Stable AMM code demos

npm install @raydium-io/raydium-sdk-v2 @solana/web3.js @solana/spl-token

import { Raydium, TxVersion } from "@raydium-io/raydium-sdk-v2";
import { Connection, Keypair, clusterApiUrl } from "@solana/web3.js";
import BN from "bn.js";
import bs58 from "bs58";

const connection = new Connection(clusterApiUrl("mainnet-beta"));
const owner = Keypair.fromSecretKey(bs58.decode(process.env.PRIVATE_KEY!));

const raydium = await Raydium.load({
  connection,
  owner,
  cluster: "mainnet",
  // Optional: load the stable curve model layout if you intend to call quoting
  // helpers from `liquidity/stable.ts` directly. Pool-level swap / add / remove
  // do this lazily for you, so most callers can skip this step.
});

// One-time: prefetch the on-chain model data layout used by the off-chain
// stable-curve helpers. Only needed if you call getStablePrice / getDxByDyBaseIn /
// getDyByDxBaseIn directly. addLiquidity / removeLiquidity / swap don't need this.
await raydium.liquidity.initLayout();

const isStable =
  pool.version === 5 ||
  pool.pooltype.includes("StablePool"); // the SDK uses this string check internally

// Alternatively, by program ID:
const STABLE_AMM_PROGRAM_ID = "5quBtoiQqxF9Jv6KYKctB59NT3gtJD2Y65kdnB1Uev3h";
const isStableByProgram = pool.programId === STABLE_AMM_PROGRAM_ID;

import { PublicKey } from "@solana/web3.js";

// Two common mints to use as an example
const mintA = new PublicKey("Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB"); // USDT
const mintB = new PublicKey("EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"); // USDC

const pools = await raydium.api.fetchPoolByMintPair({
  mint1: mintA.toBase58(),
  mint2: mintB.toBase58(),
});

const stablePool = pools.find(
  (p) => p.version === 5 || p.pooltype.includes("StablePool"),
);

if (!stablePool) {
  throw new Error("No Stable pool exists for this mint pair");
}

console.log("Stable pool id:", stablePool.id);
console.log("Stable pool programId:", stablePool.programId);
console.log("TVL:", stablePool.tvl);

import { Percent, TokenAmount, toToken } from "@raydium-io/raydium-sdk-v2";

const inputAmount = new TokenAmount(toToken(stablePool.mintA), 1_000_000); // 1 USDT
const slippage = new Percent(50, 10_000); // 0.5%

// Compute expected output using the SDK's stable-curve helpers internally.
const { amountOut, minAmountOut } = raydium.liquidity.computeAmountOut({
  poolInfo: stablePool,
  amountIn: inputAmount,
  mintIn:  stablePool.mintA.address,
  mintOut: stablePool.mintB.address,
  slippage,
});

console.log("Expected out:", amountOut.toSignificant());
console.log("Minimum out:", minAmountOut.toSignificant());

// Build & sign the swap transaction.
const { transaction, execute } = await raydium.liquidity.swap({
  poolInfo: stablePool,
  amountIn:    inputAmount.raw,
  amountOut:   minAmountOut.raw,
  fixedSide:   "in",
  txVersion:   TxVersion.V0,
});

const { txId } = await execute({ sendAndConfirm: true });
console.log("Stable swap tx:", txId);

import { Percent, TokenAmount, toToken } from "@raydium-io/raydium-sdk-v2";

const amountInA = new TokenAmount(toToken(stablePool.mintA), 100_000_000); // 100 USDT
const slippage  = new Percent(50, 10_000); // 0.5%

// Compute the matching B amount the curve requires for this size of A.
const { anotherAmount, minAnotherAmount } = raydium.liquidity.computePairAmount({
  poolInfo: stablePool,
  amount:   amountInA.toSignificant(),
  baseIn:   true,
  slippage,
});

const { execute } = await raydium.liquidity.addLiquidity({
  poolInfo: stablePool,
  amountInA,
  amountInB:      anotherAmount,
  otherAmountMin: minAnotherAmount,
  fixedSide:      "a",
  txVersion:      TxVersion.V0,
});

const { txId } = await execute({ sendAndConfirm: true });
console.log("Add-liquidity tx:", txId);

import {
  getStablePrice,
  getDxByDyBaseIn,
  getDyByDxBaseIn,
} from "@raydium-io/raydium-sdk-v2";

// You must call initLayout() once before using these (loads the on-chain
// `ModelDataInfo` PDA into the SDK's StableLayout cache).
await raydium.liquidity.initLayout();

const modelData = raydium.liquidity.stableLayout;

// Spot price at the pool's current reserves.
const price = getStablePrice(modelData, /* x */, /* y */, /* withFee */);
console.log("Spot price:", price);

// Quote: given dx in, how much dy out (no fee applied here)?
const dyOut = getDyByDxBaseIn(modelData, /* x */, /* y */, /* dx */);

// Quote: given dy out target, how much dx in needed?
const dxIn  = getDxByDyBaseIn(modelData, /* x */, /* y */, /* dy */);

const route = await raydium.tradeV2.fetchRoutes({
  inputMint:  mintA,
  outputMint: mintB,
  amount:     new BN(1_000_000),
  slippage,
});

// route.routes[0].poolType tells you which programs the best route uses;
// "Stable" appears here whenever a Stable pool is part of the optimal path.
console.log(route.routes[0]);

const { execute } = await raydium.tradeV2.swap({
  inputMint:    mintA,
  outputMint:   mintB,
  inputAmount:  new BN(1_000_000),
  swapResult:   route.routes[0],
  slippage,
  txVersion:    TxVersion.V0,
});

const { txId } = await execute({ sendAndConfirm: true });