diff --git a/ts/client/src/accounts/bookSide.ts b/ts/client/src/accounts/bookSide.ts
index b3e2c125c..4f8ef7241 100644
--- a/ts/client/src/accounts/bookSide.ts
+++ b/ts/client/src/accounts/bookSide.ts
@@ -65,7 +65,7 @@ export class BookSide {
       return;
     }
     const stack = [this.rootFixed.maybeNode];
-    const [left, right] = this.side === SideUtils.Bid ? [1, 0] : [0, 1];
+    const [left, right] = this.side.bid ? [1, 0] : [0, 1];
 
     while (stack.length > 0) {
       const index = stack.pop()!;
@@ -94,7 +94,7 @@ export class BookSide {
       return;
     }
     const stack = [this.rootOraclePegged.maybeNode];
-    const [left, right] = this.side === SideUtils.Bid ? [1, 0] : [0, 1];
+    const [left, right] = this.side.bid ? [1, 0] : [0, 1];
 
     while (stack.length > 0) {
       const index = stack.pop()!;
@@ -122,7 +122,7 @@ export class BookSide {
   public compareOrders(a: Order, b: Order): boolean {
     return a.priceLots.eq(b.priceLots)
       ? a.seqNum.lt(b.seqNum) // if prices are equal prefer orders in the order they are placed
-      : this.side === SideUtils.Bid // else compare the actual prices
+      : this.side.bid // else compare the actual prices
       ? a.priceLots.gt(b.priceLots)
       : b.priceLots.gt(a.priceLots);
   }
diff --git a/ts/client/src/accounts/openOrders.ts b/ts/client/src/accounts/openOrders.ts
index 3b2816c6d..fca9412bd 100644
--- a/ts/client/src/accounts/openOrders.ts
+++ b/ts/client/src/accounts/openOrders.ts
@@ -160,7 +160,7 @@ export class OpenOrders {
   public async placeOrder(order: OrderToPlace): Promise<string> {
     // derive token account
     const mint =
-      order.side === SideUtils.Bid
+      order.side.bid
         ? this.market.account.quoteMint
         : this.market.account.baseMint;
     const userTokenAccount = await getAssociatedTokenAddress(
@@ -172,11 +172,11 @@ export class OpenOrders {
 
     const remainingAccounts = new Set<string>();
     const bookSide =
-      order.side === SideUtils.Bid ? this.market.asks : this.market.bids;
+      order.side.bid ? this.market.asks : this.market.bids;
     if (
       bookSide &&
-      order.orderType !== PlaceOrderTypeUtils.PostOnly &&
-      order.orderType !== PlaceOrderTypeUtils.PostOnlySlide
+      !order.orderType?.postOnly &&
+      !order.orderType?.postOnlySlide
     ) {
       for (const order of bookSide.items()) {
         remainingAccounts.add(order.leafNode.owner.toBase58());
@@ -411,11 +411,11 @@ export class OpenOrders {
       ? new BN(order.quoteLimit)
       : I64_MAX_BN;
     const clientOrderId = new BN(order.clientOrderId || Date.now());
-    const orderType = order.orderType || PlaceOrderTypeUtils.Limit;
-    const expiryTimestamp = new BN(order.expiryTimestamp || 0);
+    const orderType = order.orderType ?? PlaceOrderTypeUtils.Limit;
+    const expiryTimestamp = new BN(order.expiryTimestamp ?? 0);
     const selfTradeBehavior =
-      order.selfTradeBehavior || SelfTradeBehaviorUtils.DecrementTake;
-    const limit = order.matchLoopLimit || 16;
+      order.selfTradeBehavior ?? SelfTradeBehaviorUtils.DecrementTake;
+    const limit = order.matchLoopLimit ?? 16;
 
     const args = {
       side: order.side,
diff --git a/ts/client/src/client.ts b/ts/client/src/client.ts
index 3a6668a38..a70e4dfbb 100644
--- a/ts/client/src/client.ts
+++ b/ts/client/src/client.ts
@@ -567,7 +567,7 @@ export class OpenBookV2Client {
         userBaseAccount,
         userQuoteAccount,
         marketBaseVault: market.marketBaseVault,
-        marketQuoteVault: market.marketBaseVault,
+        marketQuoteVault: market.marketQuoteVault,
         tokenProgram: TOKEN_PROGRAM_ID,
       })
       .instruction();
@@ -589,7 +589,7 @@ export class OpenBookV2Client {
     openOrdersDelegate?: Keypair,
   ): Promise<[TransactionInstruction, Signer[]]> {
     const marketVault =
-      args.side === SideUtils.Bid
+      args.side.bid
         ? market.marketQuoteVault
         : market.marketBaseVault;
     const accountsMeta: AccountMeta[] = remainingAccounts.map((remaining) => ({
@@ -638,7 +638,7 @@ export class OpenBookV2Client {
     openOrdersDelegate?: Keypair,
   ): Promise<[TransactionInstruction, Signer[]]> {
     const marketVault =
-      args.side === SideUtils.Bid
+      args.side.bid
         ? market.marketQuoteVault
         : market.marketBaseVault;
     const accountsMeta: AccountMeta[] = remainingAccounts.map((remaining) => ({
diff --git a/ts/client/src/structs/order.ts b/ts/client/src/structs/order.ts
index 491e0aca4..459a3e3d0 100644
--- a/ts/client/src/structs/order.ts
+++ b/ts/client/src/structs/order.ts
@@ -13,7 +13,7 @@ export class Order {
     public isOraclePegged = false,
   ) {
     this.seqNum =
-      this.side === SideUtils.Bid
+      this.side.bid
         ? U64_MAX_BN.sub(this.leafNode.key.maskn(64))
         : this.leafNode.key.maskn(64);
     const priceData = this.leafNode.key.ushrn(64);
@@ -39,7 +39,7 @@ export class Order {
   }
 
   public toPrettyString(): string {
-    return `side:${this.side === SideUtils.Bid ? 'bid' : 'ask'} price:${
+    return `side:${this.side.bid ? 'bid' : 'ask'} price:${
       this.price
     } size:${this.size} seqNum:${this.seqNum.toString()} expired:${
       this.isExpired