Swap from CLI

Paste-and-go Node script that quotes and executes a CPMM swap. Configure four env vars and run it.

What this does. Loads a CPMM pool from RPC, quotes a swap with 0.5% slippage, builds the transaction, signs with your keypair, and submits it. End-to-end in ~30 lines.

Setup

Make sure you’ve read the Quick start prerequisites and have RPC_URL, KEYPAIR, and the deps installed.

The script

Save as swap.mjs:

// swap.mjs
import { Connection, Keypair, PublicKey } from "@solana/web3.js";
import { Raydium, TxVersion, CurveCalculator } from "@raydium-io/raydium-sdk-v2";
import BN from "bn.js";
import fs from "node:fs";

// ── Config from env ──────────────────────────────────────────────
const RPC_URL    = process.env.RPC_URL    ?? "https://api.mainnet-beta.solana.com";
const KEYPAIR    = process.env.KEYPAIR    ?? `${process.env.HOME}/.config/solana/id.json`;
const POOL_ID    = process.env.POOL_ID;     // required, base58
const INPUT_MINT = process.env.INPUT_MINT;  // required, base58
const AMOUNT_RAW = process.env.AMOUNT_RAW;  // required, integer in raw units (e.g. 1_000_000_000 for 1 SOL)

if (!POOL_ID || !INPUT_MINT || !AMOUNT_RAW) {
  console.error("Set POOL_ID, INPUT_MINT, AMOUNT_RAW env vars.");
  process.exit(1);
}

// ── Setup ────────────────────────────────────────────────────────
const connection = new Connection(RPC_URL, "confirmed");
const owner = Keypair.fromSecretKey(
  new Uint8Array(JSON.parse(fs.readFileSync(KEYPAIR, "utf8"))),
);
const raydium = await Raydium.load({
  owner,
  connection,
  cluster: "mainnet",
  disableFeatureCheck: true,
  blockhashCommitment: "finalized",
});

// ── Load pool ────────────────────────────────────────────────────
const { poolInfo, poolKeys, rpcData } =
  await raydium.cpmm.getPoolInfoFromRpc(new PublicKey(POOL_ID));

const baseIn = poolInfo.mintA.address === INPUT_MINT;

// ── Quote ────────────────────────────────────────────────────────
const inputAmount = new BN(AMOUNT_RAW);
const swapResult  = CurveCalculator.swap(
  inputAmount,
  baseIn ? rpcData.baseReserve : rpcData.quoteReserve,
  baseIn ? rpcData.quoteReserve : rpcData.baseReserve,
  rpcData.configInfo.tradeFeeRate,
);

console.log(`Quote: ${inputAmount.toString()} -> ${swapResult.destinationAmountSwapped.toString()}`);
console.log(`Fee:   ${swapResult.tradeFee.toString()}`);

// ── Build and execute ────────────────────────────────────────────
const { execute } = await raydium.cpmm.swap({
  poolInfo,
  poolKeys,
  inputAmount,
  swapResult,
  slippage: 0.005, // 0.5%
  baseIn,
  txVersion: TxVersion.V0,
  computeBudgetConfig: {
    units: 250_000,
    microLamports: 50_000,
  },
});

const { txId } = await execute({ sendAndConfirm: true });
console.log(`Swap landed: https://solscan.io/tx/${txId}`);

Run it

Pick any CPMM pool you have liquidity for. Example with the canonical SOL/USDC CPMM pool:

export POOL_ID="<paste a CPMM pool ID — find one in Raydium UI's Pools tab>"
export INPUT_MINT="So11111111111111111111111111111111111111112"
export AMOUNT_RAW="10000000"   # 0.01 SOL

node swap.mjs

Expected output:

Quote: 10000000 -> 1640000
Fee:   25000
Swap landed: https://solscan.io/tx/4Z9...

What just happened

1. Raydium.load initialised the SDK — fetched the global config, set up your wallet context.
2. getPoolInfoFromRpc pulled the live pool state directly from RPC (not from the API cache). For high-value swaps you always want fresh state.
3. CurveCalculator.swap computed the constant-product output net of the pool’s fee. This is the same math the program runs on-chain, so you can compare quotes off- and on-chain.
4. raydium.cpmm.swap built the transaction with V0 format (address lookup tables enabled) and added an explicit compute-budget config. The compute-budget tip helps the tx land in busy windows.
5. execute({ sendAndConfirm: true }) signed, sent, and waited for confirmation.

Common errors

• Pool not found — Wrong POOL_ID, or you’re pointed at the wrong cluster (mainnet pool ID against a devnet RPC, etc.).
• Insufficient funds for transaction — Your wallet doesn’t have enough SOL for the swap input + fees + ATA rent.
• Slippage tolerance exceeded — The pool’s price moved between quote and execution. Re-run; or raise the slippage parameter; or use the SDK’s computeAmountOut which always re-fetches reserves.
• Token account not initialized — Output token’s ATA didn’t exist and the implicit-create instruction landed but failed for some reason; check your wallet’s SOL balance and try again.

Next

• sdk-api/typescript-sdk — full SDK reference.
• products/cpmm/instructions — what the swap instruction looks like on-chain.
• integration-guides/priority-fee-tuning — sizing computeBudgetConfig for production.