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" });

// REQUIRED before any Stable-pool quoting. initLayout() fetches the on-chain
// ModelDataInfo lookup table into raydium.liquidity.stableLayout.
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";
import type { ApiV3PoolInfoStandardItem } from "@raydium-io/raydium-sdk-v2";

// Two common mints to use as an example
const mintA = new PublicKey("Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB"); // USDT — see reference/program-addresses
const mintB = new PublicKey("EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v"); // USDC

// fetchPoolByMints returns a paged envelope: { count, data, hasNextPage }
const res = await raydium.api.fetchPoolByMints({
  mint1: mintA.toBase58(),
  mint2: mintB.toBase58(),
});

const stablePool = res.data.find(
  (p) => p.version === 5 || p.pooltype.includes("StablePool"),
) as ApiV3PoolInfoStandardItem | undefined;

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 BN from "bn.js";

const amountIn = new BN(1_000_000); // 1 USDT (6 decimals), raw units

// Live reserves + status. On mainnet you can also take poolKeys from
// getAmmPoolKeys(poolId) and reserves from getRpcPoolInfo(poolId).
const rpcData  = await raydium.liquidity.getRpcPoolInfo(stablePool.id);
const poolKeys = await raydium.liquidity.getAmmPoolKeys(stablePool.id);

const out = raydium.liquidity.computeAmountOut({
  poolInfo: {
    ...stablePool,
    baseReserve:  rpcData.baseReserve,
    quoteReserve: rpcData.quoteReserve,
    status:       rpcData.status.toNumber(),
    version:      5, // 5 = Stable; the curve branch is selected on this
  },
  amountIn,
  mintIn:  stablePool.mintA.address,
  mintOut: stablePool.mintB.address,
  slippage: 0.005, // plain number: 0.005 = 0.5% (range 1 ~ 0.0001)
});

// amountOut / minAmountOut are BN in raw units, not TokenAmount.
console.log("Expected out:", out.amountOut.toString());
console.log("Minimum out:", out.minAmountOut.toString());

// Build & sign the swap transaction. `inputMint` is required — without it the
// SDK cannot tell which side of the pool you are selling.
const { transaction, execute } = await raydium.liquidity.swap({
  poolInfo:  stablePool,
  poolKeys,
  amountIn,
  amountOut: out.minAmountOut, // out.amountOut is the pre-slippage figure
  inputMint: stablePool.mintA.address,
  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";
import Decimal from "decimal.js";

const inputAmount = "100"; // 100 USDT, in human units — computePairAmount takes a decimal string

// Compute the matching B amount the curve requires for this size of A.
// Note: computePairAmount's slippage IS a Percent (unlike computeAmountOut's).
const r = raydium.liquidity.computePairAmount({
  poolInfo: stablePool,
  amount:   inputAmount,
  baseIn:   true,
  slippage: new Percent(50, 10_000), // 0.5%
});

const { execute } = await raydium.liquidity.addLiquidity({
  poolInfo: stablePool,
  poolKeys,
  amountInA: new TokenAmount(
    toToken(stablePool.mintA),
    new Decimal(inputAmount).mul(10 ** stablePool.mintA.decimals).toFixed(0),
  ),
  amountInB: new TokenAmount(
    toToken(stablePool.mintB),
    new Decimal(r.maxAnotherAmount.toExact()).mul(10 ** stablePool.mintB.decimals).toFixed(0),
  ),
  otherAmountMin: r.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();

// initLayout() populates the StableLayout instance; the plain data object the
// three helpers below expect is its `stableModelData` getter, NOT the instance.
const modelData = raydium.liquidity.stableLayout.stableModelData;

// Reserves are passed as plain numbers in human units (not BN, not raw units).
const coinReserve = 1_200_000; // pool's coin-side reserve
const pcReserve   = 1_150_000; // pool's pc-side reserve

// Spot price at the pool's current reserves. The 4th argument is `baseCoin`:
// true returns coin-per-pc, false returns the reciprocal.
const price = getStablePrice(modelData, coinReserve, pcReserve, true);
console.log("Spot price:", price);

// Quote: given dx in, how much dy out (no fee applied here)?
const dyOut = getDyByDxBaseIn(modelData, coinReserve, pcReserve, 1_000);

// Quote: given dy out target, how much dx in is needed?
const dxIn  = getDxByDyBaseIn(modelData, coinReserve, pcReserve, 1_000);

import { Router } from "@raydium-io/raydium-sdk-v2";

const poolData = await raydium.tradeV2.fetchRoutePoolBasicInfo(); // cache this
const routes   = raydium.tradeV2.getAllRoute({ inputMint: mintA, outputMint: mintB, ...poolData });
const ctx      = await raydium.tradeV2.fetchSwapRoutesData({ routes, inputMint: mintA, outputMint: mintB });
const quotes   = raydium.tradeV2.getAllRouteComputeAmountOut({ /* ...ctx, amount, slippage, ... */ });

const best = quotes[0]; // sorted best-first
if (!best) throw new Error("no swap routes were found");

// best.poolInfoList entries carry `version` — 5 marks a Stable pool in the path.
console.log(best.routeType, best.poolInfoList.map((p) => p.version));

const poolKeys = await raydium.tradeV2.computePoolToPoolKeys({
  pools: best.poolInfoList,
  ammRpcData:  ctx.ammPoolsRpcInfo,
  clmmRpcData: ctx.clmmPoolsRpcInfo,
});

const { execute } = await raydium.tradeV2.swap({
  routeProgram: Router,
  swapInfo:     best,
  swapPoolKeys: poolKeys,
  ownerInfo:    { associatedOnly: true, checkCreateATAOwner: true },
  txVersion:    TxVersion.V0,
});

// tradeV2.swap can return several transactions; the first creates intermediate ATAs.
const { txIds } = await execute({ sequentially: true });