diff --git a/docs/wallet-integration-guide/examples/scripts/06-merge-utxos.ts b/docs/wallet-integration-guide/examples/scripts/06-merge-utxos.ts
index 9ca87a591..008d5a70d 100644
--- a/docs/wallet-integration-guide/examples/scripts/06-merge-utxos.ts
+++ b/docs/wallet-integration-guide/examples/scripts/06-merge-utxos.ts
@@ -19,9 +19,27 @@ const amulet = await sdk.amulet(AMULET_NAMESPACE_CONFIG)
 
 const aliceKeys = sdk.keys.generate()
 
+const connectedSyncResponse = await sdk.ledger.state.connectedSynchronizers({})
+
+let synchronizerId
+
+if (
+    connectedSyncResponse.connectedSynchronizers &&
+    connectedSyncResponse.connectedSynchronizers.length > 0
+) {
+    logger.info(
+        `connected synchronizers: ${connectedSyncResponse.connectedSynchronizers.map((s) => s.synchronizerId).join(', ')}`
+    )
+    synchronizerId =
+        connectedSyncResponse.connectedSynchronizers[0].synchronizerId
+} else {
+    throw new Error('No connected synchronizers found')
+}
+
 const alice = await sdk.party.external
     .create(aliceKeys.publicKey, {
         partyHint: 'v1-06-alice',
+        ...(synchronizerId && { synchronizerId }),
     })
     .sign(aliceKeys.privateKey)
     .execute()
@@ -36,11 +54,14 @@ const tapPromises = tapIndices.map(async () => {
         '2000000'
     )
 
+    const synchronizerId = amuletTapDisclosedContracts[0]?.synchronizerId
+
     return sdk.ledger
         .prepare({
             partyId: alice.partyId,
             commands: amuletTapCommand,
             disclosedContracts: amuletTapDisclosedContracts,
+            ...(synchronizerId && { synchronizerId }),
         })
         .sign(aliceKeys.privateKey)
         .execute({ partyId: alice.partyId })
@@ -59,11 +80,14 @@ const [mergeUtxoCommands, mergedDisclosedContracts] = await token.utxos.merge({
 })
 
 const mergePromises = mergeUtxoCommands.map((mergeCommand) => {
+    const synchronizerId = mergedDisclosedContracts[0]?.synchronizerId
+
     return sdk.ledger
         .prepare({
             partyId: alice.partyId,
             commands: mergeCommand,
             disclosedContracts: mergedDisclosedContracts,
+            ...(synchronizerId && { synchronizerId }),
         })
         .sign(aliceKeys.privateKey)
         .execute({ partyId: alice.partyId })
diff --git a/scripts/src/start-localnet.ts b/scripts/src/start-localnet.ts
index e2b19d97b..e17fab7e6 100644
--- a/scripts/src/start-localnet.ts
+++ b/scripts/src/start-localnet.ts
@@ -55,8 +55,8 @@ const composeBase = [
     'app-provider',
     '--profile',
     'app-user',
-    // '--profile',
-    // 'multi-sync',
+    '--profile',
+    'multi-sync',
 ]
 
 const network = getNetworkArg()
diff --git a/sdk/wallet-sdk/src/wallet/namespace/ledger/client.ts b/sdk/wallet-sdk/src/wallet/namespace/ledger/client.ts
index 2484bbc36..0d5ee83a7 100644
--- a/sdk/wallet-sdk/src/wallet/namespace/ledger/client.ts
+++ b/sdk/wallet-sdk/src/wallet/namespace/ledger/client.ts
@@ -13,6 +13,7 @@ import { Dar } from './dar/client.js'
 import { AcsOptions } from '@canton-network/core-acs-reader'
 import { InternalPartySubmitterService } from './internal.js'
 import { PreparedTransactionService } from './hash/index.js'
+import { State } from '../state/index.js'
 
 type ListACSBody = {
     filter?: v3_4.components['schemas']['TransactionFilter']
@@ -22,10 +23,12 @@ export class Ledger {
     public readonly dar: Dar
     public readonly internal: InternalPartySubmitterService
     public readonly preparedTransaction: PreparedTransactionService
+    public readonly state: State
     constructor(private readonly sdkContext: CommonCtx) {
         this.dar = new Dar(sdkContext)
         this.internal = new InternalPartySubmitterService(sdkContext)
         this.preparedTransaction = new PreparedTransactionService(sdkContext)
+        this.state = new State(sdkContext)
     }
 
     public async ledgerEnd() {
diff --git a/sdk/wallet-sdk/src/wallet/namespace/party/external/signed.ts b/sdk/wallet-sdk/src/wallet/namespace/party/external/signed.ts
index 1893cef8c..d77fbe302 100644
--- a/sdk/wallet-sdk/src/wallet/namespace/party/external/signed.ts
+++ b/sdk/wallet-sdk/src/wallet/namespace/party/external/signed.ts
@@ -144,7 +144,9 @@ export class SignedPartyCreation {
         } = options
         const ledgerProvider = defaultLedgerProvider ?? this.ctx.ledgerProvider
         try {
-            const synchronizerId = this.ctx.defaultSynchronizerId
+            const synchronizerId =
+                this.createPartyOptions?.synchronizerId ??
+                this.ctx.defaultSynchronizerId
 
             await this.allocate(
                 ledgerProvider,
diff --git a/sdk/wallet-sdk/src/wallet/namespace/state/client.ts b/sdk/wallet-sdk/src/wallet/namespace/state/client.ts
new file mode 100644
index 000000000..06fb8824c
--- /dev/null
+++ b/sdk/wallet-sdk/src/wallet/namespace/state/client.ts
@@ -0,0 +1,57 @@
+// Copyright (c) 2025-2026 Digital Asset (Switzerland) GmbH and/or its affiliates. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { CommonCtx } from '../../sdk.js'
+import { Ops } from '@canton-network/core-provider-ledger'
+import { SDKLogger } from '../../logger/index.js'
+
+export type ConnectedSynchronizersOptions = {
+    party?: string
+    participantId?: string
+    identityProviderId?: string
+}
+
+export class State {
+    private readonly logger: SDKLogger
+
+    constructor(private readonly ctx: CommonCtx) {
+        this.logger = ctx.logger.child({ namespace: 'State' })
+    }
+
+    /**
+     * Returns the list of connected synchronizers for the given party / participant.
+     *
+     * Calls GET /v2/state/connected-synchronizers with optional query parameters.
+     *
+     * @param options - Optional filters: party, participantId, identityProviderId.
+     */
+    public async connectedSynchronizers(
+        options?: ConnectedSynchronizersOptions
+    ) {
+        this.logger.debug({ options }, 'Fetching connected synchronizers')
+
+        const result =
+            await this.ctx.ledgerProvider.request<Ops.GetV2StateConnectedSynchronizers>(
+                {
+                    method: 'ledgerApi',
+                    params: {
+                        resource: '/v2/state/connected-synchronizers',
+                        requestMethod: 'get',
+                        query: {
+                            ...(options?.party !== undefined && {
+                                party: options.party,
+                            }),
+                            ...(options?.participantId !== undefined && {
+                                participantId: options.participantId,
+                            }),
+                            ...(options?.identityProviderId !== undefined && {
+                                identityProviderId: options.identityProviderId,
+                            }),
+                        },
+                    },
+                }
+            )
+
+        return result
+    }
+}
diff --git a/sdk/wallet-sdk/src/wallet/namespace/state/index.ts b/sdk/wallet-sdk/src/wallet/namespace/state/index.ts
new file mode 100644
index 000000000..ccb7adf4e
--- /dev/null
+++ b/sdk/wallet-sdk/src/wallet/namespace/state/index.ts
@@ -0,0 +1,4 @@
+// Copyright (c) 2025-2026 Digital Asset (Switzerland) GmbH and/or its affiliates. All rights reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+export * from './client.js'