diff --git a/grist.json b/grist.json
new file mode 100644
index 0000000..31c6266
--- /dev/null
+++ b/grist.json
@@ -0,0 +1,5 @@
+{
+  "grist_server": "###GRIST_SERVER###",
+  "grist_doc_id": "###GRIST_DOC_ID###",
+  "grist_api_key": "###GRIST_API_KEY###"
+}
diff --git a/grpcbalancer/grpc-balancer.service b/grpcbalancer/grpc-balancer.service
new file mode 100644
index 0000000..f6197f8
--- /dev/null
+++ b/grpcbalancer/grpc-balancer.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=GRPC Balancer Service
+After=network.target
+
+[Service]
+Type=simple
+User=root
+Group=root
+Environment=PYTHONUNBUFFERED=1
+ExecStart=/usr/bin/python3 /usr/local/bin/grpcbalancer.py
+Restart=always
+RestartSec=2
+
+[Install]
+WantedBy=multi-user.target 
\ No newline at end of file
diff --git a/grpcbalancer/grpcbalancer.py b/grpcbalancer/grpcbalancer.py
new file mode 100644
index 0000000..6a877d5
--- /dev/null
+++ b/grpcbalancer/grpcbalancer.py
@@ -0,0 +1,322 @@
+import threading
+from collections import deque
+from datetime import datetime, timedelta, timezone
+import random
+import logging
+import time
+import json
+import socket
+
+import requests
+from grist_api import GristDocAPI
+from flask import Flask, request, Response
+
+logging.basicConfig(level=logging.INFO)
+app = Flask(__name__)
+
+BACKEND_SERVERS = []
+SERVER_STATS = {}
+STATS_LOCK = threading.Lock()
+ADDRESS_STATS = {}
+ADDRESS_STATS_LOCK = threading.Lock()
+STATISTICS_THRESHOLD = 10
+STATISTICS_WINDOW = timedelta(minutes=10)
+MAX_WORKERS = 500
+MAX_ERROR_RATE = 0.7
+PORT = 5000
+
+HOP_BY_HOP_HEADERS = {
+    'connection',
+    'keep-alive',
+    'proxy-authenticate',
+    'proxy-authorization',
+    'te',
+    'trailers',
+    'transfer-encoding',
+    'upgrade',
+}
+
+class GRIST:
+    def __init__(self, server, doc_id, api_key, logger):
+        self.server = server
+        self.doc_id = doc_id
+        self.api_key = api_key
+        self.logger = logger
+        self.grist = GristDocAPI(doc_id, server=server, api_key=api_key)
+
+    def table_name_convert(self, table_name):
+        return table_name.replace(" ", "_")
+
+    def to_timestamp(self, dtime: datetime) -> int:
+        if dtime.tzinfo is None:
+            dtime = dtime.replace(tzinfo=timezone(timedelta(hours=3))) 
+        return int(dtime.timestamp())
+
+    def insert_row(self, data, table):
+        data = {key.replace(" ", "_"): value for key, value in data.items()}
+        row_id = self.grist.add_records(self.table_name_convert(table), [data])
+        return row_id
+
+    def update_column(self, row_id, column_name, value, table):
+        if isinstance(value, datetime):
+            value = self.to_timestamp(value)
+        column_name = column_name.replace(" ", "_")
+        self.grist.update_records(self.table_name_convert(table), [{ "id": row_id, column_name: value }])
+
+    def delete_row(self, row_id, table):
+        self.grist.delete_records(self.table_name_convert(table), [row_id])
+
+    def update(self, row_id, updates, table):
+        for column_name, value in updates.items():
+            if isinstance(value, datetime):
+                updates[column_name] = self.to_timestamp(value)
+        updates = {column_name.replace(" ", "_"): value for column_name, value in updates.items()}
+        self.grist.update_records(self.table_name_convert(table), [{"id": row_id, **updates}])
+
+    def fetch_table(self, table):
+        return self.grist.fetch_table(self.table_name_convert(table))
+
+    def find_record(self, id=None, state=None, name=None, table=None):
+        if table is None:
+            raise ValueError("Table is not specified")
+        table_data = self.grist.fetch_table(self.table_name_convert(table))
+        if id is not None:
+            record = [row for row in table_data if row.id == id]
+            return record
+        if state is not None and name is not None:
+            record = [row for row in table_data if row.State == state and row.name == name]
+            return record
+        if state is not None:
+            record = [row for row in table_data if row.State == state]
+            return record
+        if name is not None:
+            record = [row for row in table_data if row.Name == name]
+            return record
+
+    def find_settings(self, key, table):
+        table = self.fetch_table(self.table_name_convert(table))
+        for record in table:
+            if record.Setting == key:
+                if record.Value is None or record.Value == "":
+                    raise ValueError(f"Setting {key} blank")
+                return record.Value
+        raise ValueError(f"Setting {key} not found")
+
+
+@app.route('/', methods=['POST'])
+def proxy():
+    data = request.get_data()
+    headers = dict(request.headers)
+    headers.pop('Accept-Encoding', None)
+
+    try:
+        data_json = json.loads(data.decode('utf-8'))
+    except json.JSONDecodeError:
+        logging.warning(f'Invalid JSON from {request.remote_addr}: {data}')
+        return Response('Invalid JSON', status=400)
+
+    # Функция для обновления статистики запросов по адресу
+    def update_address_stats(from_address):
+        now = datetime.now(timezone.utc)
+        with ADDRESS_STATS_LOCK:
+            if from_address not in ADDRESS_STATS:
+                ADDRESS_STATS[from_address] = deque()
+            ADDRESS_STATS[from_address].append(now)
+            # Удаление запросов, вышедших за пределы окна
+            while ADDRESS_STATS[from_address] and ADDRESS_STATS[from_address][0] < now - STATISTICS_WINDOW:
+                ADDRESS_STATS[from_address].popleft()
+
+    # Функция для извлечения 'from' адреса из запроса
+    def extract_from_address(req):
+        params = req.get("params", [])
+        if isinstance(params, list) and len(params) > 0 and isinstance(params[0], dict):
+            return params[0].get("from")
+        return None
+
+    # Проверка, является ли запрос массивом (батч-запрос)
+    if isinstance(data_json, list):
+        for req in data_json:
+            from_address = extract_from_address(req)
+            if from_address:
+                update_address_stats(from_address)
+    elif isinstance(data_json, dict):
+        from_address = extract_from_address(data_json)
+        if from_address:
+            update_address_stats(from_address)
+
+    if data_json.get("method") == "eth_chainId":
+        response_json = {
+            "jsonrpc": "2.0",
+            "id": data_json.get("id"),
+            "result": "0x2105" #base
+        }
+        response_str = json.dumps(response_json)
+        return Response(response_str, status=200, mimetype='application/json')
+
+
+    selected_servers = select_servers()
+    for server in selected_servers:
+        server_url = server['url']
+        server_id = server['id']
+        try:
+            headers['Host'] = server_url.split('//')[-1].split('/')[0]
+            #logging.info(f'Proxying request to {server_url}: {data}')
+            response = requests.post(server_url, data=data, headers=headers, timeout=5)
+            if response.status_code == 200:
+                print(".", end="", flush=True)
+                #MAX_DATA_LENGTH = 20
+                #data_str = data.decode('utf-8')
+                #data_json = json.loads(data_str)
+                #if "jsonrpc" in data_json: data_json.pop("jsonrpc")
+                #if 'params' in data_json and isinstance(data_json['params'], list):
+                #    for idx, param in enumerate(data_json['params']):
+                #        if isinstance(param, dict) and 'data' in param:
+                #            original_data = param['data']
+                #            if isinstance(original_data, str) and len(original_data) > MAX_DATA_LENGTH:
+                #                truncated_data = original_data[:MAX_DATA_LENGTH - len("....SKIPPED")] + "....SKIPPED"
+                #                data_json['params'][idx]['data'] = truncated_data
+                #truncated_data_str = json.dumps(data_json)
+
+
+                #response_str = response.content.decode('utf-8')
+                #response_json = json.loads(response_str)
+                #if "jsonrpc" in response_json: response_json.pop("jsonrpc")
+                #if 'result' in response_json:
+                #    original_result = response_json['result']
+                #    if isinstance(original_result, str) and len(original_result) > MAX_DATA_LENGTH:
+                #        truncated_result = original_result[:MAX_DATA_LENGTH - len("....SKIPPED")] + "....SKIPPED"
+                #        response_json['result'] = truncated_result
+                #truncated_response_str = json.dumps(response_json)
+
+                #logging.info(f'OK: {request.remote_addr}: {truncated_data_str} -> {server_url}: {response.status_code}/{truncated_response_str}')
+                with STATS_LOCK:
+                    SERVER_STATS[server_id].append((datetime.now(timezone.utc), True))
+                filtered_headers = {
+                    k: v for k, v in response.headers.items()
+                    if k.lower() not in HOP_BY_HOP_HEADERS
+                }
+                filtered_headers.pop('Content-Encoding', None)
+                connection_header = response.headers.get('Connection', '')
+                connection_tokens = [token.strip().lower() for token in connection_header.split(',')]
+                for token in connection_tokens:
+                    filtered_headers.pop(token, None)
+                return Response(response.content, status=response.status_code, headers=filtered_headers)
+            else:
+                logging.warning(f'Failed to proxy request to {server_url}: {response.status_code}/{response.content}')
+                with STATS_LOCK:
+                    SERVER_STATS[server_id].append((datetime.now(timezone.utc), False))
+                continue
+        except requests.exceptions.RequestException as e:
+            logging.error(f'Exception while proxying to {server_url}: {e}')
+            with STATS_LOCK:
+                SERVER_STATS[server_id].append((datetime.now(timezone.utc), False))
+            continue
+    return Response('All backend servers are unavailable', status=503)
+
+
+def select_servers():
+    now = datetime.now(timezone.utc)
+    with STATS_LOCK:
+        for server in BACKEND_SERVERS:
+            server_id = server['id']
+            stats = SERVER_STATS[server_id]
+            while stats and stats[0][0] < now - STATISTICS_WINDOW:
+                stats.popleft()
+        total_requests = sum(len(SERVER_STATS[server['id']]) for server in BACKEND_SERVERS)    
+
+    if total_requests < STATISTICS_THRESHOLD:
+        servers = BACKEND_SERVERS.copy()
+        random.shuffle(servers)
+        #logging.info("Total requests below threshold. Shuffled servers: %s", servers)
+        return servers
+
+    server_scores = []
+    with STATS_LOCK:
+        for server in BACKEND_SERVERS:
+            server_id = server['id']
+            stats = SERVER_STATS[server_id]
+            failures = sum(1 for t, success in stats if not success)
+            successes = len(stats) - failures
+            total = successes + failures
+            error_rate = failures / total if total > 0 else 0
+            server_scores.append({
+                'server': server,
+                'failures': failures,
+                'successes': successes,
+                'error_rate': error_rate
+            })
+            #logging.info(f"Server {server_id}: Failures={failures}, Successes={successes}, Error Rate={error_rate:.2f}")
+
+    healthy_servers = [s for s in server_scores if s['error_rate'] <= MAX_ERROR_RATE]
+
+    if not healthy_servers:
+        logging.warning("No healthy servers available.")
+        return BACKEND_SERVERS.copy()
+
+    healthy_servers.sort(key=lambda x: x['error_rate'])
+
+    total_weight = sum(1 - s['error_rate'] for s in healthy_servers)
+    if total_weight == 0:
+        weights = [1 for _ in healthy_servers]
+    else:
+        weights = [(1 - s['error_rate']) / total_weight for s in healthy_servers]
+
+    selected_server = random.choices( [s['server'] for s in healthy_servers], weights=weights, k=1 )[0]
+    selected_servers = [selected_server] + [s['server'] for s in healthy_servers if s['server'] != selected_server]
+    return selected_servers
+
+def upload_stats_to_grist(update_row):
+    while True:
+        try:
+            stats = {}
+            stats['failures'] = 0
+            stats['successes'] = 0
+            stats['rps'] = 0
+            with STATS_LOCK:
+                for server in BACKEND_SERVERS:
+                    server_id = server['id']
+                    stats = SERVER_STATS[server_id]
+                    failures = sum(1 for t, success in stats if not success)
+                    successes = len(stats) - failures
+                    stats['failures'] += failures
+                    stats['successes'] += successes
+                    stats['rps'] += len(stats)/STATISTICS_WINDOW.total_seconds()
+                    #logging.info(f"Server {server_id}: {successes} successes, {failures} failures, Weight: {weight:.2f}")
+            
+            health = f"{stats['successes']}/{stats['failures']}/{stats['rps']}"
+            update_row({"Health": health})
+        except Exception as e:
+            logging.error(f"Failed to upload stats to Grist: {e}")
+        time.sleep(30) 
+
+if __name__ == '__main__':
+    GRIST_ROW_NAME = socket.gethostname()
+    NODES_TABLE = "Nodes"
+    RPC_TABLE = "RPC_list"
+
+    with open('/root/node/grist.json', 'r', encoding='utf-8') as f:
+        grist_data = json.loads(f.read())
+
+    host = grist_data.get('grist_server') 
+    doc_id = grist_data.get('grist_doc_id')
+    api_key = grist_data.get('grist_api_key')
+    grist = GRIST(host, doc_id, api_key, logging)
+    current_vm = grist.find_record(name=GRIST_ROW_NAME, table=NODES_TABLE)[0]
+    def grist_callback(msg): grist.update(current_vm.id, msg, NODES_TABLE)
+
+
+    BACKEND_SERVERS = []
+    SERVER_STATS = {}
+    table = grist.fetch_table(RPC_TABLE)
+    for row in table:
+        if row.URL:
+            server_info = {'id': row.id, 'url': row.URL}
+            BACKEND_SERVERS.append(server_info)
+            SERVER_STATS[row.id] = deque()
+
+    upload_thread = threading.Thread(target=upload_stats_to_grist, daemon=True, args=(grist_callback,))
+    upload_thread.start()
+
+    from waitress import serve
+    logging.info(f"Starting server on port {PORT}")
+    serve(app, host='0.0.0.0', port=PORT, threads=MAX_WORKERS, connection_limit=1000)
diff --git a/playbook.yml b/playbook.yml
index f0939c0..b6f27c7 100644
--- a/playbook.yml
+++ b/playbook.yml
@@ -118,6 +118,40 @@
         name: web3
         extra_args: --break-system-packages
 
+    - name: Install grpcbalancer dependencies
+      ansible.builtin.pip:
+        name: 
+          - grist-api
+          - flask
+          - requests
+          - waitress
+        extra_args: --break-system-packages --no-dependencies
+
+    - name: Create grpcbalancer directory
+      ansible.builtin.file:
+        path: /opt/grpc-balancer
+        state: directory
+        mode: '0755'
+
+    - name: Copy grpcbalancer files
+      ansible.builtin.copy:
+        src: "{{ ansible_env.HOME }}/ritual/grpcbalancer/grpcbalancer.py"
+        dest: /usr/local/bin/grpc-balancer
+        mode: '0755'
+
+    - name: Install grpcbalancer service
+      ansible.builtin.copy:
+        src: "{{ ansible_env.HOME }}/ritual/grpcbalancer/grpc-balancer.service"
+        dest: /etc/systemd/system/
+        mode: '0644'
+
+    - name: Start and enable grpcbalancer service
+      ansible.builtin.systemd:
+        name: grpc-balancer
+        state: started
+        enabled: yes
+        daemon_reload: yes
+
 #    - name: Install Docker
 #      ansible.builtin.shell: curl -sL https://get.docker.com | sudo sh -
 #
@@ -171,11 +205,18 @@
       async: "{{ 60 * 15 }}"
       poll: 30
 
-    - name: Update wallet, private key and RPC URL in project
-      ansible.builtin.shell: bash update.sh {{ wallet }} {{ private_key }} {{ rpc_url }}
+    - name: Update environment variables
+      ansible.builtin.shell: |
+        ./update.sh ID "{{ id }}" 
+        ./update.sh GRIST_SERVER "{{ grist_server }}"
+        ./update.sh GRIST_DOC_ID "{{ grist_doc_id }}"
+        ./update.sh GRIST_API_KEY "{{ grist_api_key }}"
+        ./update.sh WALLET_ADDRESS "{{ wallet }}"
+        ./update.sh PRIVATE_KEY "{{ private_key }}"
+        ./update.sh RPC_URL "{{ rpc_url }}"
       args:
         chdir: "{{ ansible_env.HOME }}/ritual"
-        
+      changed_when: false
 
     - name: Install Forge and Infernet SDK
       ansible.builtin.shell: |
diff --git a/update.sh b/update.sh
index de308c6..a32cfbc 100644
--- a/update.sh
+++ b/update.sh
@@ -13,6 +13,7 @@ RPC_URL=$3
 FILES=(
     "./projects/hello-world/container/config.json"
     "./projects/hello-world/contracts/Makefile"
+    "grist.json"
 )
 
 for FILE in "${FILES[@]}"; do
@@ -21,3 +22,28 @@ for FILE in "${FILES[@]}"; do
     sed -i "s|###PRIVATE_KEY###|$PRIVATE_KEY|g" "$EXPANDED_FILE"
     sed -i "s|###RPC_URL###|$RPC_URL|g" "$EXPANDED_FILE"
 done
+
+
+
+
+#!/usr/bin/env bash
+
+if [ "$#" -ne 2 ]; then
+    echo "Usage: $0 <PARAMETER> <NEW_VALUE>"
+    exit 1
+fi
+
+PARAMETER=$1
+NEW_VALUE=$2
+
+# Список файлов
+FILES=(
+    "./projects/hello-world/container/config.json"
+    "./projects/hello-world/contracts/Makefile"
+    "grist.json"
+)
+
+for FILE in "${FILES[@]}"; do
+    EXPANDED_FILE=$(eval echo "$FILE")
+    sed -i "s|###$PARAMETER###|$NEW_VALUE|g" "$EXPANDED_FILE"
+done
\ No newline at end of file