diff --git a/examples/browser/aepp/src/App.vue b/examples/browser/aepp/src/App.vue
index e47c10e676..4ae4c33121 100644
--- a/examples/browser/aepp/src/App.vue
+++ b/examples/browser/aepp/src/App.vue
@@ -18,6 +18,13 @@
     >
       Smart contracts
     </a>
+    <a
+      href="#"
+      :class="{ active: view === 'PayForTx' }"
+      @click="view = 'PayForTx'"
+    >
+      Pay for transaction
+    </a>
   </div>
 
   <Component
@@ -31,9 +38,12 @@ import { mapState } from 'vuex';
 import Connect from './Connect.vue';
 import Basic from './Basic.vue';
 import Contracts from './Contracts.vue';
+import PayForTx from './PayForTx.vue';
 
 export default {
-  components: { Connect, Basic, Contracts },
+  components: {
+    Connect, Basic, Contracts, PayForTx,
+  },
   data: () => ({ view: '' }),
   computed: mapState(['aeSdk']),
 };
diff --git a/examples/browser/aepp/src/PayForTx.vue b/examples/browser/aepp/src/PayForTx.vue
new file mode 100644
index 0000000000..4167ab7b8e
--- /dev/null
+++ b/examples/browser/aepp/src/PayForTx.vue
@@ -0,0 +1,72 @@
+<template>
+  <GenerateSpendTx />
+
+  <h2>Sign inner transaction</h2>
+  <div class="group">
+    <div>
+      <div>Transaction</div>
+      <div>
+        <input
+          v-model="txToPayFor"
+          placeholder="tx_..."
+        >
+      </div>
+    </div>
+    <button @click="signInnerTxPromise = signInnerTx()">
+      Sign
+    </button>
+    <div v-if="signInnerTxPromise">
+      <div>Signed inner transaction</div>
+      <Value :value="signInnerTxPromise" />
+    </div>
+  </div>
+
+  <h2>Pay for transaction</h2>
+  <div class="group">
+    <div>
+      <div>Signed inner transaction</div>
+      <div>
+        <input
+          v-model="innerTx"
+          placeholder="tx_..."
+        >
+      </div>
+    </div>
+    <button @click="payForTxPromise = payForTx()">
+      Pay for transaction
+    </button>
+    <div v-if="payForTxPromise">
+      <div>Result</div>
+      <Value :value="payForTxPromise" />
+    </div>
+  </div>
+</template>
+
+<script>
+import { mapState } from 'vuex';
+import Value from './components/Value.vue';
+import SpendCoins from './components/SpendCoins.vue';
+import MessageSign from './components/MessageSign.vue';
+import GenerateSpendTx from './components/GenerateSpendTx.vue';
+
+export default {
+  components: {
+    Value, SpendCoins, MessageSign, GenerateSpendTx,
+  },
+  data: () => ({
+    innerTx: '',
+    txToPayFor: '',
+    signInnerTxPromise: null,
+    payForTxPromise: null,
+  }),
+  computed: mapState(['aeSdk']),
+  methods: {
+    signInnerTx() {
+      return this.aeSdk.signTransaction(this.txToPayFor, { innerTx: true });
+    },
+    payForTx() {
+      return this.aeSdk.payForTransaction(this.innerTx);
+    },
+  },
+};
+</script>
diff --git a/examples/browser/aepp/src/components/GenerateSpendTx.vue b/examples/browser/aepp/src/components/GenerateSpendTx.vue
new file mode 100644
index 0000000000..c9d9496863
--- /dev/null
+++ b/examples/browser/aepp/src/components/GenerateSpendTx.vue
@@ -0,0 +1,76 @@
+<template>
+  <h2>Generate spend transaction</h2>
+  <div class="group">
+    <div>
+      <div>Recipient address</div>
+      <div>
+        <input
+          v-model="spendTo"
+          placeholder="ak_..."
+        >
+      </div>
+    </div>
+    <div>
+      <div>Coins amount</div>
+      <div><input v-model="spendAmount"></div>
+    </div>
+    <div>
+      <div>Payload</div>
+      <div><input v-model="spendPayload"></div>
+    </div>
+    <div>
+      <div>Increment nonce by 1</div>
+      <div>
+        <input
+          type="checkbox"
+          v-model="incrementNonce"
+        >
+        (only if you want to pay for this transaction yourself)
+      </div>
+    </div>
+    <button @click="generatePromise = generate()">
+      Generate
+    </button>
+    <div v-if="generatePromise">
+      <div>Spend transaction</div>
+      <Value :value="generatePromise" />
+    </div>
+  </div>
+</template>
+
+<script>
+import { mapState } from 'vuex';
+import {
+  encode, Encoding, Tag, unpackTx, buildTx,
+} from '@aeternity/aepp-sdk';
+import Value from './Value.vue';
+
+export default {
+  components: { Value },
+  data: () => ({
+    spendTo: '',
+    spendAmount: '',
+    spendPayload: '',
+    incrementNonce: true,
+    generatePromise: null,
+  }),
+  computed: mapState(['aeSdk']),
+  methods: {
+    async generate() {
+      let spendTx = await this.aeSdk.buildTx({
+        tag: Tag.SpendTx,
+        senderId: this.aeSdk.address,
+        recipientId: this.spendTo,
+        amount: this.spendAmount,
+        payload: encode(new TextEncoder().encode(this.spendPayload), Encoding.Bytearray),
+      });
+      if (this.incrementNonce) {
+        const spendTxParams = unpackTx(spendTx);
+        spendTxParams.nonce += 1;
+        spendTx = buildTx(spendTxParams);
+      }
+      return spendTx;
+    },
+  },
+};
+</script>
diff --git a/examples/browser/aepp/src/styles.scss b/examples/browser/aepp/src/styles.scss
index 77f45e94c3..1ea40925ba 100644
--- a/examples/browser/aepp/src/styles.scss
+++ b/examples/browser/aepp/src/styles.scss
@@ -30,7 +30,7 @@ h2 {
   @extend .mt-2, .font-bold, .text-2xl;
 }
 
-input:not([type=radio]), textarea {
+input:not([type=radio]):not([type=checkbox]), textarea {
   @extend .bg-gray-900, .text-white, .p-2, .w-full;
 }
 
diff --git a/src/AeSdkWallet.ts b/src/AeSdkWallet.ts
index 75ea3f4c16..fb452309d5 100644
--- a/src/AeSdkWallet.ts
+++ b/src/AeSdkWallet.ts
@@ -243,14 +243,21 @@ export default class AeSdkWallet extends AeSdk {
             await this.onAskAccounts(id, params, origin);
             return this.addresses();
           },
-          [METHODS.sign]: async ({ tx, onAccount = this.address, returnSigned }, origin) => {
+          [METHODS.sign]: async (
+            {
+              tx, onAccount = this.address, returnSigned, innerTx,
+            },
+            origin,
+          ) => {
             if (!this._isRpcClientConnected(id)) throw new RpcNotAuthorizeError();
             if (!this.addresses().includes(onAccount)) {
               throw new RpcPermissionDenyError(onAccount);
             }
 
-            const parameters = { onAccount, aeppOrigin: origin, aeppRpcClientId: id };
-            if (returnSigned) {
+            const parameters = {
+              onAccount, aeppOrigin: origin, aeppRpcClientId: id, innerTx,
+            };
+            if (returnSigned || innerTx === true) {
               return { signedTransaction: await this.signTransaction(tx, parameters) };
             }
             try {
diff --git a/src/account/Rpc.ts b/src/account/Rpc.ts
index c808cb3da8..b4fbbaf6ed 100644
--- a/src/account/Rpc.ts
+++ b/src/account/Rpc.ts
@@ -35,13 +35,13 @@ export default class AccountRpc extends AccountBase {
     tx: Encoded.Transaction,
     { innerTx, networkId }: Parameters<AccountBase['signTransaction']>[1] = {},
   ): Promise<Encoded.Transaction> {
-    if (innerTx != null) throw new NotImplementedError('innerTx option in AccountRpc');
     if (networkId == null) throw new ArgumentError('networkId', 'provided', networkId);
     const res = await this._rpcClient.request(METHODS.sign, {
       onAccount: this.address,
       tx,
       returnSigned: true,
       networkId,
+      innerTx,
     });
     if (res.signedTransaction == null) {
       throw new UnsupportedProtocolError('signedTransaction is missed in wallet response');
diff --git a/src/aepp-wallet-communication/rpc/types.ts b/src/aepp-wallet-communication/rpc/types.ts
index 1aad2fb343..c7f4ad7015 100644
--- a/src/aepp-wallet-communication/rpc/types.ts
+++ b/src/aepp-wallet-communication/rpc/types.ts
@@ -55,6 +55,7 @@ export interface WalletApi {
        * @see {@link https://github.com/aeternity/aepp-sdk-js/commit/153fd89a52c4eab39fcd659b356b36d32129c1ba}
        */
       networkId: string;
+      innerTx?: boolean;
     }
   ) => Promise<{
     /**
diff --git a/src/tx/validator.ts b/src/tx/validator.ts
index 87057152b3..ca17dc8056 100644
--- a/src/tx/validator.ts
+++ b/src/tx/validator.ts
@@ -144,6 +144,7 @@ validators.push(
     return [{ message, key: 'InvalidAccountType', checkedKeys: ['tag'] }];
   },
   // TODO: revert nonce check
+  // TODO: ensure nonce valid when paying for own tx
   (tx, { consensusProtocolVersion }) => {
     const oracleCall = Tag.Oracle === tx.tag || Tag.OracleRegisterTx === tx.tag;
     const contractCreate = Tag.ContractCreateTx === tx.tag || Tag.GaAttachTx === tx.tag;
diff --git a/test/integration/rpc.ts b/test/integration/rpc.ts
index 29870d2a4d..cc7ee8af36 100644
--- a/test/integration/rpc.ts
+++ b/test/integration/rpc.ts
@@ -21,7 +21,6 @@ import {
   METHODS,
   RPC_STATUS,
   generateKeyPair,
-  hash,
   verify,
   NoWalletConnectedError,
   UnAuthorizedAccountError,
@@ -32,7 +31,7 @@ import {
   verifyMessage,
   buildTx,
 } from '../../src';
-import { concatBuffers } from '../../src/utils/other';
+import { getBufferToSign } from '../../src/account/Memory';
 import { ImplPostMessage } from '../../src/aepp-wallet-communication/connection/BrowserWindowMessage';
 import {
   getSdk, ignoreVersion, networkId, url, compilerUrl,
@@ -300,23 +299,23 @@ describe('Aepp<->Wallet', function aeppWallet() {
         .to.be.rejectedWith('The peer failed to execute your request due to unknown error');
     });
 
-    it('Sign transaction: wallet allow', async () => {
-      // @ts-expect-error removes object property to restore the original behavior
-      delete wallet._resolveAccount().signTransaction;
-      const tx = await aepp.buildTx({
-        tag: Tag.SpendTx,
-        senderId: aepp.address,
-        recipientId: aepp.address,
-        amount: 0,
-      });
+    [false, true].forEach((innerTx) => {
+      it(`Sign${innerTx ? ' inner' : ''} transaction`, async () => {
+        // @ts-expect-error removes object property to restore the original behavior
+        delete wallet._resolveAccount().signTransaction;
+        const tx = await aepp.buildTx({
+          tag: Tag.SpendTx,
+          senderId: aepp.address,
+          recipientId: aepp.address,
+          amount: 0,
+        });
 
-      const signedTx = await aepp.signTransaction(tx);
-      const unpackedTx = unpackTx(signedTx, Tag.SignedTx);
-      const { signatures: [signature], encodedTx } = unpackedTx;
-      const txWithNetwork = concatBuffers([
-        Buffer.from(networkId), hash(decode(buildTx(encodedTx))),
-      ]);
-      expect(verify(txWithNetwork, signature, aepp.address)).to.be.equal(true);
+        const signedTx = await aepp.signTransaction(tx, { innerTx });
+        const unpackedTx = unpackTx(signedTx, Tag.SignedTx);
+        const { signatures: [signature], encodedTx } = unpackedTx;
+        const txWithNetwork = getBufferToSign(buildTx(encodedTx), networkId, innerTx);
+        expect(verify(txWithNetwork, signature, aepp.address)).to.be.equal(true);
+      });
     });
 
     it('Try to sign using unpermited account', async () => {