Zap-In & Zap-Out via API

What You’ll Build

By the end of this tutorial, you’ll know how to programmatically:

Zap-In — Find a pool and add liquidity with a single token (SOL)
Zap-Out — Withdraw your liquidity back to your wallet

No smart contract knowledge required — LP Agent handles everything through simple REST APIs.

LP Agent provides built-in transaction landing via Jito bundles for both zap-in and zap-out. This gives you a significantly better landing rate than submitting transactions directly via RPC — and it’s free to use.

How It Works

The Zap-In Flow

Adding liquidity to a Meteora pool involves 4 steps:

1. DISCOVER       Find a pool that matches your criteria
   GET /pools/discover
        ↓
2. GET POOL INFO   Get the current active bin (price) to set your range
   GET /pools/{poolId}/info
        ↓
3. GENERATE TXS   API creates unsigned transactions for you
   POST /pools/{poolId}/add-tx
        ↓
4. SIGN & LAND     Sign with your wallet, submit via Jito
   POST /pools/landing-add-tx

What is “zap-in”? You provide just SOL, and the API automatically swaps it into the correct ratio of both tokens before adding liquidity. No need to manually buy tokens first.

The Zap-Out Flow

Withdrawing liquidity follows a similar pattern:

1. GET POSITIONS   Find your open positions
   GET /lp-positions/opening
        ↓
2. GET QUOTES      (Optional) Preview what you'll receive
   POST /position/decrease-quotes
        ↓
3. GENERATE TXS   API creates unsigned withdrawal transactions
   POST /position/decrease-tx
        ↓
4. SIGN & LAND     Sign with your wallet, submit via Jito
   POST /position/landing-decrease-tx

Understanding Key Concepts

Before diving into code, here are the key concepts:

Concept	What It Means
Bin	A price point in a Meteora DLMM pool. Liquidity is placed across a range of bins.
Active Bin	The bin where the current price sits. Your position earns fees when the price is within your bin range.
Strategy	How liquidity is distributed across bins — `Spot` (uniform), `Curve` (concentrated in middle), or `BidAsk` (concentrated at edges).
BPS	Basis points. 10000 = 100%, 5000 = 50%, 500 = 5%. Used for slippage and withdrawal amounts.
Landing	Submitting signed transactions on-chain. LP Agent uses Jito bundles for better success rates.

Prerequisites

An LP Agent API key (get one from the API Dashboard)
A Solana wallet keypair
Node.js >= 18

npm install @solana/web3.js bs58

Step-by-Step: Zap-In

Step 1: Setup

First, set up your API client and wallet:

import { Keypair, Transaction, VersionedTransaction } from "@solana/web3.js";
import bs58 from "bs58";

const API_BASE = "https://api.lpagent.io/open-api/v1";
const API_KEY = "your-api-key-here";

const wallet = Keypair.fromSecretKey(bs58.decode("your-base58-private-key"));
const OWNER = wallet.publicKey.toBase58();

// Helper for API calls
async function apiCall(method: string, path: string, body?: object) {
  const res = await fetch(`${API_BASE}${path}`, {
    method,
    headers: {
      "Content-Type": "application/json",
      "x-api-key": API_KEY,
    },
    body: body ? JSON.stringify(body) : undefined,
  });

  if (!res.ok) {
    const error = await res.json();
    throw new Error(`API error: ${JSON.stringify(error)}`);
  }

  return res.json();
}

// Sign a base64-encoded transaction (handles both legacy and versioned)
function signTransaction(base64Tx: string): string {
  const buffer = Buffer.from(base64Tx, "base64");

  try {
    const tx = VersionedTransaction.deserialize(buffer);
    tx.sign([wallet]);
    return Buffer.from(tx.serialize()).toString("base64");
  } catch {
    const tx = Transaction.from(buffer);
    tx.partialSign(wallet);
    return tx
      .serialize({ requireAllSignatures: false, verifySignatures: false })
      .toString("base64");
  }
}

Step 2: Discover a Pool

Browse available pools and filter by your criteria. The API returns pools sorted by your chosen metric.

const discoverRes = await apiCall("GET",
  "/pools/discover?" + new URLSearchParams({
    chain: "SOL",
    sortBy: "vol_24h",        // sort by 24h volume
    sortOrder: "desc",
    pageSize: "5",
    min_market_cap: "5",       // min $5M market cap
    min_liquidity: "50",       // min $50K TVL
  }).toString()
);

const pool = discoverRes.data[0];
console.log(`Pool: ${pool.token0_symbol}/${pool.token1_symbol} (${pool.pool})`);
console.log(`Protocol: ${pool.protocol}`); // "meteora" or "meteora_damm_v2"

What you get back: A list of pools with their addresses, token pairs, TVL, volume, and protocol type. The API supports both Meteora DLMM and DAMM V2 pools — the same code works for both.

Step 3: Get Pool Info & Set Your Range

Fetch the pool’s current state to find the active bin (where the current price is). You’ll place liquidity around this bin.

const poolInfoRes = await apiCall("GET", `/pools/${pool.pool}/info`);
const activeBin = poolInfoRes.data.liquidityViz?.activeBin;

// Place liquidity 34 bins on each side of the current price
const RANGE = 34;
const fromBinId = activeBin.binId - RANGE;
const toBinId = activeBin.binId + RANGE;

console.log(`Active bin: ${activeBin.binId}`);
console.log(`Your range: bin ${fromBinId} to ${toBinId} (${RANGE * 2 + 1} bins)`);

How to choose your range: Wider = less risk of going out of range, but lower fee APR. Tighter = higher fees but more frequent rebalancing needed. Start with 30-70 bins on each side.

Step 4: Generate Zap-In Transactions

Tell the API how much SOL you want to deposit. It generates unsigned transactions that swap your SOL into the right token ratio and add liquidity.

const addTxRes = await apiCall("POST", `/pools/${pool.pool}/add-tx`, {
  stratergy: "Spot",           // distribution strategy
  inputSOL: 0.1,               // amount of SOL to deposit
  percentX: 0.5,               // 50/50 split between tokens
  fromBinId,
  toBinId,
  owner: OWNER,
  slippage_bps: 500,           // 5% slippage tolerance
  mode: "zap-in",              // auto-swap SOL to both tokens
});

console.log(`Position key: ${addTxRes.data.meta.positionPubKey}`);
console.log(`Swap txs: ${addTxRes.data.swapTxsWithJito.length}`);
console.log(`Add txs: ${addTxRes.data.addLiquidityTxsWithJito.length}`);

Already holding both tokens? Use mode: "normal" with amountX and amountY instead of inputSOL to skip the swap step.

What you get back: Base64-encoded unsigned transactions, split into swap transactions (to convert SOL) and add-liquidity transactions. Plus metadata about your new position.

Step 5: Sign & Land

Sign the transactions with your wallet and submit them via LP Agent’s Jito landing endpoint.

const { lastValidBlockHeight, swapTxsWithJito, addLiquidityTxsWithJito, meta } = addTxRes.data;

// Sign all transactions with your wallet
const signedSwapTxs = swapTxsWithJito.map(signTransaction);
const signedAddTxs = addLiquidityTxsWithJito.map(signTransaction);

// Submit via LP Agent's Jito integration (better landing rate — free!)
const landRes = await apiCall("POST", "/pools/landing-add-tx", {
  lastValidBlockHeight,
  swapTxsWithJito: signedSwapTxs,
  addLiquidityTxsWithJito: signedAddTxs,
  meta,
});

console.log(`Zap-In Success! Tx: https://solscan.io/tx/${landRes.data.signature}`);

That’s it! Your liquidity is now live and earning fees.

Step-by-Step: Zap-Out

Step 1: Find Your Open Positions

Query your wallet to see all open LP positions.

const positionsRes = await apiCall("GET",
  `/lp-positions/opening?owner=${OWNER}`
);

console.log(`Found ${positionsRes.count} open positions`);

for (const pos of positionsRes.data) {
  console.log(`- ${pos.pairName} | Value: $${pos.currentValue} | PnL: ${pos.pnl.percent.toFixed(2)}% | In Range: ${pos.inRange}`);
}

What you get back: Each position includes its encrypted ID (needed for withdrawal), current value, PnL, whether it’s in range, and token details.

Step 2: Get Quotes (Optional)

Preview what you’ll receive before withdrawing. The API shows quotes for different output options.

const positionId = positionsRes.data[0].id; // encrypted position ID

const quotesRes = await apiCall("POST", "/position/decrease-quotes", {
  id: positionId,
  bps: 10000,    // 10000 = 100% withdrawal, 5000 = 50%, etc.
});

const quotes = quotesRes.data;
console.log(`Token prices: $${quotes.price.token0} / $${quotes.price.token1}`);

Step 3: Generate Zap-Out Transactions

Choose how much to withdraw and what token(s) to receive.

const decreaseTxRes = await apiCall("POST", "/position/decrease-tx", {
  position_id: positionId,
  bps: 10000,                  // 100% withdrawal
  owner: OWNER,
  slippage_bps: 500,
  output: "allBaseToken",      // withdraw to SOL (see table below)
  provider: "JUPITER_ULTRA",
});

console.log(`Generated ${decreaseTxRes.data.closeTxsWithJito.length} close txs`);

Output options:

Output	Description
`allBaseToken`	Swap everything to SOL (recommended for easy re-entry)
`both`	Receive both tokens as-is (no swap)
`allToken0`	Swap everything to token X
`allToken1`	Swap everything to token Y

Step 4: Sign & Land

const { lastValidBlockHeight: blockHeight, closeTxsWithJito, swapTxsWithJito } = decreaseTxRes.data;

// Sign all transactions
const signedCloseTxs = closeTxsWithJito.map(signTransaction);
const signedSwapTxs = swapTxsWithJito.map(signTransaction);

// Submit via LP Agent's Jito integration
const landRes = await apiCall("POST", "/position/landing-decrease-tx", {
  lastValidBlockHeight: blockHeight,
  closeTxs: [],
  swapTxs: [],
  closeTxsWithJito: signedCloseTxs,
  swapTxsWithJito: signedSwapTxs,
});

console.log(`Zap-Out Success! Tx: https://solscan.io/tx/${landRes.data.signature}`);

Always use the landing-decrease-tx endpoint instead of submitting transactions directly via RPC. LP Agent’s Jito integration provides a much better landing rate and it’s completely free.

Reference

Strategy Types

Strategy	Description	Best For
`Spot`	Uniform distribution across all bins	Stable pairs (SOL/USDC)
`Curve`	Bell curve concentrated around active bin	Range-bound markets
`BidAsk`	Heavier allocation at the edges	Volatile pairs with mean reversion

Common Errors

Error	Cause	Fix
`Token X price unavailable`	Price feed missing	Try again later or use a different pool
`Insufficient balance`	Not enough tokens	Reduce `inputSOL` or `amountX`/`amountY`
`Missing amount to ZapIn`	`inputSOL` not provided in zap-in mode	Add `inputSOL` to the request body
Transaction expired	`lastValidBlockHeight` has passed	Re-generate and re-sign (don’t wait more than ~60s)

Tips

Transaction landing: Always use LP Agent’s landing endpoints instead of direct RPC. Better success rates via Jito — for free.
DAMM V2 pools: Both zap-in and zap-out auto-detect pool types. The same code works for DLMM and DAMM V2.
Partial zap-out: Use bps less than 10000 to withdraw only a portion (e.g., 5000 = 50%).

Complete Script

Here’s everything above combined into a single copy-paste-ready script:

Full zap-in + zap-out script

import { Keypair, Transaction, VersionedTransaction } from "@solana/web3.js";
import bs58 from "bs58";

const API_BASE = "https://api.lpagent.io/open-api/v1";
const API_KEY = "your-api-key-here";
const wallet = Keypair.fromSecretKey(bs58.decode("your-base58-private-key"));
const OWNER = wallet.publicKey.toBase58();

async function apiCall(method: string, path: string, body?: object) {
  const res = await fetch(`${API_BASE}${path}`, {
    method,
    headers: { "Content-Type": "application/json", "x-api-key": API_KEY },
    body: body ? JSON.stringify(body) : undefined,
  });
  if (!res.ok) throw new Error(`API error: ${await res.text()}`);
  return res.json();
}

function signTx(base64Tx: string): string {
  const buffer = Buffer.from(base64Tx, "base64");
  try {
    const tx = VersionedTransaction.deserialize(buffer);
    tx.sign([wallet]);
    return Buffer.from(tx.serialize()).toString("base64");
  } catch {
    const tx = Transaction.from(buffer);
    tx.partialSign(wallet);
    return tx.serialize({ requireAllSignatures: false, verifySignatures: false }).toString("base64");
  }
}

// ===================== ZAP-IN =====================
async function zapIn(poolAddress: string, amountSOL: number) {
  const info = await apiCall("GET", `/pools/${poolAddress}/info`);
  const activeBin = info.data.liquidityViz?.activeBin;
  const fromBinId = activeBin.binId - 34;
  const toBinId = activeBin.binId + 34;

  const addTx = await apiCall("POST", `/pools/${poolAddress}/add-tx`, {
    stratergy: "Spot",
    inputSOL: amountSOL,
    percentX: 0.5,
    fromBinId,
    toBinId,
    owner: OWNER,
    slippage_bps: 500,
    mode: "zap-in",
  });

  const signedSwapTxs = addTx.data.swapTxsWithJito.map(signTx);
  const signedAddTxs = addTx.data.addLiquidityTxsWithJito.map(signTx);

  const result = await apiCall("POST", "/pools/landing-add-tx", {
    lastValidBlockHeight: addTx.data.lastValidBlockHeight,
    swapTxsWithJito: signedSwapTxs,
    addLiquidityTxsWithJito: signedAddTxs,
    meta: addTx.data.meta,
  });

  console.log(`Zap-In done: https://solscan.io/tx/${result.data.signature}`);
  return addTx.data.meta.positionPubKey;
}

// ===================== ZAP-OUT =====================
async function zapOut(positionId: string, bps: number = 10000) {
  const decreaseTx = await apiCall("POST", "/position/decrease-tx", {
    position_id: positionId,
    bps,
    owner: OWNER,
    slippage_bps: 500,
    output: "allBaseToken",
  });

  const signedCloseTxs = decreaseTx.data.closeTxsWithJito.map(signTx);
  const signedSwapTxs = decreaseTx.data.swapTxsWithJito.map(signTx);

  const result = await apiCall("POST", "/position/landing-decrease-tx", {
    lastValidBlockHeight: decreaseTx.data.lastValidBlockHeight,
    closeTxs: [],
    swapTxs: [],
    closeTxsWithJito: signedCloseTxs,
    swapTxsWithJito: signedSwapTxs,
  });

  console.log(`Zap-Out done: https://solscan.io/tx/${result.data.signature}`);
}

// ===================== MAIN =====================
async function main() {
  // Discover a pool
  const discover = await apiCall("GET", "/pools/discover?" + new URLSearchParams({
    chain: "SOL", sortBy: "vol_24h", sortOrder: "desc", pageSize: "1",
  }));
  const pool = discover.data[0];
  console.log(`Pool: ${pool.token0_symbol}/${pool.token1_symbol}`);

  // Zap-In: add 0.1 SOL of liquidity
  const positionKey = await zapIn(pool.pool, 0.1);
  console.log(`Position created: ${positionKey}`);

  // Check position status
  const positions = await apiCall("GET", `/lp-positions/opening?owner=${OWNER}`);
  const position = positions.data.find((p: any) => p.pool === pool.pool);
  if (position) {
    console.log(`Position value: $${position.currentValue}, PnL: ${position.pnl.percent}%`);

    // Zap-Out: withdraw 100% to SOL
    await zapOut(position.id, 10000);
  }
}

main().catch(console.error);

Next Steps

Auto-Rebalancing Bot — Build a bot that monitors and rebalances positions automatically
Explore the full API Reference for all available endpoints

API Tutorials

Best Practices

What You’ll Build

How It Works

The Zap-In Flow

The Zap-Out Flow

Understanding Key Concepts

Prerequisites

Step-by-Step: Zap-In

Step 1: Setup

Step 2: Discover a Pool

Step 3: Get Pool Info & Set Your Range

Step 4: Generate Zap-In Transactions

Step 5: Sign & Land

Step-by-Step: Zap-Out

Step 1: Find Your Open Positions

Step 2: Get Quotes (Optional)

Step 3: Generate Zap-Out Transactions

Step 4: Sign & Land

Reference

Strategy Types

Common Errors

Tips

Complete Script

Next Steps

API Tutorials

Best Practices

​What You’ll Build

​How It Works

​The Zap-In Flow

​The Zap-Out Flow

​Understanding Key Concepts

​Prerequisites

​Step-by-Step: Zap-In

​Step 1: Setup

​Step 2: Discover a Pool

​Step 3: Get Pool Info & Set Your Range

​Step 4: Generate Zap-In Transactions

​Step 5: Sign & Land

​Step-by-Step: Zap-Out

​Step 1: Find Your Open Positions

​Step 2: Get Quotes (Optional)

​Step 3: Generate Zap-Out Transactions

​Step 4: Sign & Land

​Reference

​Strategy Types

​Common Errors

​Tips

​Complete Script

​Next Steps

What You’ll Build

How It Works

The Zap-In Flow

The Zap-Out Flow

Understanding Key Concepts

Prerequisites

Step-by-Step: Zap-In

Step 1: Setup

Step 2: Discover a Pool

Step 3: Get Pool Info & Set Your Range

Step 4: Generate Zap-In Transactions

Step 5: Sign & Land

Step-by-Step: Zap-Out

Step 1: Find Your Open Positions

Step 2: Get Quotes (Optional)

Step 3: Generate Zap-Out Transactions

Step 4: Sign & Land

Reference

Strategy Types

Common Errors

Tips

Complete Script

Next Steps