# What is Balancer? DeFi Protocol Guide

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**Publisher:** Decentralized Finance Publication (https://decentralized-finance.io)
**Author:** Marcus Reid
**Category:** Top DeFi Protocols
**Updated:** June 2026
**Trust:** Independent, ad-free editorial research. No display advertisements, no paid protocol coverage, no affiliate-driven rankings.

## Summary

Balancer is a programmable AMM that extends the standard two-token liquidity pool to support multi-asset weighted pools, enabling portfolio-like liquidity positions that automatically rebalance — generating trading fees while maintaining target asset allocations.

Balancer is a decentralised automated market maker protocol founded by Fernando Martinelli and Mike McDonald and launched on Ethereum in March 2020. Balancer's core innovation over earlier AMMs was the generalisation of the liquidity pool from a two-asset, 50/50 weighted design to a multi-asset pool with arbitrary weights — allowing up to eight assets in a single pool at custom percentage allocations such as 80/20 ETH/DAI or 33/33/33 across three assets.

The multi-asset, customisable-weight design has a powerful implication: a Balancer pool behaves like a self-rebalancing portfolio. When the price of one asset in the pool rises, traders arbitrage the discrepancy by selling it into the pool, automatically reducing its weight back toward the target allocation. In doing so, they pay trading fees to the liquidity provider — effectively making the liquidity provider's portfolio rebalance for free through fee income rather than at the expense of gas and swap costs.

## Pool Types and Architecture

Balancer V2, launched in 2021, introduced a significant architectural change: the separation of token storage from pool logic. Under V2, all pool assets are held in a single, shared Vault smart contract, while individual pools contain only the pricing and fee logic. This design reduces gas costs (tokens are not moved between contracts unnecessarily) and enables 'internal balances' — allowing users and integrators to maintain token balances within the Vault and execute complex multi-pool trades in a single transaction with dramatically reduced gas.

Balancer supports multiple pool types: Weighted Pools (the original multi-asset pools with custom weights), Stable Pools (using the StableSwap algorithm for pegged assets, similar to Curve), Boosted Pools (which route idle pool liquidity to yield protocols like Aave to generate additional returns for LPs), and Managed Pools (highly configurable pools designed for on-chain fund management with dynamic weights and asset lists).

## BAL Token and veBAL Governance

The BAL governance token was distributed to liquidity providers through a 'liquidity mining' programme beginning in June 2020 — one of the earliest examples of retroactive token distribution to protocol users. BAL holders govern the Balancer protocol through the Balancer DAO, with governance conducted via Snapshot off-chain voting and execution through a multi-signature treasury.

Balancer adopted a vote-escrow model in 2022, introducing veBAL: holders who lock BAL in a specific Balancer 80/20 BAL/ETH pool and then lock the resulting LP tokens receive veBAL, which grants boosted liquidity mining rewards, governance voting rights, and a share of protocol fees. The veBAL model directly mirrors Curve's veCRV mechanism and positions Balancer as a participant in the same liquidity incentive ecosystem — with protocols competing for veBAL votes to direct BAL emissions to their pools, analogous to the Curve Wars.

## Ecosystem Integration

Balancer's architecture has made it a popular foundation for other DeFi protocols building on top of its infrastructure. Aave's GHO stablecoin stability module, Gyroscope's E-CLPs (elliptic concentrated liquidity pools), and numerous liquid staking token pools use Balancer's Vault and pool framework. The protocol has also been a key participant in the liquid staking token ecosystem: the wstETH/WETH pool on Balancer is among the largest on-chain markets for staked ETH.

Balancer has deployed across multiple chains including Arbitrum, Polygon, Optimism, Gnosis Chain, and Avalanche. Its composable, modular architecture and deep integration with Aave's ecosystem have sustained its relevance even as Uniswap V3 and Curve V2 expanded into Balancer's native product territory.

## Sources

- [Balancer.fi](https://balancer.fi)
- [Wikipedia: Balancer (DeFi)](https://en.wikipedia.org/wiki/Balancer_(DeFi))

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