diff --git a/ironfish/src/rpc/clients/client.ts b/ironfish/src/rpc/clients/client.ts
index 84bb664d48..4dcce51d15 100644
--- a/ironfish/src/rpc/clients/client.ts
+++ b/ironfish/src/rpc/clients/client.ts
@@ -172,6 +172,7 @@ import type {
   UseAccountResponse,
 } from '../routes'
 import { ApiNamespace } from '../routes/namespaces'
+import { AddSignatureRequest, AddSignatureResponse } from '../routes/wallet/addSignature'
 
 export abstract class RpcClient {
   abstract request<TEnd = unknown, TStream = unknown>(
@@ -555,6 +556,15 @@ export abstract class RpcClient {
       ).waitForEnd()
     },
 
+    addSignature: (
+      params: AddSignatureRequest,
+    ): Promise<RpcResponseEnded<AddSignatureResponse>> => {
+      return this.request<AddSignatureResponse>(
+        `${ApiNamespace.wallet}/addSignature`,
+        params,
+      ).waitForEnd()
+    },
+
     createTransaction: (
       params: CreateTransactionRequest,
     ): Promise<RpcResponseEnded<CreateTransactionResponse>> => {
diff --git a/ironfish/src/rpc/routes/wallet/__fixtures__/addSignature.test.ts.fixture b/ironfish/src/rpc/routes/wallet/__fixtures__/addSignature.test.ts.fixture
new file mode 100644
index 0000000000..47c40f17fa
--- /dev/null
+++ b/ironfish/src/rpc/routes/wallet/__fixtures__/addSignature.test.ts.fixture
@@ -0,0 +1,32 @@
+{
+  "Route wallet/addSignature should return error if signature is not a valid hex": [
+    {
+      "value": {
+        "version": 4,
+        "id": "0e9f1f07-ee9d-4746-a4e8-131d89d71345",
+        "name": "addSignatureAccount2",
+        "spendingKey": "21557df84c37fa55363c77ffe99a6d01a1c1938f06b805b34a2d2f3442016d3c",
+        "viewKey": "4d8f669c3667195906dcc4e636983d653e6042267fffb3b7ed1a00e8aeacf7011382ac8e43e6f446f3751dca9640eb7d684b88c181feec8f1399863b0e389c95",
+        "incomingViewKey": "9f13a57239aba9daade572166257ae494807e6436a9eaaf5bf312855e225d906",
+        "outgoingViewKey": "5c156963119e3fbdccd84d08622eae4dbbc36ada56e30682188a338fe9be0ed6",
+        "publicAddress": "608569ba934ef7bb6c6bc99e653b7ab18eb17bf02602c8fc489c3286d1065f2c",
+        "createdAt": {
+          "hash": {
+            "type": "Buffer",
+            "data": "base64:R5HXrp+X3xAO8VWOhHctagm0N2I4goP3XG8goyqIqoY="
+          },
+          "sequence": 1
+        },
+        "scanningEnabled": true,
+        "proofAuthorizingKey": "0b3bcdc835ee3709c9a30cad80c36d0d4f5d5712349d6bbfd34da9ed405bbc02"
+      },
+      "head": {
+        "hash": {
+          "type": "Buffer",
+          "data": "base64:R5HXrp+X3xAO8VWOhHctagm0N2I4goP3XG8goyqIqoY="
+        },
+        "sequence": 1
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/ironfish/src/rpc/routes/wallet/addSignature.test.ts b/ironfish/src/rpc/routes/wallet/addSignature.test.ts
new file mode 100644
index 0000000000..9d57c1ca49
--- /dev/null
+++ b/ironfish/src/rpc/routes/wallet/addSignature.test.ts
@@ -0,0 +1,36 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+import { RawTransactionSerde } from '../../../primitives'
+import { useAccountFixture } from '../../../testUtilities'
+import { createRawTransaction } from '../../../testUtilities/helpers/transaction'
+import { createRouteTest } from '../../../testUtilities/routeTest'
+
+describe('Route wallet/addSignature', () => {
+  const routeTest = createRouteTest(true)
+
+  it('should return error if signature is not a valid hex', async () => {
+    const account = await useAccountFixture(routeTest.node.wallet, 'addSignatureAccount')
+    const rawTransaction = await createRawTransaction({
+      wallet: routeTest.node.wallet,
+      from: account,
+    })
+
+    const response = await routeTest.client.wallet.buildTransaction({
+      rawTransaction: RawTransactionSerde.serialize(rawTransaction).toString('hex'),
+      account: account.name,
+    })
+
+    expect(response.status).toBe(200)
+    expect(response.content.unsignedTransaction).toBeDefined()
+
+    const invalidSignature = 'invalid'
+
+    await expect(
+      routeTest.client.wallet.addSignature({
+        unsignedTransaction: response.content.unsignedTransaction,
+        signature: invalidSignature,
+      }),
+    ).rejects.toThrow('Invalid signature length')
+  })
+})
diff --git a/ironfish/src/rpc/routes/wallet/addSignature.ts b/ironfish/src/rpc/routes/wallet/addSignature.ts
new file mode 100644
index 0000000000..122712f97a
--- /dev/null
+++ b/ironfish/src/rpc/routes/wallet/addSignature.ts
@@ -0,0 +1,53 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+import { UnsignedTransaction } from '@ironfish/rust-nodejs'
+import * as yup from 'yup'
+import { ApiNamespace } from '../namespaces'
+import { routes } from '../router'
+import { AssertHasRpcContext } from '../rpcContext'
+
+export type AddSignatureRequest = {
+  unsignedTransaction: string
+  signature: string
+}
+
+export type AddSignatureResponse = {
+  transaction: string
+}
+
+export const AddSignatureRequestSchema: yup.ObjectSchema<AddSignatureRequest> = yup
+  .object({
+    unsignedTransaction: yup.string().defined(),
+    signature: yup.string().defined(),
+  })
+  .defined()
+
+export const AddSignatureResponseSchema: yup.ObjectSchema<AddSignatureResponse> = yup
+  .object({
+    transaction: yup.string().defined(),
+  })
+  .defined()
+
+routes.register<typeof AddSignatureRequestSchema, AddSignatureResponse>(
+  `${ApiNamespace.wallet}/addSignature`,
+  AddSignatureRequestSchema,
+  (request, node): void => {
+    AssertHasRpcContext(request, node, 'wallet')
+    const unsignedTransaction = new UnsignedTransaction(
+      Buffer.from(request.data.unsignedTransaction, 'hex'),
+    )
+
+    const buffer = Buffer.from(request.data.signature, 'hex')
+
+    if (buffer.length !== 64) {
+      throw new Error('Invalid signature length')
+    }
+
+    const serialized = unsignedTransaction.addSignature(buffer)
+
+    request.end({
+      transaction: serialized.toString('hex'),
+    })
+  },
+)
diff --git a/ironfish/src/rpc/routes/wallet/index.ts b/ironfish/src/rpc/routes/wallet/index.ts
index 446008ccb1..742c56b7a2 100644
--- a/ironfish/src/rpc/routes/wallet/index.ts
+++ b/ironfish/src/rpc/routes/wallet/index.ts
@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-export * from './setAccountHead'
+export * from './addSignature'
 export * from './addTransaction'
 export * from './buildTransaction'
 export * from './burnAsset'
@@ -12,10 +12,10 @@ export * from './createTransaction'
 export * from './estimateFeeRates'
 export * from './exportAccount'
 export * from './getAccountNotesStream'
-export * from './getAccounts'
 export * from './getAccountStatus'
 export * from './getAccountTransaction'
 export * from './getAccountTransactions'
+export * from './getAccounts'
 export * from './getAccountsStatus'
 export * from './getAsset'
 export * from './getAssets'
@@ -38,6 +38,7 @@ export * from './renameAccount'
 export * from './rescan'
 export * from './resetAccount'
 export * from './sendTransaction'
+export * from './setAccountHead'
 export * from './setScanning'
 export * from './types'
 export * from './use'