap Protocol's stcUSD generates yield from restaking strategies. Resupply Finance, co-built by Convex Finance and Yearn Finance, takes a different but related approach: users deposit yield-bearing Curve Lend positions (crvUSD) or Frax Finance positions (frxUSD) as collateral to mint reUSD, while the underlying collateral earns Convex-boosted CRV yield throughout the loan. Both protocols represent the idea that collateral should never sit idle — yield should be generated at every layer of the capital stack. RSUP governance tokens provide additional rewards to Resupply participants.

This section is for informational purposes only. Nothing in this article constitutes financial or investment advice. Stablecoin and yield protocols carry significant risks including smart contract vulnerabilities, oracle failures, restaking slashing events, and collateral depegging. Always conduct thorough due diligence. Invest only what you can afford to lose.

Frequently Asked Questions: Cap Protocol

• What is Cap Protocol? Cap Protocol is a DeFi protocol that issues cUSD (a dollar-pegged stablecoin) and stcUSD (a yield-bearing form of cUSD). Yield is generated from restaking integrations and institutional strategies. As of May 2026, Cap holds approximately $345 million in TVL.
• What is cUSD? cUSD is Cap Protocol's dollar-pegged stablecoin. It is minted by users who deposit approved collateral (primarily ETH-based assets) at a defined collateral ratio. cUSD can be used across DeFi or converted to stcUSD to earn yield.
• What is stcUSD? stcUSD is the yield-bearing form of cUSD. Its exchange rate against cUSD appreciates over time as yield accrues from Cap's underlying restaking and institutional strategies. Holding stcUSD is similar to holding sDAI (Savings DAI) — the position grows in cUSD terms without requiring active management.
• How does Cap Protocol generate yield? Cap generates yield by deploying collateral into restaking protocols (such as EigenLayer), where ETH-based collateral earns Actively Validated Service (AVS) rewards. Additional yield may come from institutional lending strategies. This yield is distributed to stcUSD holders.
• What is restaking and how does it relate to Cap? Restaking allows already-staked ETH (or liquid staking tokens) to be used to provide cryptoeconomic security to additional services (Actively Validated Services, or AVSs) beyond Ethereum consensus. Cap routes its ETH collateral through restaking, earning AVS rewards that fund stcUSD yield.
• Is Cap Protocol the same as a CDP protocol like MakerDAO? Cap has similarities to CDP protocols — collateral is deposited and stablecoins are minted. But Cap's yield model (restaking) and its savings token (stcUSD) make it more akin to a yield-bearing stablecoin protocol than a purely collateral-backed CDP. It competes with Ethena, Frax, and MakerDAO as much as with Aave.
• What are the risks of Cap Protocol? Key risks include: smart contract exploits, restaking slashing events (if an AVS is penalised), collateral depegging, oracle manipulation, and yield volatility if restaking rewards decline. Restaking adds a layer of risk not present in simpler overcollateralised protocols.
• How does Cap compare to Ethena (USDe)? Both use non-traditional yield strategies to back their stablecoins. Ethena uses delta-neutral ETH hedging (perpetual shorts). Cap uses restaking and institutional strategies. Both are yield-bearing stablecoin protocols that compete for users seeking passive dollar yield. Risk profiles differ: Ethena's main risk is funding rate flips; Cap's main risk is restaking slashing.
• What collateral does Cap Protocol accept? Cap accepts ETH, liquid staking tokens (such as stETH, rETH), and other approved assets. The accepted collateral set is governed by the Cap Protocol.
• What chains is Cap Protocol on? Cap Protocol is deployed on Ethereum mainnet.
• What is Cap Protocol's TVL? Cap Protocol holds approximately $345 million in total value locked as of May 2026.
• Is Cap Protocol the same as the Cap trading protocol? No. Cap Protocol (the stablecoin/lending protocol) is unrelated to Cap (a decentralised perpetuals exchange that previously operated). They share a name but are separate protocols.
• How do I use Cap Protocol? Visit Cap Protocol's official interface, connect a Web3 wallet, deposit approved collateral to mint cUSD, and optionally convert cUSD to stcUSD to earn restaking-backed yield.