diff --git a/.gitignore b/.gitignore
index 90bc25d3..81dda24d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ hfuzz_workspace
 **/.DS_Store
 test-ledger
 docker-target
+.idea
diff --git a/token-swap/js/cli/main.ts b/token-swap/js/cli/main.ts
index 3bc3dc61..54786f69 100644
--- a/token-swap/js/cli/main.ts
+++ b/token-swap/js/cli/main.ts
@@ -7,11 +7,16 @@ import {
   depositSingleTokenTypeExactAmountIn,
   withdrawSingleTokenTypeExactAmountOut,
 } from './token-swap-test';
+import {CurveType, Numberu64} from '../dist';
 
 async function main() {
   // These test cases are designed to run sequentially and in the following order
-  console.log('Run test: createTokenSwap');
-  await createTokenSwap();
+  console.log('Run test: createTokenSwap (constant price)');
+  await createTokenSwap(CurveType.ConstantPrice, new Numberu64(1));
+  console.log(
+    'Run test: createTokenSwap (constant product, used further in tests)',
+  );
+  await createTokenSwap(CurveType.ConstantProduct);
   console.log('Run test: deposit all token types');
   await depositAllTokenTypes();
   console.log('Run test: withdraw all token types');
diff --git a/token-swap/js/cli/token-swap-test.ts b/token-swap/js/cli/token-swap-test.ts
index 3aaf22e0..e9fb0440 100644
--- a/token-swap/js/cli/token-swap-test.ts
+++ b/token-swap/js/cli/token-swap-test.ts
@@ -12,6 +12,7 @@ import {sendAndConfirmTransaction} from '../src/util/send-and-confirm-transactio
 import {newAccountWithLamports} from '../src/util/new-account-with-lamports';
 import {url} from '../src/util/url';
 import {sleep} from '../src/util/sleep';
+import {Numberu64} from '../dist';
 
 // The following globals are created by `createTokenSwap` and used by subsequent tests
 // Token swap
@@ -46,9 +47,6 @@ const OWNER_WITHDRAW_FEE_DENOMINATOR = SWAP_PROGRAM_OWNER_FEE_ADDRESS ? 0 : 6;
 const HOST_FEE_NUMERATOR = 20;
 const HOST_FEE_DENOMINATOR = 100;
 
-// curve type used to calculate swaps and deposits
-const CURVE_TYPE = CurveType.ConstantProduct;
-
 // Initial amount in each swap token
 let currentSwapTokenA = 1000000;
 let currentSwapTokenB = 1000000;
@@ -88,7 +86,10 @@ async function getConnection(): Promise<Connection> {
   return connection;
 }
 
-export async function createTokenSwap(): Promise<void> {
+export async function createTokenSwap(
+  curveType: number,
+  curveParameters?: Numberu64,
+): Promise<void> {
   const connection = await getConnection();
   const payer = await newAccountWithLamports(connection, 1000000000);
   owner = await newAccountWithLamports(connection, 1000000000);
@@ -169,7 +170,8 @@ export async function createTokenSwap(): Promise<void> {
     OWNER_WITHDRAW_FEE_DENOMINATOR,
     HOST_FEE_NUMERATOR,
     HOST_FEE_DENOMINATOR,
-    CURVE_TYPE,
+    curveType,
+    curveParameters,
   );
 
   console.log('loading token swap');
@@ -213,7 +215,7 @@ export async function createTokenSwap(): Promise<void> {
   assert(
     HOST_FEE_DENOMINATOR == fetchedTokenSwap.hostFeeDenominator.toNumber(),
   );
-  assert(CURVE_TYPE == fetchedTokenSwap.curveType);
+  assert(curveType == fetchedTokenSwap.curveType);
 }
 
 export async function depositAllTokenTypes(): Promise<void> {
diff --git a/token-swap/js/src/index.ts b/token-swap/js/src/index.ts
index 6fba6f63..899c36a0 100644
--- a/token-swap/js/src/index.ts
+++ b/token-swap/js/src/index.ts
@@ -190,6 +190,7 @@ export class TokenSwap {
     hostFeeNumerator: number,
     hostFeeDenominator: number,
     curveType: number,
+    curveParameters: Numberu64 = new Numberu64(0),
   ): TransactionInstruction {
     const keys = [
       {pubkey: tokenSwapAccount.publicKey, isSigner: false, isWritable: true},
@@ -216,6 +217,13 @@ export class TokenSwap {
       BufferLayout.blob(32, 'curveParameters'),
     ]);
     let data = Buffer.alloc(1024);
+
+    // package curve parameters
+    // NOTE: currently assume all curves take a single parameter, u64 int
+    //       the remaining 24 of the 32 bytes available are filled with 0s
+    let curveParamsBuffer = Buffer.alloc(32);
+    curveParameters.toBuffer().copy(curveParamsBuffer);
+
     {
       const encodeLength = commandDataLayout.encode(
         {
@@ -230,6 +238,7 @@ export class TokenSwap {
           hostFeeNumerator,
           hostFeeDenominator,
           curveType,
+          curveParameters: curveParamsBuffer,
         },
         data,
       );
@@ -360,6 +369,7 @@ export class TokenSwap {
     hostFeeNumerator: number,
     hostFeeDenominator: number,
     curveType: number,
+    curveParameters?: Numberu64,
   ): Promise<TokenSwap> {
     let transaction;
     const tokenSwap = new TokenSwap(
@@ -421,6 +431,7 @@ export class TokenSwap {
       hostFeeNumerator,
       hostFeeDenominator,
       curveType,
+      curveParameters,
     );
 
     transaction.add(instruction);