Ethena

Ethena is a synthetic dollar protocol launched on Ethereum in 2024 that issues USDe — a synthetic dollar backed by crypto collateral paired with short perpetual positions on centralised derivative exchanges. The protocol does not rely on fiat reserves or traditional banking infrastructure; instead, USDe maintains its dollar peg through a delta-neutral strategy in which the long price exposure of deposited crypto collateral is offset by an equivalent notional short perpetual position, resulting in a backing portfolio with near-zero net market exposure. The Ethena application is accessible at app.ethena.fi, and USDe is an ERC-20 token deployed on Ethereum mainnet

The ENA token is the governance token of the Ethena protocol, used by holders to vote on risk parameters, approved collateral assets, custodian selection, and protocol upgrade proposals through the Ethena governance process. Ethena also issues sUSDe — a staked form of USDe — that captures yield accrued from the protocol's collateral staking rewards and the funding rate income generated by the short perpetual hedge positions, distributing this yield to sUSDe holders over time. Protocol documentation is maintained at docs.ethena.fi, and smart contract source code is publicly available on GitHub under the ethena-labs organisation with audit reports referenced in the security documentation

The primary interface for Ethena users is app.ethena.fi, where holders of supported crypto collateral assets can mint USDe by depositing ETH, staked ETH variants, or BTC into the Ethena protocol. When a user deposits collateral, the protocol simultaneously opens a short perpetual position of equivalent notional value on a supported centralised derivative exchange, creating a delta-neutral position in which the collateral's long price exposure is cancelled by the short hedge. The resulting USDe issued to the depositor represents a claim on the delta-neutral backing portfolio, redeemable at the prevailing redemption rate for the underlying collateral value subject to the applicable withdrawal queue

USDe holders can stake their tokens through the app.ethena.fi interface to receive sUSDe, which accrues yield generated by the protocol's backing portfolio. sUSDe yield comes from two primary sources: staking rewards generated by the Ethereum-based collateral assets — such as staking yield from staked ETH positions — and funding rate income generated by the short perpetual positions used to delta-hedge the collateral exposure. The sUSDe exchange rate relative to USDe increases as yield is accrued, meaning sUSDe holders receive a growing USDe-denominated value per sUSDe token without requiring active yield claims

The delta-neutral design of USDe is the core architectural mechanism that distinguishes Ethena from both fiat-collateralised and overcollateralised stablecoins. When a user deposits ETH or another supported collateral asset, the protocol establishes a notional-equivalent short perpetual futures position on a supporting centralised exchange, neutralising the long delta of the deposited collateral. A rise or fall in the price of the collateral asset is offset by a corresponding gain or loss on the short perpetual hedge — keeping the net USD value of the backing portfolio approximately constant and supporting USDe's dollar peg without requiring fiat reserves or significant overcollateralisation. The collateral assets are held with qualified custodians that support off-exchange settlement, allowing backing assets to remain under protocol custody while perpetual hedge positions run on centralised exchange infrastructure

sUSDe functions as the yield-bearing token of the Ethena protocol, capturing the protocol's aggregate income from two streams: staking yield from the crypto collateral assets held in the backing portfolio, and funding rate payments received from the short perpetual positions used to delta-hedge that collateral. Funding rates in perpetual futures markets represent a periodic payment exchanged between long and short position holders to keep the perpetual price anchored to the spot price — when markets are in a positive funding environment, short positions receive funding payments from longs, which are directed to the sUSDe yield pool. The sUSDe token uses a share-based accounting model in which sUSDe holders own a proportional share of a growing pool of USDe, with the pool increasing as the protocol's collateral staking and funding income is distributed

Multi-asset collateral support allows Ethena to accept ETH, liquid staking token variants of ETH such as stETH, and BTC as collateral for USDe minting. Each supported collateral type has a corresponding delta hedge applied through short perpetual positions on the relevant asset — ETH collateral is hedged with ETH perpetual shorts, and BTC collateral is hedged with BTC perpetual shorts — ensuring that the delta-neutral property is maintained at the individual asset level rather than only in aggregate across the portfolio. Diversification across collateral types distributes the backing portfolio's exposure across multiple assets and their associated derivative liquidity pools, rather than concentrating all exposure in a single collateral asset

ENA governance allows token holders to participate in directing the Ethena protocol through voting on risk parameters including approved collateral asset additions, custodian approval decisions, risk limits for individual exchange counterparty exposure, and protocol upgrade proposals. ENA holders interact with the governance process through the Ethena governance forum and on-chain voting mechanisms, with approved governance outcomes implemented by the protocol's risk committee and engineering team. The governance model and its parameters are described in the Ethena documentation at docs.ethena.fi and reflect the protocol's approach to managing the custodian, exchange counterparty, and collateral risks inherent in a delta-neutral synthetic dollar architecture

Ethena supports several DeFi use cases across its synthetic dollar ecosystem: USDe holders use the protocol to maintain a dollar-denominated position backed by delta-neutral crypto positions rather than fiat reserves; sUSDe stakers deposit USDe to earn yield generated by collateral staking income and perpetual funding rate receipts without actively managing positions; DeFi protocols integrate USDe or sUSDe as a yield-bearing dollar asset within liquidity pools, lending markets, and treasury management strategies; ENA holders participate in governance to vote on protocol risk parameters, collateral additions, and upgrade proposals through the process documented at docs.ethena.fi; and developers building DeFi integrations reference the open-source contracts at github.com/ethena-labs to query protocol state, read sUSDe exchange rates, and interact with the USDe minting and redemption interfaces

Developer integration with Ethena is supported through the protocol documentation at docs.ethena.fi and the open-source smart contract repositories available on GitHub under the ethena-labs organisation at github.com/ethena-labs. The core Ethena protocol repository at github.com/ethena-labs/ethena-protocol provides contract source code and ABI definitions for the USDe minting, redemption, and sUSDe staking contracts deployed on Ethereum mainnet, allowing developers to inspect the on-chain architecture, query contract state, and integrate USDe or sUSDe into other protocols. Developers building on the Ethena protocol should reference the documentation for mint and redeem interface details, approved collateral asset lists, and the sUSDe share accounting model used to calculate yield accrual for sUSDe holders

Ethena maintains security documentation and audit references at docs.ethena.fi/solution-overview/security, covering the protocol's security model, the custodial architecture for collateral management, and the published audit history for core Ethena smart contracts. Smart contract source code for the Ethena protocol is publicly available on GitHub under the ethena-labs organisation at github.com/ethena-labs/ethena-protocol for independent review. The Ethena architecture introduces specific risks beyond standard DeFi protocols — these include funding rate risk, where negative funding periods reduce or eliminate sUSDe yield; exchange counterparty risk, where centralised exchange failures affect hedge position management; and custodian risk, where third-party custodians hold collateral assets under off-exchange settlement arrangements. Users and developers evaluating Ethena should review the security documentation, the audit reports, and the risk management documentation at docs.ethena.fi before minting USDe or deploying sUSDe within on-chain protocols

Ethena provides a delta-neutral synthetic dollar protocol on Ethereum that issues USDe — backed by crypto collateral offset with short perpetual hedges rather than fiat reserves — and sUSDe, a yield-bearing token that captures protocol income from collateral staking rewards and perpetual funding payments. Published audit documentation at docs.ethena.fi/solution-overview/security, open-source contracts at github.com/ethena-labs/ethena-protocol, and ENA governance through the process documented at docs.ethena.fi give developers and users structured resources for evaluating the protocol's collateral architecture and risk model. Teams and users evaluating Ethena should review the documentation at docs.ethena.fi, the security documentation, and the audit reports to understand the delta-neutral backing mechanism, funding rate risk, custodian trust assumptions, and sUSDe yield distribution model before minting USDe or staking into the sUSDe yield pool