diff --git a/robot/resources/lib/gates.py b/robot/resources/lib/gates.py
index 7484a93..5400f55 100644
--- a/robot/resources/lib/gates.py
+++ b/robot/resources/lib/gates.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/python3.8
 
 import logging
 import os
diff --git a/robot/resources/lib/neofs.py b/robot/resources/lib/neofs.py
index 417f45d..2019a0b 100644
--- a/robot/resources/lib/neofs.py
+++ b/robot/resources/lib/neofs.py
@@ -1,20 +1,21 @@
 #!/usr/bin/python3.8
 
-import subprocess
+import base58
+import base64
+import binascii
+from datetime import datetime
+import docker
+import hashlib
+import json
 import os
 import re
-import hashlib
+import random
+import subprocess
+
+from neo3 import wallet
 from robot.api.deco import keyword
 from robot.api import logger
-import random
-import base64
-import base58
-import docker
-import json
-import tarfile
-import binascii
 
-from datetime import datetime
 from common import *
 
 ROBOT_AUTO_KEYWORDS = False
@@ -24,22 +25,9 @@ NEOFS_CLI_EXEC = os.getenv('NEOFS_CLI_EXEC', 'neofs-cli')
 
 
 @keyword('Get ScriptHash')
-def get_scripthash(privkey: str):
-    scripthash = ""
-    Cmd = f'{NEOFS_CLI_EXEC} util keyer -u {privkey}'
-    logger.info("Cmd: %s" % Cmd)
-    complProc = subprocess.run(Cmd, check=True, universal_newlines=True,
-                stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=150, shell=True)
-    output = complProc.stdout
-    logger.info("Output: %s" % output)
-
-    m = re.search(r'ScriptHash3.0   (\w+)', output)
-    if m.start() != m.end():
-        scripthash = m.group(1)
-    else:
-        raise Exception("Can not get ScriptHash.")
-
-    return scripthash
+def get_scripthash(wif: str):
+    acc = wallet.Account.from_wif(wif, '')
+    return str(acc.script_hash)
 
 
 @keyword('Stop nodes')
@@ -279,7 +267,7 @@ def get_range(private_key: str, cid: str, oid: str, range_file: str, bearer: str
         raise Exception("command '{}' return with error (code {}): {}".format(e.cmd, e.returncode, e.output))
 
 @keyword('Create container')
-def create_container(private_key: str, basic_acl:str, rule:str, user_headers: str=None):
+def create_container(private_key: str, basic_acl:str, rule:str, user_headers: str=''):
     if rule == "":
         logger.error("Cannot create container with empty placement rule")
 
@@ -295,7 +283,7 @@ def create_container(private_key: str, basic_acl:str, rule:str, user_headers: st
     logger.info("Cmd: %s" % createContainerCmd)
     try:
         complProc = subprocess.run(createContainerCmd, check=True, universal_newlines=True,
-                    stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=300, shell=True)
+                    stdout=subprocess.PIPE, stderr=subprocess.STDOUT, timeout=300, shell=True)
         output = complProc.stdout
         logger.info("Output: %s" % output)
         cid = _parse_cid(output)
@@ -364,9 +352,11 @@ def search_object(private_key: str, cid: str, keys: str, bearer: str, filters: s
 
         if expected_objects_list:
             if sorted(found_objects) == sorted(expected_objects_list):
-                logger.info("Found objects list '{}' is equal for expected list '{}'".format(found_objects, expected_objects_list))
+                logger.info(f"Found objects list '{found_objects}' ",
+                            f"is equal for expected list '{expected_objects_list}'")
             else:
-                raise Exception("Found object list '{}' is not equal to expected list '{}'".format(found_objects, expected_objects_list))
+                raise Exception(f"Found object list {found_objects} ",
+                                f"is not equal to expected list '{expected_objects_list}'")
 
         return found_objects
 
@@ -550,7 +540,7 @@ def _get_raw_split_information(header):
         result_header['Type'] = m.group(1)
     else:
         raise Exception("no Type was parsed from object header: \t%s" % header)
-    
+
     # PayloadLength
     m = re.search(r'Size: (\d+)', header)
     if m is not None:
@@ -581,7 +571,7 @@ def _get_raw_split_information(header):
         result_header['Split ChildID'] = found_objects
     logger.info("Result: %s" % result_header)
 
-    return result_header 
+    return result_header
 
 @keyword('Verify Head Tombstone')
 def verify_head_tombstone(private_key: str, cid: str, oid_ts: str, oid: str, addr: str):
@@ -755,7 +745,7 @@ def decode_object_system_header_json(header):
         result_header["PayloadLength"] = PayloadLength
     else:
         raise Exception("no PayloadLength was parsed from header: \t%s" % header)
-    
+
 
     # HomoHash
     HomoHash = json_header["header"]["homomorphicHash"]["sum"]
@@ -770,14 +760,14 @@ def decode_object_system_header_json(header):
         Checksum_64_d = base64.b64decode(Checksum)
         result_header["Checksum"] = binascii.hexlify(Checksum_64_d)
     else:
-        raise Exception("no Checksum was parsed from header: \t%s" % header)   
+        raise Exception("no Checksum was parsed from header: \t%s" % header)
 
     # Type
     Type = json_header["header"]["objectType"]
     if Type is not None:
         result_header["Type"] = Type
     else:
-        raise Exception("no Type was parsed from header: \t%s" % header)    
+        raise Exception("no Type was parsed from header: \t%s" % header)
 
     # Header - Optional attributes
 
diff --git a/robot/resources/lib/payment_neogo.py b/robot/resources/lib/payment_neogo.py
index 9657196..533160e 100644
--- a/robot/resources/lib/payment_neogo.py
+++ b/robot/resources/lib/payment_neogo.py
@@ -1,24 +1,24 @@
 #!/usr/bin/python3
 
-import subprocess
+import os
 import pexpect
 import re
-import uuid
-import requests
-import json
-import os
 
 from robot.api.deco import keyword
 from robot.api import logger
-import robot.errors
-from robot.libraries.BuiltIn import BuiltIn
+from neo3 import wallet
 
 from common import *
+import rpc_client
 
 ROBOT_AUTO_KEYWORDS = False
 
 # path to neofs-cli executable
-NEOFS_CLI_EXEC = os.getenv('NEOFS_CLI_EXEC', 'neofs-cli')
+BALANCE_CONTRACT_HASH = os.getenv('NEOFS_CONTRACTS_BALANCE')
+MORPH_TOKEN_POWER = 12
+
+morph_rpc_cli = rpc_client.RPCClient(NEOFS_NEO_API_ENDPOINT)
+mainnet_rpc_cli = rpc_client.RPCClient(NEO_MAINNET_ENDPOINT)
 
 
 @keyword('Withdraw Mainnet Gas')
@@ -40,65 +40,47 @@ def withdraw_mainnet_gas(wallet: str, address: str, scripthash: str, amount: int
 
 
 @keyword('Transaction accepted in block')
-def transaction_accepted_in_block(tx_id):
+def transaction_accepted_in_block(tx_id: str):
     """
     This function return True in case of accepted TX.
     Parameters:
-    :param tx_id:           transaction is
-    :rtype:                 block number or Exception
+    :param tx_id:           transaction ID
     """
 
-    logger.info("Transaction id: %s" % tx_id)
-
-    headers = {'Content-type': 'application/json'}
-    data = { "jsonrpc": "2.0", "id": 5, "method": "gettransactionheight", "params": [ tx_id ] }
-    response = requests.post(NEO_MAINNET_ENDPOINT, json=data, headers=headers, verify=False)
-
-    if not response.ok:
-        raise Exception(f"""Failed:
-                request: {data},
-                response: {response.text},
-                status code: {response.status_code} {response.reason}""")
-
-    if (response.text == 0):
-        raise Exception( "Transaction is not found in the blocks." )
-
-    logger.info("Transaction has been found in the block %s." % response.text )
-    return response.text
+    try:
+        resp = mainnet_rpc_cli.get_transaction_height(tx_id)
+        if resp is not None:
+            logger.info(f"got block height: {resp}")
+            return True
+    except Exception as e:
+        logger.info(f"request failed with error: {e}")
+        raise e
 
 
 @keyword('Get NeoFS Balance')
-def get_balance(privkey: str):
+def get_balance(wif: str):
     """
-    This function returns NeoFS balance for selected public key.
-    :param public_key:      neo public key
+    This function returns NeoFS balance for given WIF.
     """
 
-    balance = _get_balance_request(privkey)
+    acc = wallet.Account.from_wif(wif, '')
+    payload = [
+                {
+                    'type': 'Hash160',
+                    'value': str(acc.script_hash)
+                }
+            ]
+    try:
+        resp = morph_rpc_cli.invoke_function(
+                BALANCE_CONTRACT_HASH, 'balanceOf', payload
+            )
+        logger.info(resp)
+        value = int(resp['stack'][0]['value'])
+        return value/(10**MORPH_TOKEN_POWER)
+    except Exception as e:
+        logger.error(f"failed to get {wif} balance: {e}")
+        raise e
 
-    return float(balance)
-
-
-def _get_balance_request(privkey: str):
-    '''
-    Internal method.
-    '''
-    Cmd = (
-        f'{NEOFS_CLI_EXEC} --wif {privkey} --rpc-endpoint {NEOFS_ENDPOINT}'
-        f' accounting balance'
-    )
-    logger.info(f"Cmd: {Cmd}")
-    complProc = subprocess.run(Cmd, check=True, universal_newlines=True,
-                stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=150, shell=True)
-    output = complProc.stdout
-    logger.info(f"Output: {output}")
-
-    if output is None:
-        BuiltIn().fatal_error(f'Can not parse balance: "{output}"')
-
-    logger.info(f"Balance for '{privkey}' is '{output}'" )
-
-    return output
 
 def _run_sh_with_passwd(passwd, cmd):
     p = pexpect.spawn(cmd)
diff --git a/robot/resources/lib/payment_operations.robot b/robot/resources/lib/payment_operations.robot
index e6c5b3d..752c0da 100644
--- a/robot/resources/lib/payment_operations.robot
+++ b/robot/resources/lib/payment_operations.robot
@@ -41,5 +41,5 @@ Payment Operations
     # For certainty, sleeping during one morph block.
     Sleep                   ${MORPH_BLOCK_TIME}
 
-    ${NEOFS_BALANCE} =  Get NeoFS Balance       ${WIF}
-    Should Be Equal As Numbers                  ${NEOFS_BALANCE}    ${DEPOSIT_AMOUNT}
+    ${NEOFS_BALANCE} =      Get NeoFS Balance       ${WIF}
+    Should Be Equal As Numbers      ${NEOFS_BALANCE}    ${DEPOSIT_AMOUNT}
diff --git a/robot/resources/lib/utility_keywords.py b/robot/resources/lib/utility_keywords.py
index f53eda2..865fd8f 100644
--- a/robot/resources/lib/utility_keywords.py
+++ b/robot/resources/lib/utility_keywords.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python3.7
+#!/usr/bin/python3.8
 
 import docker
 import os
diff --git a/robot/testsuites/integration/network/netmap_simple.robot b/robot/testsuites/integration/network/netmap_simple.robot
index f3deafd..0634328 100644
--- a/robot/testsuites/integration/network/netmap_simple.robot
+++ b/robot/testsuites/integration/network/netmap_simple.robot
@@ -85,10 +85,10 @@ Generate Key and Pre-payment
 Validate Policy
     [Arguments]    ${POLICY}    ${EXPECTED_VAL}     @{EXPECTED_LIST}
 
-                        Log	                                Container with rule ${POLICY}
+                        Log	                   Container with rule ${POLICY}
 
-    ${CID} =            Create container                    ${PRIV_KEY}    ${EMPTY}      ${POLICY}
-                        Container Existing                  ${PRIV_KEY}    ${CID}
+    ${CID} =            Create container           ${PRIV_KEY}    ${EMPTY}      ${POLICY}
+                        Container Existing         ${PRIV_KEY}    ${CID}
     ${S_OID} =          Put object                 ${PRIV_KEY}    ${FILE}       ${CID}        ${EMPTY}     ${EMPTY}
-                        Validate storage policy for object  ${PRIV_KEY}    ${EXPECTED_VAL}             ${CID}       ${S_OID}   @{EXPECTED_LIST}
+                        Validate storage policy for object      ${PRIV_KEY}    ${EXPECTED_VAL}             ${CID}       ${S_OID}   ${EXPECTED_LIST}
                         Get object               ${PRIV_KEY}    ${CID}    ${S_OID}    ${EMPTY}    s_file_read
diff --git a/robot/testsuites/integration/object/object_simple.robot b/robot/testsuites/integration/object/object_simple.robot
index bfdb9b0..7a24550 100644
--- a/robot/testsuites/integration/object/object_simple.robot
+++ b/robot/testsuites/integration/object/object_simple.robot
@@ -3,6 +3,7 @@ Variables   ../../../variables/common.py
 
 Library     ../${RESOURCES}/neofs.py
 Library     ../${RESOURCES}/payment_neogo.py
+Library     ${KEYWORDS}/contract_keywords.py
 
 Resource    common_steps_object.robot
 Resource    ../${RESOURCES}/payment_operations.robot
diff --git a/robot/variables/common.py b/robot/variables/common.py
index faf1c26..7691aad 100644
--- a/robot/variables/common.py
+++ b/robot/variables/common.py
@@ -16,7 +16,7 @@ ABSOLUTE_FILE_PATH="/robot/testsuites/integration"
 NEOFS_EPOCH_TIMEOUT = (os.getenv("NEOFS_EPOCH_TIMEOUT") if os.getenv("NEOFS_EPOCH_TIMEOUT")
                   else os.getenv("NEOFS_IR_TIMERS_EPOCH", "300s"))
 
-SIMPLE_OBJ_SIZE = os.getenv("SIMPLE_OBJ_SIZE", "1024")
+SIMPLE_OBJ_SIZE = os.getenv("SIMPLE_OBJ_SIZE", "1000")
 COMPLEX_OBJ_SIZE = os.getenv("COMPLEX_OBJ_SIZE", "70000000")
 
 MAINNET_BLOCK_TIME = os.getenv('MAINNET_BLOCK_TIME', "15s")
diff --git a/wallets/selectel_mainnet_wallet.json b/wallets/selectel_mainnet_wallet.json
deleted file mode 100644
index 1612925..0000000
--- a/wallets/selectel_mainnet_wallet.json
+++ /dev/null
@@ -1,72 +0,0 @@
-{
-  "version": "3.0",
-  "accounts": [
-    {
-      "address": "NbTiM6h8r99kpRtb428XcsUk1TzKed2gTc",
-      "key": "6PYN7LvaWqBNw7Xb7a52LSbPnP91kyuzYi3HncGvQwQoYAY2W8DncTgpux",
-      "label": "",
-      "contract": {
-        "script": "DCECs2Ir9AF73+MXxYrtX0x1PyBrfbiWBG+n13S7xL9/jcILQZVEDXg=",
-        "parameters": [
-          {
-            "name": "parameter0",
-            "type": "Signature"
-          }
-        ],
-        "deployed": false
-      },
-      "lock": false,
-      "isdefault": false
-    },
-    {
-      "address": "NUVPACMnKFhpuHjsRjhUvXz1XhqfGZYVtY",
-      "key": "6PYN7LvaWqBNw7Xb7a52LSbPnP91kyuzYi3HncGvQwQoYAY2W8DncTgpux",
-      "label": "",
-      "contract": {
-        "script": "EwwhAhA6f33QFlWFl/eWDSfFFqQ5T9loueZRVetLAT5AQEBuDCECp7xV/oaE4BGXaNEEujB5W9zIZhnoZK3SYVZyPtGFzWIMIQKzYiv0AXvf4xfFiu1fTHU/IGt9uJYEb6fXdLvEv3+NwgwhA9kMB99j5pDOd5EuEKtRrMlEtmhgI3tgjE+PgwnnHuaZFAtBE43vrw==",
-        "parameters": [
-          {
-            "name": "parameter0",
-            "type": "Signature"
-          },
-          {
-            "name": "parameter1",
-            "type": "Signature"
-          },
-          {
-            "name": "parameter2",
-            "type": "Signature"
-          }
-        ],
-        "deployed": false
-      },
-      "lock": false,
-      "isdefault": false
-    },
-    {
-      "address": "NVNvVRW5Q5naSx2k2iZm7xRgtRNGuZppAK",
-      "key": "6PYN7LvaWqBNw7Xb7a52LSbPnP91kyuzYi3HncGvQwQoYAY2W8DncTgpux",
-      "label": "",
-      "contract": {
-        "script": "EQwhArNiK/QBe9/jF8WK7V9MdT8ga324lgRvp9d0u8S/f43CEQtBE43vrw==",
-        "parameters": [
-          {
-            "name": "parameter0",
-            "type": "Signature"
-          }
-        ],
-        "deployed": false
-      },
-      "lock": false,
-      "isdefault": false
-    }
-  ],
-  "scrypt": {
-    "n": 16384,
-    "r": 8,
-    "p": 8
-  },
-  "extra": {
-    "Tokens": null
-  }
-}