Balancer: Weighted Pools and the DeFi Index Fund

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Balancer extended the AMM concept to support multiple assets with custom weightings. Think of it as a self-rebalancing index fund that also serves as a DEX.

Weighted Pools

Unlike Uniswap’s 50/50 pools, Balancer allows:

  • Up to 8 tokens per pool
  • Custom weights (e.g., 80% ETH / 20% USDC)
  • Automatic rebalancing through arbitrage
  • Reduced impermanent loss for certain configurations

Pool Types

  • Weighted Pools — Custom allocations
  • Stable Pools — Like Curve for stable assets
  • Boosted Pools — Idle liquidity earns yield
  • Linear Pools — Nested pool efficiency

veBAL Governance

Following Curve’s model, Balancer adopted vote-escrow with veBAL tokens.

Key Takeaways

  • Weighted pools enable multi-asset portfolios
  • Custom weights reduce IL for certain strategies
  • Boosted pools maximize capital efficiency
  • veBAL governance influences emission allocation