Ethena: Building a New Era of Web3‑Native Digital Dollars

Overview

Ethena is an Ethereum‑based synthetic dollar protocol that delivers crypto‑native monetary solutions, including USDe, a synthetic dollar, and sUSDe, a globally accessible U.S. dollar savings asset.

USDe is a synthetic dollar fully backed by crypto assets and corresponding futures positions, employing a delta-neutral hedging strategy to maintain relative price stability.

sUSDe is the reward‑accruing version of USDe that offers an average 12.5% APY. According to available documentation, USDe supply has reached $6.6 billion and USDtb, available across 24 chains, has a total supply of $874.9 million, with 910,000 users.

Ethena aims to provide a digital dollar for the internet economy, incentivize users to earn protocol revenue through staking, and support both retail and institutional users in creating the future of internet finance.

What Is Ethena

Existing stablecoins face several challenges, including centralized risks tied to traditional financial infrastructure (e.g., custodial risk and censorship risk in centralized stablecoins like USDC or USDT and dependence on the banking system), as well as scalability constraints, fragile mechanism designs, and insufficient liquidity for decentralized stablecoins.

Ethena addresses these problems through its synthetic dollar USDe, offering a crypto‑native, scalable monetary solution. USDe is backed by delta‑hedged Bitcoin, Ethereum, and other approved spot assets, using perpetual and deliverable futures contracts and holding liquid stablecoin reserves such as USDC and USDT. USDe is fully backed (except in extreme risk events) and composable across both CeFi and DeFi. Its peg stability is supported through the use of delta hedging derivatives positions against protocol-held backing assets, maintaining a relatively stable value. Liquid stablecoin reserves enhance hedging efficiency and act as a safeguard in bear markets, potentially earning additional rewards from their deposit venues to bolster protocol revenue.

How Ethena Works

The core technology behind Ethena is the delta‑neutral hedging mechanism, combining on‑chain and off‑chain components to ensure USDe’s peg stability and scalability. The system uses smart contracts for minting, redeeming, staking, and unstaking USDe, with off‑chain services managing hedge positions.

Delta‑Neutral Hedging

USDe maintains relative peg stability through automated, programmatic delta‑neutral hedges that offset the price risk of backing assets held by the protocol. Price‑change risk of the backing assets is minimized through equal, offsetting short positions, such that movements in the value of the backing assets are neutralized on a one‑for‑one basis by the corresponding hedges. Because backing assets can be perfectly hedged with an equal notional short position, USDe only requires a 1:1 collateralization ratio. For example, a user supplies $100 USDT and receives 100 newly minted USDe (net of gas and execution costs). The protocol then opens a corresponding short perpetual position on a derivatives exchange. The backing asset is directly transferred into an Off‑Exchange Settlement solution, remaining on‑chain and custodially managed by an off‑exchange service provider to minimize counterparty risk. Ethena delegates, but does not transfer, custody of backing assets to the derivatives exchange to margin the short perpetual hedging positions.

“Delta” refers to the sensitivity of a derivative contract to changes in the underlying asset price. Ethena’s portfolio achieves delta neutrality by holding equal short positions, thereby eliminating exposure to underlying asset price changes. The dollar value of the combined position remains stable across most market conditions regardless of underlying price movements (e.g., even if ETH rises by 3 times then drops by 90%, gains on spot are offset by losses on short positions). Ethena’s exchange positions carry no effective leverage, as the delta‑neutral short perpetual positions equal the backing assets.

Off‑Exchange Settlement Custody

The backing assets are always held within an Off‑Exchange Settlement institutional‑grade solution. Collateral only flows between custody and exchanges when settling funds or realizing PnL. This structure allows Ethena to delegate/undelegate backing assets to centralized exchanges without exposing assets to risks associated with exchanges. Providers such as Copper, Ceffu, and Fireblocks operate under a bankruptcy‑remote trust framework, ensuring that provider creditors have no claim on these assets. In the event of a provider failure, these assets are expected to remain outside the provider’s estate, avoiding custodial credit risk. Ethena further mitigates risks by diversifying across multiple custodians.

Sources of Protocol Revenue

Ethena generates protocol revenue from three sustainable sources: Funding and basis spreads from delta‑hedged derivative positions; Rewards earned on liquid stable reserves; Consensus and execution‑layer rewards from staking ETH. In 2024, average funding rates were 11% for BTC and 12.6% for ETH, and sUSDe APY averaged 19%. Revenue accrues in native assets or fixed terms depending on derivative types. Rewards on liquid stable reserves vary by deposit venue and may be tied to rates offered by external stakeholders. If funding rates remain deeply negative for sustained periods, the reserve fund absorbs the cost.

Scalability and Censorship Resistance

USDe is backed at a 1:1 ratio thanks to a delta-neutral strategy, where short BTC, ETH, and SOL futures positions offset any changes in value to the underlying backing assets. Other stable assets like USDC can enhance stability and hedging efficiency, providing more resilient backup in downturns. With CeFi liquidity exceeding 30× DeFi open interest, Ethena supports exponential growth. Backing asset bases, including BTC, ETH, and SOL, offer ample open interest for effective hedging. Off‑Exchange Settlement ensures censorship resistance by keeping the banking assets on‑chain and delegated to exchanges without transferring custody. Providers leverage a MPC solution or a bankruptcy‑remote framework to safeguard assets.

Product Advantages and Token Mechanics of Ethena

Ethena offers unmatched transparency, including real‑time information about the allocation of backing assets, weekly proofs of reserves (independent third-party proofs of the value of the backing assets & delta neutrality), and monthly custody attestations (independent attestations of custodied assets). Users can access this data at any time, which helps foster trust.

sUSDe acts as an internet money product, providing global, instant access to USD savings with APY above traditional alternatives. Users stake USDe to receive sUSDe, automatically accruing protocol revenue without additional operation. sUSDe employs a token‑vault model where value increases over time; upon unstaking, users receive their initial stake plus accumulated rewards. A 7‑day cooldown period applies. Value never decreases and, in periods of negative protocol revenue, is supported by the reserve fund.

The Ethena ecosystem also includes USDtb, a synthetic dollar backed by institutional‑grade tokenized U.S. Treasury fund products (e.g., BlackRock’s BUIDL) and stablecoin reserves, supporting fast redemptions. Ethena is evolving into a platform that enables builders to innovate with sUSDe, including Ethereal (perpetual and spot exchange), Strata (perpetual risk‑tranching protocol), Terminal (spot decentralized exchange), Echelon (generalized lending market), and Derive (On‑chain options and structured product protocol). Ethena supports various use cases: earning sUSDe savings in DeFi, using USDe as margins in exchanges, and accessing USDe exposure for institutions via regulated funds.

ENA serves the governance token of the Ethena protocol with multiple utilities:

Governance: ENA holders elect risk committee members biannually and daily decisions are delegated to appointed experts. sENA holders vote directly on ENA tokenomics and ENA‑specific proposals.

sENA Rewards: sENA represents locked ENA with a receipt token composable in DeFi. sENA holders earn rewards from Ethena network participants like Ethereal. The structure of sENA is similar to that of BNB, with ecosystem applications allocating token rewards to sENA holders via partial airdrops.

Re‑staking ENA: Through cooperation with Symbiotic, a universal re‑staking pool enhances economic security for cross‑chain USDe transfers using the LayerZero DVN messaging system.

Conclusion

Ethena is a groundbreaking synthetic dollar protocol designed to address centralized risks, scalability limitations, and yield deficiencies of existing stablecoins, igniting innovation in internet finance! Its vision goes beyond synthetic dollars to reshape accessibility and incentive mechanism of crypto‑native currency. Whether it is enabling sUSDe savings in DeFi or integrating USDe as a bridge for TradFi, Ethena remains committed to the philosophy of “global instant USD savings” and has the potential to usher in a new era of digital dollars for the internet economy.