Balancer is a programmable liquidity protocol on Ethereum that introduced weighted pools — AMMs that can hold more than two assets at custom percentage allocations. Balancer v3, launched in 2024, overhauled the architecture for gas efficiency and deeper yield integration.
What Makes Balancer Different
Standard AMMs (Uniswap, Curve) use fixed 50/50 or equal-weight pools. Balancer pools can hold 2–8 assets at any weight distribution. A pool could hold 60% ETH, 20% WBTC, and 20% USDC — acting like an index fund that automatically rebalances through trading.
Pool types:
Weighted pools: Custom allocation pools (e.g., 80/20 BAL/ETH). The asset with higher weight experiences less impermanent loss when its price rises. Used for protocol-owned liquidity and treasury diversification.
Stable pools: Curve-style StableSwap math for same-value assets. Used for stablecoin pairs and LST/ETH pairs.
Boosted pools (v3): Pool assets are deployed to external yield protocols (Aave, Morpho) when not being used for swaps. LPs earn swap fees plus passive lending yield on idle capital simultaneously.
Balancer v3: Key Changes
100% boosted by default: In v3, all idle pool liquidity can be deployed to yield vaults automatically. LPs in a USDC/ETH pool don't just earn swap fees — their idle USDC earns Aave yield between swaps.
Hooks (like Uniswap v4): Balancer v3 introduced hooks for custom pool logic — dynamic fees, rebalancing mechanisms, MEV redistribution.
Gas optimization: The v3 architecture uses a transient storage pattern, reducing multi-hop swap gas costs significantly.
veBAL Governance
BAL is Balancer's governance token. Lock BAL in the 80/20 BAL/ETH pool, then lock LP tokens for up to 1 year to receive veBAL.
veBAL gives:
- Gauge voting power: direct BAL emissions to pools
- Protocol fee revenue share: 75% of collected fees distributed to veBAL holders
- Boosted LP rewards: up to 2.5x on emissions for voted pools
The gauge/bribe system mirrors Curve's model. Aura Finance (Balancer's equivalent of Convex) aggregates veBAL voting power.
How to Use Balancer
- Go to balancer.fi and connect your Ethereum wallet
- Navigate to Pools and filter by chain, pool type, or asset
- Select a pool and click Add Liquidity — Balancer accepts single-asset deposits (it rebalances internally)
- Stake LP tokens in the gauge to earn BAL emissions
For best yields, use Aura Finance to deposit Balancer LP tokens — Aura's pooled veBAL provides boosted rewards without requiring you to lock BAL yourself.