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Crypto yield aggregators bundle multiple onchain yield sources into a single vault, auto-compound rewards, and route deposits across strategies. The 2026 leaders by TVL and operating history are Beefy Finance, Yearn V3, Sommelier, Yelay, Idle Finance, and Enzyme. Each takes a fee and adds smart-contract risk on top of the underlying protocols it deposits into. APYs and TVL figures cite DeFiLlama yield aggregator rankings on May 24, 2026.
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Top six yield aggregators ranked by TVL and operating history:

A direct deposit into Aave V3 USDC earns Aave's supply APY and nothing more. A yield aggregator vault that targets USDC takes that same deposit, then routes it across Aave, Morpho, Spark, Fluid, or a Curve liquidity pool, harvests reward tokens, sells them for the deposit asset, and redeposits the proceeds. The user holds one vault token; the underlying composition shifts as the aggregator rebalances.
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Three categories of aggregator dominate in 2026. Auto-compounders like Beefy and Yelay focus on the harvest-and-redeposit loop and rebalance infrequently. Allocator vaults like Yearn V3 and Sommelier actively rotate between underlying protocols based on rate signals. Tranched vaults like Idle's Senior and Junior tranches split a single underlying strategy into risk-segmented claims. Enzyme sits in a fourth category as a customizable vault framework where vault managers (not the protocol) define the strategy.
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The matrix below summarizes the six aggregators on the dimensions that matter for a USDC or stablecoin depositor. Performance fees apply on harvested rewards (not on principal), so the headline APY is reported net of fees on every aggregator dashboard.
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TVL gaps between the top three and the rest reflect operating history, not necessarily strategy quality. Beefy launched in 2020, Yearn in 2020 (V3 in 2024), Sommelier in 2022. Yelay and the newer Enzyme vaults launched in the past two years and are still building TVL track records.
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Beefy Finance is the largest yield aggregator by TVL ($420M in May 2026) and the broadest by chain coverage (20+ networks). Its vaults focus on auto-compounding: deposit a token or LP position, Beefy harvests the underlying reward emissions on a schedule, sells them for the deposit asset, and redeposits. The user sees one mooToken (Beefy's vault receipt) appreciate in price as compounding accrues.
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Beefy's 4.5% performance fee splits across three parties. The strategist who wrote the vault earns 3%, the Beefy treasury earns 1%, and 0.5% rewards the address that calls the harvest transaction (a public good incentive). Audits cover individual vaults rather than a monolithic protocol because each strategy is its own contract. Halborn, Certik, and PeckShield have reviewed multiple vaults. Live vault list and current APYs publish on the Beefy dApp. Beefy's strength is breadth: if a niche LP position needs compounding, Beefy probably has a vault. The trade-off is that each vault inherits the risk of its underlying strategy, so depositors must read what's under the hood, not just the headline APY.
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Yearn V3 launched in 2024 and rebuilt the original Yearn architecture around modular allocator vaults. The base vault holds the deposit asset; a curator role decides which underlying strategies receive capital and in what proportion. Curators include Yearn DAO itself, Gauntlet, and Re7 Labs. Yearn V3 holds $310M TVL across Ethereum, Polygon, Arbitrum, Optimism, and Base.
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Performance fees are set per vault (0-20%), giving curators flexibility to compete on cost. Audits include ChainSecurity, Trail of Bits, and Spearbit. The V3 architecture inherits the original Yearn V2 strategist culture but adds permissionless vault deployment, which means anyone can spin up a curated allocator. The depositor's job is to read the curator's mandate, not just the APY. For a stablecoin depositor, the Yearn USDC vault on Ethereum currently allocates across Aave V3, Morpho Blue, and Compound V3 based on a rate-comparison signal.
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Sommelier (the protocol formerly architected on Cosmos with EVM-side cellars) lets strategists actively rebalance vault holdings based on offchain analysis. The strategist's signal is verified through a Cosmos-side coordination chain before execution on Ethereum or an L2. TVL sits at $185M in May 2026, split across cellars on Ethereum, Arbitrum, Optimism, and Base.
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Fees are typically 2% management plus 10% performance, with exact terms set per cellar. Audits cover both the Cosmos coordination layer (OtterSec) and the EVM-side execution contracts (Halborn, PeckShield). Sommelier is the closest thing to a hedge-fund vehicle onchain: the strategist makes discretionary calls (rotating between Aave, Morpho, Pendle PT positions, or LP roles in Uniswap V4), and the depositor accepts that the strategy can change without notice. Higher upside, more reliance on strategist judgment, and a non-trivial onboarding curve since each cellar has a different mandate.
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Yelay focuses narrowly on stablecoin routing. Deposits move across Aave, Morpho, Spark, Fluid, and Pendle PT-USDC based on best available rate, with a 10% performance fee. TVL is $95M in May 2026, and the protocol's audits come from Hats Finance and Ackee Blockchain. Yelay's pitch is simplicity: if you want a USDC vault that always sits in the highest-yielding stable lending market, Yelay routes for you.
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Idle Finance pioneered tranched vaults onchain. A single underlying strategy (for example, Aave V3 USDC supply) is wrapped into a Senior tranche (lower yield, first-loss-protected) and a Junior tranche (higher yield, absorbs first losses). Senior depositors trade yield for a buffer; Junior depositors take the leveraged premium. TVL is $78M across Ethereum, Polygon zkEVM, and Optimism. Idle's audits cover Consensys Diligence, Quantstamp, and MixBytes. The model works well during steady markets and stresses during sharp drawdowns when the Junior tranche absorbs the hit.
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Enzyme is the customization-first option. It is less a single-product yield aggregator and more a framework where vault managers (DAOs, funds, individuals) deploy their own strategies onchain. TVL across all Enzyme vaults is $190M. Fees are set per vault. For a depositor, Enzyme requires the most due diligence because the vault manager (not Enzyme itself) defines the mandate. Audits cover the core protocol (ChainSecurity, OpenZeppelin), but each vault's strategy logic is the manager's responsibility.
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Every aggregator stacks risk on top of the protocols it deposits into. A Beefy vault that earns yield on a Curve LP that uses Aave's USDC as one leg inherits Aave's smart-contract risk plus Curve's plus Beefy's strategy contract. Three audited layers is still three layers. The 2022 attack on Yearn's iearn vault (a legacy product) and the 2024 incident with a smaller aggregator illustrate that strategy contracts have been hit historically, even when the underlying protocols held up.
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This compounding risk is the core trade-off of using an aggregator over direct deposit. The depositor gains auto-compounding, multi-protocol routing, and (often) higher headline APY at the cost of one or two additional contract surfaces. Diversification across aggregators (not putting all yield deposits into one) is the cheap hedge. The other practical hedge: read the strategy contract for any vault holding meaningful capital. See the companion article on the risks of yield-bearing stablecoins for a parallel analysis on wrapped-stable tokens.
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Aggregator fees show up in two places: performance fees on harvested rewards (the standard) and, occasionally, management fees on assets under management (Sommelier, Enzyme). Performance fees are taken from the yield delta between harvests, not from principal. A 10% performance fee on a 5% gross APY produces a 4.5% net APY. The displayed APY on most dashboards is already net of fees, but verify on each protocol.
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Gas costs of harvest transactions also matter for small deposits. Beefy's 0.5% caller incentive means that public harvesters get paid to call harvest functions, which keeps small deposits compounding even when individual gas costs would otherwise eat the yield. On L2s (Base, Arbitrum, Optimism), this matters less because gas is cheap. On Ethereum mainnet, it can be the difference between a profitable position and a break-even one for deposits under $5,000. See the stablecoin yield farming guide for fee math on LP-based strategies that aggregators commonly wrap.
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Eco Routes settles USDC and other stablecoins across 15+ supported chains so that a depositor on one chain can move capital into an aggregator vault on another chain without holding the destination chain's gas token. For a depositor on Base who wants Beefy Polygon, Sommelier Arbitrum, or Yearn V3 Optimism exposure, Eco intents handle the cross-chain leg and abstract gas. Eco is one option among several; LI.FI, Across, and Circle's native CCTP also bridge USDC across chains. The yield rates from any aggregator are protocol-level rates and do not depend on the bridge.
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A yield aggregator is a smart contract vault that takes a deposit, routes it across one or more underlying yield protocols (Aave, Morpho, Curve, Pendle), harvests reward emissions, and redeposits the proceeds to compound. The depositor holds one vault token whose value tracks the underlying strategy's net asset value.
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Yield aggregators add smart-contract risk on top of the protocols they deposit into. Even when the underlying lending or LP protocol holds up, the aggregator's strategy contract can fail (historical examples include the 2022 Yearn iearn incident). Diversifying across aggregators and reading per-vault audits before depositing is standard practice.
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Headline APY varies week to week. Sommelier cellars and Yearn V3 curator vaults often top the table on rate during active rebalancing periods. Beefy is usually a few hundred bps below on equivalent strategies because its auto-compounding is passive rather than actively rebalanced. Always compare net-of-fee APY on DeFiLlama, not the protocol's own dashboard.
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Performance fees apply to the yield delta between harvests, not to principal. Beefy charges a flat 4.5% performance fee. Yearn V3 ranges 0-20% set per vault by the curator. Sommelier adds a 2% management fee on assets under management plus 10% performance. The displayed APY on the protocol's dashboard is usually net of fees.
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Yes, and diversifying across aggregators is the standard hedge against any single aggregator's contract risk. A common allocation splits stablecoin yield deposits across Beefy (broadest chain coverage), Yearn V3 (Ethereum and L2 curator vaults), and direct deposits into Aave or Morpho (no aggregator layer). See the USDC yield platform comparison for the direct-deposit alternatives.
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Sources and methodology. Aggregator TVL pulled from DeFiLlama yield aggregator category on May 24, 2026. Per-vault APYs from DeFiLlama yields, 30-day window. Fee structures verified against each protocol's official documentation: Beefy docs, Yearn docs, Sommelier docs, Idle docs, Enzyme docs. Audits cross-checked against each protocol's GitHub audit registry. Figures refresh quarterly; APYs and TVL are variable.
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