Bean

Type: DLMM DEX | Docs: bean.exchange

Overview

Bean is a Discrete Liquidity Market Maker (DLMM) DEX native to Monad. Like LFJ’s Liquidity Book, Bean organizes liquidity into discrete price bins. Trades within a bin execute at zero slippage. Bean is optimized for Monad’s high-throughput environment, taking advantage of sub-second block times for responsive price discovery.

Functions

getBeanPairs()

Returns all active Bean trading pairs on Monad. Returns

Field	Type	Description
`pairAddress`	`Address`	Bean pair contract address
`token0`	`Address`	First token address
`token1`	`Address`	Second token address
`binStep`	`number`	Bin size in bps
`activeId`	`number`	Current active bin ID
`reserve0`	`bigint`	Reserve of token0
`reserve1`	`bigint`	Reserve of token1
`price`	`number`	Current price of token0 in token1
`fee`	`number`	Base fee in bps

import { getBeanPairs } from 'rampart-monad'

const pairs = await getBeanPairs()
console.log(`${pairs.length} Bean pairs`)

for (const pair of pairs) {
  console.log(`${pair.token0}/${pair.token1}`)
  console.log(`  Price: ${pair.price} | Bin step: ${pair.binStep} bps`)
  console.log(`  Active bin: ${pair.activeId}`)
}

getBeanPairCount()

Returns the total number of Bean pairs deployed on Monad. Returns number. total count of Bean pairs registered in the factory.

import { getBeanPairCount } from 'rampart-monad'

const count = await getBeanPairCount()
console.log(`Bean pairs deployed: ${count}`)

import { getBeanPairs } from 'rampart-monad'

const pairs = await getBeanPairs()

// Find pairs with meaningful reserves
const liquidPairs = pairs.filter(
  p => p.reserve0 > 0n && p.reserve1 > 0n
)
console.log(`Active pairs: ${liquidPairs.length}/${pairs.length}`)

// Sort by bin step to find stableswap-style pools
const stablePairs = liquidPairs
  .filter(p => p.binStep <= 5)
  .sort((a, b) => a.binStep - b.binStep)
console.log('Stable-like pairs:', stablePairs)

import { getBeanPairs } from 'rampart-monad'

// Poll prices every block (~400ms on Monad)
const pairs = await getBeanPairs()
const targetPair = pairs.find(
  p => p.token0 === '0x...' || p.token1 === '0x...'
)

if (targetPair) {
  console.log(`Current price: ${targetPair.price}`)
  console.log(`Active bin: ${targetPair.activeId}`)
}

Bean leverages Monad’s ~400ms block times for responsive bin transitions. In volatile markets, the active bin ID changes frequently - poll with getBeanPairs() rather than caching prices for extended periods.

Contract Addresses

Contract	Address
Factory	`0xb0Bd8567b80bB0a24ec92d1e85e5d28b4285e2E4`

Getting Started

Lending

Liquid Staking

Liquid Restaking

DEX & AMM

CLOB & Trading

Perpetuals

Yield

Aggregators

Oracles

Launchpad

Streaming

Indexer

AI Agent

Overview

Functions

getBeanPairs()

getBeanPairCount()

Contract Addresses

​Overview

​Functions

​getBeanPairs()

​getBeanPairCount()

​Contract Addresses

Overview

Functions

getBeanPairs()

getBeanPairCount()

Contract Addresses