diff --git a/__tests__/account.test.ts b/__tests__/account.test.ts
index 67cedbfdd..257ec9ce1 100644
--- a/__tests__/account.test.ts
+++ b/__tests__/account.test.ts
@@ -120,11 +120,10 @@ describe('deploy and test Wallet', () => {
       const calldata = { publicKey: pubKey };
 
       // declare account
-      const declareAccount = await account.declare({
+      const declareAccount = await account.declareIfNot({
         contract: compiledOpenZeppelinAccount,
       });
       const accountClassHash = declareAccount.class_hash;
-      await account.waitForTransaction(declareAccount.transaction_hash);
 
       // fund new account
       const tobeAccountAddress = hash.calculateContractAddressFromHash(
@@ -193,6 +192,9 @@ describe('deploy and test Wallet', () => {
   });
 
   describe('simulate transaction - single transaction S0.11.2', () => {
+    test('simulate empty invocations', async () => {
+      await expect(account.simulateTransaction([])).rejects.toThrow(TypeError);
+    });
     test('simulate INVOKE Cairo 0', async () => {
       const res = await account.simulateTransaction([
         {
@@ -245,37 +247,30 @@ describe('deploy and test Wallet', () => {
 
     describeIfDevnet('declare tests only on devnet', () => {
       test('simulate DECLARE - Cairo 0 Contract', async () => {
-        const res = await account.simulateTransaction([
+        const invocation = await provider.prepareInvocations([
           {
             type: TransactionType.DECLARE,
             contract: compiledErc20,
           },
         ]);
-        expect(res).toMatchSchemaRef('SimulateTransactionResponse');
+        if (invocation.length) {
+          const res = await account.simulateTransaction(invocation);
+          expect(res).toMatchSchemaRef('SimulateTransactionResponse');
+        }
       });
     });
 
     test('simulate DECLARE - Cairo 1 Contract - test if not already declared', async () => {
-      const declareContractPayload = extractContractHashes({
-        contract: compiledHelloSierra,
-        casm: compiledHelloSierraCasm,
-      });
-      let skip = false;
-      try {
-        await account.getClassByHash(declareContractPayload.classHash);
-        skip = true;
-      } catch (error) {
-        /* empty */
-      }
+      const invocation = await provider.prepareInvocations([
+        {
+          type: TransactionType.DECLARE,
+          contract: compiledHelloSierra,
+          casm: compiledHelloSierraCasm,
+        },
+      ]);
 
-      if (!skip) {
-        const res = await account.simulateTransaction([
-          {
-            type: TransactionType.DECLARE,
-            contract: compiledHelloSierra,
-            casm: compiledHelloSierraCasm,
-          },
-        ]);
+      if (invocation.length) {
+        const res = await account.simulateTransaction(invocation);
         expect(res).toMatchSchemaRef('SimulateTransactionResponse');
       }
     });
@@ -625,6 +620,10 @@ describe('deploy and test Wallet', () => {
       expect(result).toMatchSchemaRef('EstimateFee');
     });
 
+    test('estimate fee bulk on empty invocations', async () => {
+      await expect(account.estimateFeeBulk([])).rejects.toThrow(TypeError);
+    });
+
     test('estimate fee bulk invoke functions', async () => {
       // TODO @dhruvkelawala check expectation for feeTransactionVersion
       // const innerInvokeEstFeeSpy = jest.spyOn(account.signer, 'signTransaction');
@@ -696,22 +695,80 @@ describe('deploy and test Wallet', () => {
     });
 
     describeIfDevnet('declare tests only on devnet', () => {
-      test('declare, deploy & multi invoke functions', async () => {
-        const res = await account.estimateFeeBulk([
-          /*         {
-            // Cairo 1.1.0, if declared estimate error with can't redeclare same contract
-            type: TransactionType.DECLARE,
-            contract: compiledHelloSierra,
-            casm: compiledHelloSierraCasm,
-          }, */
+      test('Manual: declare, deploy & multi invoke functions', async () => {
+        /*
+         * For Cairo0 and Cairo1 contracts re-declaration of the class throw an errors
+         * as soo We first need to test is class is already declared
+         */
+        const isDeclaredCairo0 = await account.isClassDeclared({
+          classHash: '0x54328a1075b8820eb43caf0caa233923148c983742402dcfc38541dd843d01a',
+        });
+
+        const hashes = extractContractHashes({
+          contract: compiledHelloSierra,
+          casm: compiledHelloSierraCasm,
+        });
+
+        const isDeclaredCairo1 = await account.isClassDeclared({ classHash: hashes.classHash });
+
+        const invocations = [
           {
-            // Cairo 0
-            type: TransactionType.DECLARE,
+            type: TransactionType.INVOKE,
+            payload: [
+              {
+                contractAddress: erc20Address,
+                entrypoint: 'approve',
+                calldata: {
+                  address: erc20Address,
+                  amount: uint256(10),
+                },
+              },
+              {
+                contractAddress: erc20Address,
+                entrypoint: 'transfer',
+                calldata: [erc20.address, '10', '0'],
+              },
+            ],
+          },
+          {
+            type: TransactionType.DEPLOY,
             payload: {
-              contract: compiledErc20,
               classHash: '0x54328a1075b8820eb43caf0caa233923148c983742402dcfc38541dd843d01a',
+              constructorCalldata: ['Token', 'ERC20', account.address],
             },
           },
+          ...(!isDeclaredCairo0
+            ? [
+                {
+                  // Cairo 0
+                  type: TransactionType.DECLARE,
+                  payload: {
+                    contract: compiledErc20,
+                    classHash: '0x54328a1075b8820eb43caf0caa233923148c983742402dcfc38541dd843d01a',
+                  },
+                },
+              ]
+            : []),
+          ...(!isDeclaredCairo1
+            ? [
+                {
+                  // Cairo 1.1.0, if declared estimate error with can't redeclare same contract
+                  type: TransactionType.DECLARE,
+                  contract: compiledHelloSierra,
+                  casm: compiledHelloSierraCasm,
+                },
+              ]
+            : []),
+        ];
+
+        const res = await account.estimateFeeBulk(invocations);
+        res.forEach((value) => {
+          expect(value).toMatchSchemaRef('EstimateFee');
+        });
+      });
+
+      test('prepareInvocations: unordered declare, deploy & multi invoke', async () => {
+        const invocations = await provider.prepareInvocations([
           {
             type: TransactionType.DEPLOY,
             payload: {
@@ -737,8 +794,23 @@ describe('deploy and test Wallet', () => {
               },
             ],
           },
+          {
+            // Cairo 0
+            type: TransactionType.DECLARE,
+            payload: {
+              contract: compiledErc20,
+              classHash: '0x54328a1075b8820eb43caf0caa233923148c983742402dcfc38541dd843d01a',
+            },
+          },
+          {
+            // Cairo 1.1.0, if declared estimate error with can't redeclare same contract
+            type: TransactionType.DECLARE,
+            contract: compiledHelloSierra,
+            casm: compiledHelloSierraCasm,
+          },
         ]);
-        expect(res).toHaveLength(3);
+
+        const res = await account.estimateFeeBulk(invocations);
         res.forEach((value) => {
           expect(value).toMatchSchemaRef('EstimateFee');
         });
diff --git a/src/account/default.ts b/src/account/default.ts
index 951246743..aa9154748 100644
--- a/src/account/default.ts
+++ b/src/account/default.ts
@@ -1,5 +1,6 @@
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
 import type { SPEC } from 'starknet-types-07';
+
 import {
   OutsideExecutionCallerAny,
   SNIP9_V1_INTERFACE_ID,
@@ -53,16 +54,16 @@ import {
   type OutsideExecutionOptions,
   type OutsideTransaction,
 } from '../types/outsideExecution';
-import {
-  buildExecuteFromOutsideCallData,
-  getOutsideCall,
-  getTypedData,
-} from '../utils/outsideExecution';
 import { CallData } from '../utils/calldata';
 import { extractContractHashes, isSierra } from '../utils/contract';
 import { parseUDCEvent } from '../utils/events';
 import { calculateContractAddressFromHash } from '../utils/hash';
 import { isHex, toBigInt, toCairoBool, toHex } from '../utils/num';
+import {
+  buildExecuteFromOutsideCallData,
+  getOutsideCall,
+  getTypedData,
+} from '../utils/outsideExecution';
 import { parseContract } from '../utils/provider';
 import { isString } from '../utils/shortString';
 import { supportsInterface } from '../utils/src5';
@@ -279,6 +280,7 @@ export class Account extends Provider implements AccountInterface {
     invocations: Invocations,
     details: UniversalDetails = {}
   ): Promise<EstimateFeeBulk> {
+    if (!invocations.length) throw TypeError('Invocations should be non-empty array');
     const { nonce, blockIdentifier, version, skipValidate } = details;
     const accountInvocations = await this.accountInvocationsFactory(invocations, {
       ...v3Details(details),
@@ -304,6 +306,7 @@ export class Account extends Provider implements AccountInterface {
     invocations: Invocations,
     details: SimulateTransactionDetails = {}
   ): Promise<SimulateTransactionResponse> {
+    if (!invocations.length) throw TypeError('Invocations should be non-empty array');
     const { nonce, blockIdentifier, skipValidate = true, skipExecute, version } = details;
     const accountInvocations = await this.accountInvocationsFactory(invocations, {
       ...v3Details(details),
diff --git a/src/provider/rpc.ts b/src/provider/rpc.ts
index 7b16f1735..28ee0cdb5 100644
--- a/src/provider/rpc.ts
+++ b/src/provider/rpc.ts
@@ -1,4 +1,5 @@
 import type { SPEC } from 'starknet-types-07';
+
 import { RPC06, RPC07, RpcChannel } from '../channel';
 import {
   AccountInvocations,
@@ -8,12 +9,14 @@ import {
   BlockTag,
   Call,
   ContractClassResponse,
+  ContractClassIdentifier,
   ContractVersion,
   DeclareContractTransaction,
   DeployAccountContractTransaction,
   GetBlockResponse,
   GetTxReceiptResponseWithoutHelper,
   Invocation,
+  Invocations,
   InvocationsDetailsWithNonce,
   PendingBlock,
   PendingStateUpdate,
@@ -25,24 +28,24 @@ import {
   getContractVersionOptions,
   getEstimateFeeBulkOptions,
   getSimulateTransactionOptions,
-  waitForTransactionOptions,
   type Signature,
   type TypedData,
+  waitForTransactionOptions,
 } from '../types';
 import type { TransactionWithHash } from '../types/provider/spec';
 import assert from '../utils/assert';
+import { CallData } from '../utils/calldata';
 import { getAbiContractVersion } from '../utils/calldata/cairo';
-import { isSierra } from '../utils/contract';
+import { extractContractHashes, isSierra } from '../utils/contract';
+import { solidityUint256PackedKeccak256 } from '../utils/hash';
 import { isBigNumberish, toBigInt, toHex } from '../utils/num';
 import { wait } from '../utils/provider';
 import { RPCResponseParser } from '../utils/responseParser/rpc';
+import { formatSignature } from '../utils/stark';
 import { GetTransactionReceiptResponse, ReceiptTx } from '../utils/transactionReceipt';
+import { getMessageHash, validateTypedData } from '../utils/typedData';
 import { LibraryError } from './errors';
 import { ProviderInterface } from './interface';
-import { solidityUint256PackedKeccak256 } from '../utils/hash';
-import { CallData } from '../utils/calldata';
-import { formatSignature } from '../utils/stark';
-import { getMessageHash, validateTypedData } from '../utils/typedData';
 
 export class RpcProvider implements ProviderInterface {
   public responseParser: RPCResponseParser;
@@ -570,4 +573,62 @@ export class RpcProvider implements ProviderInterface {
 
     throw Error(`Signature verification Error: ${error}`);
   }
+
+  /**
+   * Test if class is already declared from ContractClassIdentifier
+   * Helper method using getClass
+   * @param ContractClassIdentifier
+   * @param blockIdentifier
+   */
+  public async isClassDeclared(
+    contractClassIdentifier: ContractClassIdentifier,
+    blockIdentifier?: BlockIdentifier
+  ) {
+    let classHash: string;
+    if (!contractClassIdentifier.classHash && 'contract' in contractClassIdentifier) {
+      const hashes = extractContractHashes(contractClassIdentifier);
+      classHash = hashes.classHash;
+    } else if (contractClassIdentifier.classHash) {
+      classHash = contractClassIdentifier.classHash;
+    } else {
+      throw Error('contractClassIdentifier type not satisfied');
+    }
+
+    try {
+      const result = await this.getClass(classHash, blockIdentifier);
+      return result instanceof Object;
+    } catch (error) {
+      if (error instanceof LibraryError) {
+        return false;
+      }
+      throw error;
+    }
+  }
+
+  /**
+   * Build bulk invocations with auto-detect declared class
+   * 1. Test if class is declared if not declare it preventing already declared class error and not declared class errors
+   * 2. Order declarations first
+   * @param invocations
+   */
+  public async prepareInvocations(invocations: Invocations) {
+    const bulk: Invocations = [];
+    // Build new ordered array
+    // eslint-disable-next-line no-restricted-syntax
+    for (const invocation of invocations) {
+      if (invocation.type === TransactionType.DECLARE) {
+        // Test if already declared
+        // eslint-disable-next-line no-await-in-loop
+        const isDeclared = await this.isClassDeclared(
+          'payload' in invocation ? invocation.payload : invocation
+        );
+        if (!isDeclared) {
+          bulk.unshift(invocation);
+        }
+      } else {
+        bulk.push(invocation);
+      }
+    }
+    return bulk;
+  }
 }
diff --git a/src/types/lib/index.ts b/src/types/lib/index.ts
index c5f4d8a34..ba3893cdc 100644
--- a/src/types/lib/index.ts
+++ b/src/types/lib/index.ts
@@ -3,6 +3,7 @@ import { StarknetChainId } from '../../constants';
 import { weierstrass } from '../../utils/ec';
 import { EDataAvailabilityMode, ResourceBounds } from '../api';
 import { CairoEnum } from '../cairoEnum';
+import { ValuesType } from '../helpers/valuesType';
 import { CompiledContract, CompiledSierraCasm, ContractClass } from './contract';
 
 export type WeierstrassSignatureType = weierstrass.SignatureType;
@@ -100,6 +101,11 @@ export type DeclareContractPayload = {
   compiledClassHash?: string;
 };
 
+/**
+ * DeclareContractPayload with classHash or contract defined
+ */
+export type ContractClassIdentifier = DeclareContractPayload | { classHash: string };
+
 export type CompleteDeclareContractPayload = {
   contract: CompiledContract | string;
   classHash: string;