Removing Liquidity

Overview​

This guide details how to pull liquidity from a Saros DLMM pool via your frontend. You can either partially decrease an existing position or close it entirely in one transaction.

Key steps:

1. Calculating the shares to remove

2. Calling the appropriate instruction

Decreasing a Position​

To remove some liquidity from an existing position:

1. Calculate the shares to remove from each bin

2. Call the decrease_position instruction with these parameters

Example Code

import { PublicKey, SystemProgram } from "@solana/web3.js";
import { BN } from "@project-serum/anchor";
import { TOKEN_2022_PROGRAM_ID, TOKEN_PROGRAM_ID } from "@solana/spl-token";

// Define the shares to remove from each bin
// The number of shares must match the position width (upper_bin_id - lower_bin_id + 1)
const sharesToRemove = [
  new BN(100000), // Shares to remove from bin 1
  new BN(200000), // Shares to remove from bin 2
  new BN(300000), // Shares to remove from bin 3
  // ... and so on for each bin in the position
];

// Derive bin array PDAs
const [binArrayLowerPda] = PublicKey.findProgramAddressSync(
  [Buffer.from("bin_array"), pairPda.toBuffer(), Buffer.from([0])],
  program.programId
);

const [binArrayUpperPda] = PublicKey.findProgramAddressSync(
  [Buffer.from("bin_array"), pairPda.toBuffer(), Buffer.from([1])],
  program.programId
);

await program.methods
  .decreasePosition(sharesToRemove)
  .accounts({
    pair: pairPda,
    position: positionPda,
    binArrayLower: binArrayLowerPda,
    binArrayUpper: binArrayUpperPda,
    tokenMintX: tokenMintX,
    tokenMintY: tokenMintY,
    tokenVaultX: tokenVaultXPda,
    tokenVaultY: tokenVaultYPda,
    userVaultX: userVaultXPda,
    userVaultY: userVaultYPda,
    positionTokenAccount: positionTokenAccount,
    tokenProgramX: TOKEN_PROGRAM_ID,
    tokenProgramY: TOKEN_PROGRAM_ID,
    positionTokenProgram: TOKEN_2022_PROGRAM_ID,
    user: wallet.publicKey,
  })
  .signers([wallet.payer])
  .rpc();

Closing a Position​

To completely close a position and remove all liquidity:

1. Call the close_position instruction

Example Code​

import { PublicKey, SystemProgram } from "@solana/web3.js";
import { TOKEN_2022_PROGRAM_ID, TOKEN_PROGRAM_ID } from "@solana/spl-token";

// Derive bin array PDAs
const [binArrayLowerPda] = PublicKey.findProgramAddressSync(
  [Buffer.from("bin_array"), pairPda.toBuffer(), Buffer.from([0])],
  program.programId
);

const [binArrayUpperPda] = PublicKey.findProgramAddressSync(
  [Buffer.from("bin_array"), pairPda.toBuffer(), Buffer.from([1])],
  program.programId
);

await program.methods
  .closePosition()
  .accounts({
    pair: pairPda,
    position: positionPda,
    binArrayLower: binArrayLowerPda,
    binArrayUpper: binArrayUpperPda,
    tokenMintX: tokenMintX,
    tokenMintY: tokenMintY,
    tokenVaultX: tokenVaultXPda,
    tokenVaultY: tokenVaultYPda,
    userVaultX: userVaultXPda,
    userVaultY: userVaultYPda,
    positionTokenAccount: positionTokenAccount,
    tokenProgramX: TOKEN_PROGRAM_ID,
    tokenProgramY: TOKEN_PROGRAM_ID,
    positionTokenProgram: TOKEN_2022_PROGRAM_ID,
    user: wallet.publicKey,
  })
  .signers([wallet.payer])
  .rpc();

Calculating Shares to Remove​

When decreasing a position, you need to specify the number of shares to remove from each bin. The number of shares must match the position width (upper_bin_id - lower_bin_id + 1).

You can calculate the shares to remove based on:

• The percentage of liquidity you want to remove

• The current liquidity in each bin

Example Calculation

// Calculate shares to remove based on percentage
const calculateSharesToRemove = (position, percentageToRemove) => {
  const positionWidth = position.upper_bin_id - position.lower_bin_id + 1;
  const sharesToRemove = [];
  
  for (let i = 0; i < positionWidth; i++) {
    const currentShares = position.liquidity_shares[i];
    const sharesToRemoveFromBin = currentShares.mul(new BN(percentageToRemove)).div(new BN(10000));
    sharesToRemove.push(sharesToRemoveFromBin);
  }
  
  return sharesToRemove;
};

// Example: Remove 50% of liquidity from a position
const sharesToRemove = calculateSharesToRemove(position, 5000);

• width: number of bins in the position

• liquidity_shares: existing shares per bin

• percentageToRemove: e.g. 5000 = 50%