The EigenLayer Innovation
EigenLayer's fundamental insight: Ethereum's security is rented, not owned. $70B+ in staked ETH secures Ethereum — but that security is exclusive to Ethereum. EigenLayer creates a marketplace where this security can be rented by any protocol willing to pay restakers for accepting additional slashing risk. The result: new protocols can launch with day-one Ethereum-grade security.
Actively Validated Services (AVSes)
AVSes are the services that rent Ethereum security through EigenLayer. They can be: oracle networks, bridge validators, rollup sequencers, data availability layers, keeper networks, or any protocol requiring honest behavior from a decentralized set of actors. AVSes set their own payment rates, slashing conditions, and operator requirements.
EigenDA: The First AVS
EigenLayer's own data availability layer — EigenDA — was the first AVS to launch. It uses EigenLayer operators to provide DA at dramatically lower cost than Ethereum calldata. At launch, EigenDA processed more data than Celestia, Avail, and NearDA combined. Major L2s using EigenDA: Celo, Mantle, and others.
The EIGEN Token
EIGEN serves a unique function: it enables "intersubjective faulting" — slashing for behaviors that are wrong by social consensus but can't be proven cryptographically. For example, an oracle reporting a price everyone agrees is wrong. This extends EigenLayer's security to tasks requiring human judgment, not just mathematical verification.
The LRT Ecosystem
Liquid Restaking Tokens abstracted EigenLayer's complexity. Ether.fi (largest, with $8B+), Renzo, Puffer, and Kelp DAO issued tokens representing restaked ETH positions. These LRTs became DeFi's hottest collateral — Pendle tokenized their yields, Aave accepted them as collateral, and Curve hosted their liquidity pairs.
Risks
The systemic risks are real: cascading slashing across correlated AVSes, LRT smart contract failures, and the challenge of bootstrapping AVS payment rates to attract sufficient restakers. EigenLayer's team has taken a deliberately cautious approach — slashing is initially disabled for most AVSes.