diff --git a/app/src/app/listing/[pk]/page.tsx b/app/src/app/listing/[pk]/page.tsx
index 114a496..a42b229 100644
--- a/app/src/app/listing/[pk]/page.tsx
+++ b/app/src/app/listing/[pk]/page.tsx
@@ -6,6 +6,7 @@ import { useWallet, useKitTransactionSigner } from '@solana/connector/react'
 import { ListingDetail } from '@/components/ListingDetail'
 import { useTx } from '@/hooks/useTx'
 import { useListing } from '@/hooks/useListing'
+import { useResolvers } from '@/hooks/useResolvers'
 import {
   getCloseListingInstruction,
   getCreateOrderInstructionAsync,
@@ -13,6 +14,8 @@ import {
   deriveEscrowId,
 } from '@solisting/sdk'
 import { DESCRO_PROGRAM_ADDRESS } from '@descro/sdk'
+import { ResolverType } from '@descro/sdk'
+import { Button } from '@/components/ui/Button'
 import type { Address } from '@solisting/sdk'
 
 const SYSTEM_PROGRAM = '11111111111111111111111111111111' as Address<'11111111111111111111111111111111'>
@@ -24,7 +27,10 @@ export default function ListingPage({ params }: { params: Promise<{ pk: string }
   const { signer } = useKitTransactionSigner()
   const sendTx = useTx()
   const { data: listing } = useListing(pk as Address)
+  const { data: resolvers = [] } = useResolvers()
   const [orderLoading, setOrderLoading] = useState(false)
+  const [showResolverPicker, setShowResolverPicker] = useState(false)
+  const [selectedResolver, setSelectedResolver] = useState<Address | null>(null)
 
   async function handleClose() {
     if (!signer) return
@@ -33,8 +39,14 @@ export default function ListingPage({ params }: { params: Promise<{ pk: string }
     router.push('/listings')
   }
 
-  async function handlePlaceOrder() {
+  function openPlaceOrder() {
+    setSelectedResolver(null)
+    setShowResolverPicker(true)
+  }
+
+  async function handleConfirmOrder() {
     if (!signer || !account || !listing) return
+    setShowResolverPicker(false)
     setOrderLoading(true)
     try {
       const orderId = BigInt(Date.now())
@@ -50,7 +62,7 @@ export default function ListingPage({ params }: { params: Promise<{ pk: string }
         descroProgram: DESCRO_PROGRAM_ADDRESS,
         orderId,
         escrowId,
-        resolver: account as Address,
+        resolver: selectedResolver,
         paymentCurrency: { __kind: 'Sol' },
         expectedAmount: listing.data.price,
         maxSlippageBps: 0,
@@ -67,13 +79,101 @@ export default function ListingPage({ params }: { params: Promise<{ pk: string }
     }
   }
 
+  const acceptedResolvers = listing?.data.acceptedResolvers ?? []
+  const visibleResolvers = acceptedResolvers.length > 0
+    ? resolvers.filter((r) => acceptedResolvers.includes(r.pda as Address))
+    : resolvers
+  const mustSelectResolver = acceptedResolvers.length > 0
+  const confirmDisabled = mustSelectResolver && !selectedResolver
+
   return (
-    <ListingDetail
-      pk={pk as Address}
-      walletAddress={account ?? null}
-      onUpdate={() => router.push(`/listing/create?edit=${pk}`)}
-      onClose={handleClose}
-      onPlaceOrder={orderLoading ? undefined : handlePlaceOrder}
-    />
+    <>
+      <ListingDetail
+        pk={pk as Address}
+        walletAddress={account ?? null}
+        onUpdate={() => router.push(`/listing/create?edit=${pk}`)}
+        onClose={handleClose}
+        onPlaceOrder={orderLoading ? undefined : openPlaceOrder}
+      />
+
+      {showResolverPicker && (
+        <div
+          style={{ position: 'fixed', inset: 0, background: 'rgba(0,0,0,.55)', display: 'flex', alignItems: 'center', justifyContent: 'center', zIndex: 100 }}
+          onClick={(e) => { if (e.target === e.currentTarget) setShowResolverPicker(false) }}
+        >
+          <div style={{ background: 'var(--bg)', border: '1px solid var(--bd)', borderRadius: 'var(--radius)', padding: '28px 28px 24px', width: 440, maxWidth: '90vw', maxHeight: '80vh', overflow: 'auto' }}>
+            <div style={{ fontSize: 11, fontWeight: 600, letterSpacing: '.14em', color: 'var(--mut)', marginBottom: 12 }}>PLACE ORDER</div>
+            <h2 style={{ margin: '0 0 8px', fontSize: 19, fontWeight: 700 }}>Select Resolver</h2>
+            <p style={{ margin: '0 0 20px', fontSize: 13, color: 'var(--mut)', lineHeight: 1.55 }}>
+              {mustSelectResolver
+                ? 'This listing requires one of the following resolvers for dispute resolution.'
+                : 'Choose a resolver for dispute resolution, or proceed without one.'}
+            </p>
+
+            <div style={{ display: 'flex', flexDirection: 'column', gap: 8, marginBottom: 22 }}>
+              {!mustSelectResolver && (
+                <ResolverOption
+                  selected={selectedResolver === null}
+                  onClick={() => setSelectedResolver(null)}
+                  label="No resolver"
+                  sublabel="Disputes cannot be resolved on-chain"
+                />
+              )}
+              {visibleResolvers.map((r) => (
+                <ResolverOption
+                  key={r.pda}
+                  selected={selectedResolver === r.pda}
+                  onClick={() => setSelectedResolver(r.pda as Address)}
+                  label={`${r.pda.slice(0, 8)}…${r.pda.slice(-6)}`}
+                  sublabel={ResolverType[r.data.resolverType as number] as string}
+                  mono
+                />
+              ))}
+              {visibleResolvers.length === 0 && mustSelectResolver && (
+                <div style={{ fontSize: 13, color: 'var(--mut)', padding: '12px 0' }}>
+                  No registered resolvers found for this listing.
+                </div>
+              )}
+            </div>
+
+            <div style={{ display: 'flex', gap: 10, justifyContent: 'flex-end' }}>
+              <Button variant="ghost" onClick={() => setShowResolverPicker(false)}>Cancel</Button>
+              <Button onClick={handleConfirmOrder} disabled={confirmDisabled}>Place Order</Button>
+            </div>
+          </div>
+        </div>
+      )}
+    </>
+  )
+}
+
+function ResolverOption({ selected, onClick, label, sublabel, mono }: {
+  selected: boolean
+  onClick: () => void
+  label: string
+  sublabel?: string
+  mono?: boolean
+}) {
+  return (
+    <button
+      onClick={onClick}
+      style={{
+        display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: 12,
+        padding: '11px 14px', borderRadius: 9, cursor: 'pointer', textAlign: 'left',
+        background: selected ? 'var(--accSoft)' : 'var(--bg3)',
+        border: `1px solid ${selected ? 'var(--accBd)' : 'var(--bd)'}`,
+        color: 'var(--tx)',
+        transition: 'background .12s, border-color .12s',
+      }}
+    >
+      <span style={{ fontFamily: mono ? 'var(--font-mono)' : undefined, fontSize: mono ? 12.5 : 13, fontWeight: selected ? 600 : mono ? 400 : 600 }}>
+        {label}
+      </span>
+      {sublabel && (
+        <span style={{ fontSize: 11.5, color: 'var(--mut)', flexShrink: 0 }}>
+          {sublabel}
+        </span>
+      )}
+    </button>
   )
 }
diff --git a/programs/solisting/src/instructions/create_order.rs b/programs/solisting/src/instructions/create_order.rs
index 61acaad..16e9a2b 100644
--- a/programs/solisting/src/instructions/create_order.rs
+++ b/programs/solisting/src/instructions/create_order.rs
@@ -4,7 +4,7 @@ use crate::state::{Currency, ListingAccount, OrderAccount};
 use anchor_lang::prelude::*;
 
 #[derive(Accounts)]
-#[instruction(order_id: u64, escrow_id: u64, resolver: Pubkey, payment_currency: Currency)]
+#[instruction(order_id: u64, escrow_id: u64, resolver: Option<Pubkey>, payment_currency: Currency)]
 pub struct CreateOrder<'info> {
     #[account(mut)]
     pub buyer: Signer<'info>,
@@ -67,7 +67,7 @@ pub fn handler(
     ctx: Context<CreateOrder>,
     order_id: u64,
     escrow_id: u64,
-    resolver: Pubkey,
+    resolver: Option<Pubkey>,
     payment_currency: Currency,
     expected_amount: u64,
     max_slippage_bps: u16,
@@ -80,10 +80,13 @@ pub fn handler(
     let listing = &ctx.accounts.listing_account;
 
     if !listing.accepted_resolvers.is_empty() {
-        require!(
-            listing.accepted_resolvers.contains(&resolver),
-            SolistingError::ResolverNotAccepted
-        );
+        match resolver {
+            Some(r) => require!(
+                listing.accepted_resolvers.contains(&r),
+                SolistingError::ResolverNotAccepted
+            ),
+            None => return err!(SolistingError::ResolverNotAccepted),
+        }
     }
 
     let amount = if payment_currency == listing.canonical_currency {
@@ -143,7 +146,7 @@ pub fn handler(
             },
         ),
         amount,
-        Some(resolver),
+        resolver,
         escrow_id,
     )?;
 
diff --git a/programs/solisting/src/lib.rs b/programs/solisting/src/lib.rs
index 17de565..45863e3 100644
--- a/programs/solisting/src/lib.rs
+++ b/programs/solisting/src/lib.rs
@@ -70,7 +70,7 @@ pub mod solisting {
         ctx: Context<CreateOrder>,
         order_id: u64,
         escrow_id: u64,
-        resolver: Pubkey,
+        resolver: Option<Pubkey>,
         payment_currency: state::Currency,
         expected_amount: u64,
         max_slippage_bps: u16,
diff --git a/programs/solisting/src/state.rs b/programs/solisting/src/state.rs
index 47b90af..d7f111e 100644
--- a/programs/solisting/src/state.rs
+++ b/programs/solisting/src/state.rs
@@ -69,7 +69,7 @@ pub struct OrderAccount {
     pub listing: Pubkey,
     pub buyer: Pubkey,
     pub seller: Pubkey,
-    pub resolver: Pubkey,
+    pub resolver: Option<Pubkey>,
     /// The currency the buyer chose to pay in.
     pub payment_currency: Currency,
     /// Actual amount paid (may differ from price when oracle-converted).
diff --git a/programs/solisting/tests/common/mod.rs b/programs/solisting/tests/common/mod.rs
index 4c4872b..ed8ffd5 100644
--- a/programs/solisting/tests/common/mod.rs
+++ b/programs/solisting/tests/common/mod.rs
@@ -195,7 +195,6 @@ pub fn ix_create_order(
     canonical_oracle: Option<Pubkey>,
     target_oracle: Option<Pubkey>,
 ) -> Instruction {
-    let resolver = Pubkey::new_unique();
     ix_create_order_with_resolver(
         buyer,
         seller,
@@ -205,7 +204,7 @@ pub fn ix_create_order(
         max_slippage_bps,
         canonical_oracle,
         target_oracle,
-        resolver,
+        Some(Pubkey::new_unique()),
     )
 }
 
@@ -219,7 +218,7 @@ pub fn ix_create_order_with_resolver(
     max_slippage_bps: u16,
     canonical_oracle: Option<Pubkey>,
     target_oracle: Option<Pubkey>,
-    resolver: Pubkey,
+    resolver: Option<Pubkey>,
 ) -> Instruction {
     let listing = listing_pda(seller, listing_id);
     let order = order_pda(listing, *buyer, order_id);
@@ -264,7 +263,7 @@ pub fn ix_accept_order(
     buyer: &Pubkey,
     order_id: u64,
     escrow_id: u64,
-    resolver: Pubkey,
+    resolver: Option<Pubkey>,
 ) -> Instruction {
     let listing_account = listing_pda(seller, listing_id);
     let order_account = order_pda(listing_account, *buyer, order_id);
@@ -276,7 +275,7 @@ pub fn ix_accept_order(
         &solisting::instruction::AcceptOrder {}.data(),
         solisting::accounts::AcceptOrder {
             seller: *seller,
-            resolver,
+            resolver: resolver.unwrap_or(system_program::ID),
             listing_account,
             order_account,
             escrow_account,
diff --git a/programs/solisting/tests/test_orders.rs b/programs/solisting/tests/test_orders.rs
index d2c6624..d9cf652 100644
--- a/programs/solisting/tests/test_orders.rs
+++ b/programs/solisting/tests/test_orders.rs
@@ -118,7 +118,7 @@ fn create_order_fails_if_resolver_not_accepted() {
         &mut svm,
         &[ix_create_order_with_resolver(
             &buyer.pubkey(), &seller.pubkey(), listing_id, 1,
-            Currency::Sol, 0, None, None, Pubkey::new_unique(),
+            Currency::Sol, 0, None, None, Some(Pubkey::new_unique()),
         )],
         &[&buyer],
     );
@@ -152,7 +152,7 @@ fn seller_accept_creates_active_descro_escrow() {
     );
 
     let order_key = order_pda(listing_key, buyer.pubkey(), order_id);
-    assert!(svm.get_account(&order_key).is_none());
+    assert!(svm.get_account(&order_key).is_some());
 
     let listing = read_listing(&svm, &seller.pubkey(), listing_id);
     assert_eq!(listing.quantity_reserved, 0);
diff --git a/sdk/src/generated/solisting/src/generated/accounts/solistingStateOrderAccount.ts b/sdk/src/generated/solisting/src/generated/accounts/solistingStateOrderAccount.ts
index 33bb7fc..ad24cb2 100644
--- a/sdk/src/generated/solisting/src/generated/accounts/solistingStateOrderAccount.ts
+++ b/sdk/src/generated/solisting/src/generated/accounts/solistingStateOrderAccount.ts
@@ -21,6 +21,8 @@ import {
   getBytesEncoder,
   getI64Decoder,
   getI64Encoder,
+  getOptionDecoder,
+  getOptionEncoder,
   getStructDecoder,
   getStructEncoder,
   getU64Decoder,
@@ -38,6 +40,8 @@ import {
   type FetchAccountsConfig,
   type MaybeAccount,
   type MaybeEncodedAccount,
+  type Option,
+  type OptionOrNullable,
   type ReadonlyUint8Array,
 } from "@solana/kit";
 import {
@@ -61,7 +65,7 @@ export type SolistingStateOrderAccount = {
   listing: Address;
   buyer: Address;
   seller: Address;
-  resolver: Address;
+  resolver: Option<Address>;
   /** The currency the buyer chose to pay in. */
   paymentCurrency: SolistingStateCurrency;
   /** Actual amount paid (may differ from price when oracle-converted). */
@@ -79,7 +83,7 @@ export type SolistingStateOrderAccountArgs = {
   listing: Address;
   buyer: Address;
   seller: Address;
-  resolver: Address;
+  resolver: OptionOrNullable<Address>;
   /** The currency the buyer chose to pay in. */
   paymentCurrency: SolistingStateCurrencyArgs;
   /** Actual amount paid (may differ from price when oracle-converted). */
@@ -101,7 +105,7 @@ export function getSolistingStateOrderAccountEncoder(): Encoder<SolistingStateOr
       ["listing", getAddressEncoder()],
       ["buyer", getAddressEncoder()],
       ["seller", getAddressEncoder()],
-      ["resolver", getAddressEncoder()],
+      ["resolver", getOptionEncoder(getAddressEncoder())],
       ["paymentCurrency", getSolistingStateCurrencyEncoder()],
       ["amount", getU64Encoder()],
       ["escrowAccount", getAddressEncoder()],
@@ -124,7 +128,7 @@ export function getSolistingStateOrderAccountDecoder(): Decoder<SolistingStateOr
     ["listing", getAddressDecoder()],
     ["buyer", getAddressDecoder()],
     ["seller", getAddressDecoder()],
-    ["resolver", getAddressDecoder()],
+    ["resolver", getOptionDecoder(getAddressDecoder())],
     ["paymentCurrency", getSolistingStateCurrencyDecoder()],
     ["amount", getU64Decoder()],
     ["escrowAccount", getAddressDecoder()],
diff --git a/sdk/src/generated/solisting/src/generated/instructions/createOrder.ts b/sdk/src/generated/solisting/src/generated/instructions/createOrder.ts
index 26b7b6b..9e3bebe 100644
--- a/sdk/src/generated/solisting/src/generated/instructions/createOrder.ts
+++ b/sdk/src/generated/solisting/src/generated/instructions/createOrder.ts
@@ -14,6 +14,8 @@ import {
   getAddressEncoder,
   getBytesDecoder,
   getBytesEncoder,
+  getOptionDecoder,
+  getOptionEncoder,
   getProgramDerivedAddress,
   getStructDecoder,
   getStructEncoder,
@@ -33,6 +35,8 @@ import {
   type Instruction,
   type InstructionWithAccounts,
   type InstructionWithData,
+  type Option,
+  type OptionOrNullable,
   type ReadonlyAccount,
   type ReadonlyUint8Array,
   type TransactionSigner,
@@ -121,7 +125,7 @@ export type CreateOrderInstructionData = {
   discriminator: ReadonlyUint8Array;
   orderId: bigint;
   escrowId: bigint;
-  resolver: Address;
+  resolver: Option<Address>;
   paymentCurrency: SolistingStateCurrency;
   expectedAmount: bigint;
   maxSlippageBps: number;
@@ -130,7 +134,7 @@ export type CreateOrderInstructionData = {
 export type CreateOrderInstructionDataArgs = {
   orderId: number | bigint;
   escrowId: number | bigint;
-  resolver: Address;
+  resolver: OptionOrNullable<Address>;
   paymentCurrency: SolistingStateCurrencyArgs;
   expectedAmount: number | bigint;
   maxSlippageBps: number;
@@ -142,7 +146,7 @@ export function getCreateOrderInstructionDataEncoder(): Encoder<CreateOrderInstr
       ["discriminator", fixEncoderSize(getBytesEncoder(), 8)],
       ["orderId", getU64Encoder()],
       ["escrowId", getU64Encoder()],
-      ["resolver", getAddressEncoder()],
+      ["resolver", getOptionEncoder(getAddressEncoder())],
       ["paymentCurrency", getSolistingStateCurrencyEncoder()],
       ["expectedAmount", getU64Encoder()],
       ["maxSlippageBps", getU16Encoder()],
@@ -156,7 +160,7 @@ export function getCreateOrderInstructionDataDecoder(): Decoder<CreateOrderInstr
     ["discriminator", fixDecoderSize(getBytesDecoder(), 8)],
     ["orderId", getU64Decoder()],
     ["escrowId", getU64Decoder()],
-    ["resolver", getAddressDecoder()],
+    ["resolver", getOptionDecoder(getAddressDecoder())],
     ["paymentCurrency", getSolistingStateCurrencyDecoder()],
     ["expectedAmount", getU64Decoder()],
     ["maxSlippageBps", getU16Decoder()],
diff --git a/sdk/src/order.ts b/sdk/src/order.ts
index 4cf4fb9..27bbd83 100644
--- a/sdk/src/order.ts
+++ b/sdk/src/order.ts
@@ -21,15 +21,15 @@ type GetRpc = Rpc<GetAccountInfoApi>
 //   8: listing       (32)
 //  40: buyer         (32)
 //  72: seller        (32)
-// 104: resolver      (32)
-// 136: paymentCurrency — Sol variant = 1 byte tag + 0 data = 1 byte total
-// 137: amount        (8)
-// 145: escrowAccount (32)
+// 104: resolver      Option<Pubkey> = 1 byte tag + 32 bytes = 33 bytes
+// 137: paymentCurrency — Sol variant = 1 byte tag + 0 data = 1 byte total
+// 138: amount        (8)
+// 146: escrowAccount (32)
 const LISTING_OFFSET = 8n
 const BUYER_OFFSET = 40n
 // escrowAccount offset is only valid for Sol-currency orders.
-// SPL orders (currently rejected by the program with SplNotImplemented) would sit at offset 178.
-const ESCROW_ACCOUNT_OFFSET = 145n
+// SPL orders (currently rejected by the program with SplNotImplemented) would sit at offset 179.
+const ESCROW_ACCOUNT_OFFSET = 146n
 
 type RawGpaResult = Array<{
   pubkey: Address
diff --git a/target/idl/solisting.json b/target/idl/solisting.json
index 4db8d51..1cca1c1 100644
--- a/target/idl/solisting.json
+++ b/target/idl/solisting.json
@@ -835,7 +835,9 @@
         },
         {
           "name": "resolver",
-          "type": "pubkey"
+          "type": {
+            "option": "pubkey"
+          }
         },
         {
           "name": "payment_currency",
@@ -1461,7 +1463,9 @@
           },
           {
             "name": "resolver",
-            "type": "pubkey"
+            "type": {
+              "option": "pubkey"
+            }
           },
           {
             "name": "payment_currency",