> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rampartlabs.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Balancer V3

> Weighted liquidity pools on Monad via Balancer V3

<Info>
  **Type:** Balancer V3 Weighted Pools | **Docs:** [docs.balancer.fi](https://docs.balancer.fi)
</Info>

## Overview

Balancer V3 introduces a redesigned vault architecture where all pool assets are held in a single central `Vault` contract. Individual pool contracts implement only the swap logic (weighted, stable, composable stable, etc.), while the vault handles custody, accounting, and flash loans.

On Monad, the Rampart reads Balancer weighted pool data - token composition, weights, TVL, and trading fee APY - directly from the central Vault.

## Types

```typescript theme={null}
type BalancerPool = {
  id: string                   // 32-byte pool ID (address + nonce)
  address: `0x${string}`
  tokens: `0x${string}`[]      // pool token addresses
  weights: number[]            // normalized weights, e.g. [0.8, 0.2]
  tvl: number                  // USD TVL
  apy: number                  // trading fee APY (annualized from 7-day volume)
  protocol: 'balancer'
}
```

## Functions

### getBalancerPools()

Returns all Balancer pools registered in the Monad Vault.

```typescript theme={null}
import { Rampart } from 'rampart-monad'

const sdk = new Rampart()
const pools = await sdk.getBalancerPools()
// → BalancerPool[]

pools.forEach(p => {
  const weights = p.weights.map(w => `${(w * 100).toFixed(0)}%`).join('/')
  console.log(`Pool ${p.address}: ${weights}  TVL $${(p.tvl / 1e6).toFixed(1)}M  APY ${(p.apy * 100).toFixed(2)}%`)
})
```

### getBalancerTVL()

Returns the total TVL across all Balancer pools on Monad in USD.

```typescript theme={null}
const tvl = await sdk.getBalancerTVL()
// → number (USD)

console.log(`Balancer TVL: $${(tvl / 1e6).toFixed(1)}M`)
```

## Contract Addresses

| Contract | Address                                      |
| -------- | -------------------------------------------- |
| Vault    | `0xBA12222222228d8Ba445958a75a0704d566BF2C8` |

<Note>
  The Balancer Vault address is the same across all EVM chains where Balancer V3 is deployed. Pool IDs encode both the pool address and a nonce - use `pool.id` (not `pool.address`) when calling vault functions like `getPoolTokens`.
</Note>