diff --git a/db.json b/db.json
index 7e0d3c0a92..6f4a559cce 100644
--- a/db.json
+++ b/db.json
@@ -1,14 +1,59 @@
 {
-  "posts": [
-    { "id": 1, "title": "Post 1" },
-    { "id": 2, "title": "Post 2" },
-    { "id": 3, "title": "Post 3" }
-  ],
-  "comments": [
-    { "id": 1, "body": "some comment", "postId": 1 },
-    { "id": 2, "body": "some comment", "postId": 1 }
-  ],
-  "profile": {
-    "name": "typicode"
-  }
+  "chains": [
+    { "id": 1, "name": "Ethereum" },
+    { "id": 2, "name": "Binance Smart Chain" },
+    { "id": 3, "name": "Polygon" },
+    { "id": 4, "name": "Avalanche" },
+    { "id": 5, "name": "Fantom" }
+  ],
+  "shortNames": [
+    { "id": 1, "shortName": "ETH", "chainId": 1 },
+    { "id": 2, "shortName": "BSC", "chainId": 2 },
+    { "id": 3, "shortName": "MATIC", "chainId": 3 },
+    { "id": 4, "shortName": "AVAX", "chainId": 4 },
+    { "id": 5, "shortName": "FTM", "chainId": 5 }
+  ],
+  "chainIds": [
+    { "id": 1, "chainId": 1, "chainIdValue": 1 },
+    { "id": 2, "chainId": 2, "chainIdValue": 56 },
+    { "id": 3, "chainId": 3, "chainIdValue": 137 },
+    { "id": 4, "chainId": 4, "chainIdValue": 43114 },
+    { "id": 5, "chainId": 5, "chainIdValue": 250 }
+  ],
+  "networks": [
+    { "id": 1, "network": "mainnet", "chainId": 1 },
+    { "id": 2, "network": "mainnet", "chainId": 2 },
+    { "id": 3, "network": "mainnet", "chainId": 3 },
+    { "id": 4, "network": "mainnet", "chainId": 4 },
+    { "id": 5, "network": "mainnet", "chainId": 5 }
+  ],
+  "nativeCurrencies": [
+    { "id": 1, "name": "Ether", "symbol": "ETH", "decimals": 18, "chainId": 1 },
+    { "id": 2, "name": "Binance Coin", "symbol": "BNB", "decimals": 18, "chainId": 2 },
+    { "id": 3, "name": "Matic", "symbol": "MATIC", "decimals": 18, "chainId": 3 },
+    { "id": 4, "name": "Avalanche", "symbol": "AVAX", "decimals": 18, "chainId": 4 },
+    { "id": 5, "name": "Fantom", "symbol": "FTM", "decimals": 18, "chainId": 5 }
+  ],
+  "rpcUrls": [
+    { "id": 1, "url": "https://mainnet.infura.io/v3/YOUR-PROJECT-ID", "chainId": 1 },
+    { "id": 2, "url": "https://api.mycryptoapi.com/eth", "chainId": 1 },
+    { "id": 3, "url": "https://cloudflare-eth.com", "chainId": 1 },
+    { "id": 4, "url": "https://bsc-dataseed.binance.org/", "chainId": 2 },
+    { "id": 5, "url": "https://bsc-dataseed1.defibit.io/", "chainId": 2 },
+    { "id": 6, "url": "https://bsc-dataseed1.ninicoin.io/", "chainId": 2 },
+    { "id": 7, "url": "https://rpc-mainnet.maticvigil.com/", "chainId": 3 },
+    { "id": 8, "url": "https://rpc-mainnet.matic.network", "chainId": 3 },
+    { "id": 9, "url": "https://rpc-mainnet.matic.quiknode.pro", "chainId": 3 },
+    { "id": 10, "url": "https://api.avax.network/ext/bc/C/rpc", "chainId": 4 },
+    { "id": 11, "url": "https://api.avax-test.network/ext/bc/C/rpc", "chainId": 4 },
+    { "id": 12, "url": "https://rpcapi.fantom.network", "chainId": 5 },
+    { "id": 13, "url": "https://rpc.fantom.network", "chainId": 5 }
+  ],
+  "blockExplorerUrls": [
+    { "id": 1, "url": "https://etherscan.io", "chainId": 1 },
+    { "id": 2, "url": "https://bscscan.com", "chainId": 2 },
+    { "id": 3, "url": "https://polygonscan.com", "chainId": 3 },
+    { "id": 4, "url": "https://cchain.explorer.avax.network", "chainId": 4 },
+    { "id": 5, "url": "https://ftmscan.com", "chainId": 5 }
+  ]
 }
diff --git a/package.json b/package.json
new file mode 100644
index 0000000000..69781416d9
--- /dev/null
+++ b/package.json
@@ -0,0 +1,12 @@
+{
+  "name": "json-server-demo",
+  "version": "1.0.0",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^4.17.1",
+    "json-server": "^0.16.3"
+  }
+}
diff --git a/server.js b/server.js
new file mode 100644
index 0000000000..92b643c59d
--- /dev/null
+++ b/server.js
@@ -0,0 +1,173 @@
+const jsonServer = require('json-server');
+const low = require('lowdb');
+const FileSync = require('lowdb/adapters/FileSync');
+const Memory = require('lowdb/adapters/Memory');
+const fs = require('fs');
+const path = require('path');
+
+const app = jsonServer.create();
+const dbFilePath = path.join(__dirname, 'db.json');
+const adapter = process.env.NODE_ENV === 'production' ? new Memory() : new FileSync(dbFilePath);
+const db = low(adapter);
+
+if (process.env.NODE_ENV === 'production') {
+  const dbData = JSON.parse(fs.readFileSync(dbFilePath, 'utf-8'));
+  db.defaults(dbData).write();
+}
+
+const middlewares = jsonServer.defaults();
+app.use(middlewares);
+app.use(jsonServer.bodyParser);
+
+app.use((req, res, next) => {
+  if (req.method !== 'GET') {
+    const apiKey = req.headers['x-api-key'];
+    const expectedApiKey = '12345678910';
+
+    if (!apiKey || apiKey !== expectedApiKey) {
+      return res.status(403).json({ error: 'Forbidden' });
+    }
+  }
+  next();
+});
+
+app.post('/chains', (req, res) => {
+  const newChain = req.body;
+  const chainId = newChain.id;
+
+  const existingChain = db.get('chains').find({ id: chainId }).value();
+  if (existingChain) {
+    return res.status(400).json({ error: 'Chain with this ID already exists' });
+  }
+
+  db.get('chains').push({ id: chainId, name: newChain.name }).write();
+
+  db.get('shortNames').push({ id: chainId, shortName: newChain.shortName, chainId: chainId }).write();
+  db.get('chainIds').push({ id: chainId, chainId: chainId, chainIdValue: newChain.chainIdValue }).write();
+  db.get('networks').push({ id: chainId, network: newChain.network, chainId: chainId }).write();
+  db.get('nativeCurrencies').push({ 
+    id: chainId, 
+    name: newChain.nativeCurrency.name, 
+    symbol: newChain.nativeCurrency.symbol, 
+    decimals: newChain.nativeCurrency.decimals, 
+    chainId: chainId 
+  }).write();
+  newChain.rpcUrls.forEach((url, index) => {
+    db.get('rpcUrls').push({ id: chainId * 100 + index, url: url, chainId: chainId }).write();
+  });
+  newChain.blockExplorerUrls.forEach((url, index) => {
+    db.get('blockExplorerUrls').push({ id: chainId * 100 + index, url: url, chainId: chainId }).write();
+  });
+
+  res.status(201).json(newChain);
+});
+
+app.put('/chains/:id', (req, res) => {
+  const chainId = parseInt(req.params.id, 10);
+  const updatedChain = req.body;
+
+  const chain = db.get('chains').find({ id: chainId }).value();
+  if (!chain) {
+    return res.status(404).json({ error: 'Chain not found' });
+  }
+
+  db.get('chains').find({ id: chainId }).assign({ name: updatedChain.name }).write();
+
+  db.get('shortNames').find({ chainId: chainId }).assign({ shortName: updatedChain.shortName }).write();
+  db.get('chainIds').find({ chainId: chainId }).assign({ chainIdValue: updatedChain.chainIdValue }).write();
+  db.get('networks').find({ chainId: chainId }).assign({ network: updatedChain.network }).write();
+  db.get('nativeCurrencies').find({ chainId: chainId }).assign({ 
+    name: updatedChain.nativeCurrency.name, 
+    symbol: updatedChain.nativeCurrency.symbol, 
+    decimals: updatedChain.nativeCurrency.decimals 
+  }).write();
+
+  // Удаление старых RPC URLs и блок-эксплореров
+  db.get('rpcUrls').remove({ chainId: chainId }).write();
+  db.get('blockExplorerUrls').remove({ chainId: chainId }).write();
+
+  // Добавление новых RPC URLs и блок-эксплореров
+  updatedChain.rpcUrls.forEach((url, index) => {
+    db.get('rpcUrls').push({ id: chainId * 100 + index, url: url, chainId: chainId }).write();
+  });
+  updatedChain.blockExplorerUrls.forEach((url, index) => {
+    db.get('blockExplorerUrls').push({ id: chainId * 100 + index, url: url, chainId: chainId }).write();
+  });
+
+  res.status(200).json(updatedChain);
+});
+
+app.get('/chains/:id/full', (req, res) => {
+  const chainId = parseInt(req.params.id, 10);
+  const chain = db.get('chains').find({ id: chainId }).value();
+  if (!chain) {
+    return res.status(404).json({ error: 'not found' });
+  }
+
+  const shortName = db.get('shortNames').find({ chainId: chainId }).value();
+  const chainIdValue = db.get('chainIds').find({ chainId: chainId }).value();
+  const network = db.get('networks').find({ chainId: chainId }).value();
+  const nativeCurrency = db.get('nativeCurrencies').find({ chainId: chainId }).value();
+  const rpcUrls = db.get('rpcUrls').filter({ chainId: chainId }).map('url').value();
+  const blockExplorerUrls = db.get('blockExplorerUrls').filter({ chainId: chainId }).map('url').value();
+
+  const fullChainInfo = {
+    ...chain,
+    shortName: shortName ? shortName.shortName : null,
+    chainIdValue: chainIdValue ? chainIdValue.chainIdValue : null,
+    network: network ? network.network : null,
+    nativeCurrency: nativeCurrency ? nativeCurrency : null,
+    rpcUrls: rpcUrls,
+    blockExplorerUrls: blockExplorerUrls
+  };
+
+  res.json(fullChainInfo);
+});
+
+app.get('/chains/full', (req, res) => {
+  const chains = db.get('chains').value();
+
+  const fullChainsInfo = chains.map(chain => {
+    const chainId = chain.id;
+    const shortName = db.get('shortNames').find({ chainId: chainId }).value();
+    const chainIdValue = db.get('chainIds').find({ chainId: chainId }).value();
+    const network = db.get('networks').find({ chainId: chainId }).value();
+    const nativeCurrency = db.get('nativeCurrencies').find({ chainId: chainId }).value();
+    const rpcUrls = db.get('rpcUrls').filter({ chainId: chainId }).map('url').value();
+    const blockExplorerUrls = db.get('blockExplorerUrls').filter({ chainId: chainId }).map('url').value();
+
+    return {
+      ...chain,
+      shortName: shortName ? shortName.shortName : null,
+      chainIdValue: chainIdValue ? chainIdValue.chainIdValue : null,
+      network: network ? network.network : null,
+      nativeCurrency: nativeCurrency ? nativeCurrency : null,
+      rpcUrls: rpcUrls,
+      blockExplorerUrls: blockExplorerUrls
+    };
+  });
+
+  res.json(fullChainsInfo);
+});
+
+app.get('/chains/:id', (req, res) => {
+  const chainId = parseInt(req.params.id, 10);
+  const chain = db.get('chains').find({ id: chainId }).value();
+  if (!chain) {
+    return res.status(404).json({ error: 'not found' });
+  }
+  res.json(chain);
+});
+
+app.use((req, res, next) => {
+  req.app.db = db;
+  next();
+});
+
+const router = jsonServer.router(db);
+app.use(router);
+
+const port = process.env.PORT || 3000;
+app.listen(port, () => {
+  console.log(`JSON Server is running on port ${port}`);
+});
diff --git a/vercel.json b/vercel.json
new file mode 100644
index 0000000000..1def834a00
--- /dev/null
+++ b/vercel.json
@@ -0,0 +1,15 @@
+{
+  "version": 2,
+  "builds": [
+    {
+      "src": "server.js",
+      "use": "@vercel/node"
+    }
+  ],
+  "routes": [
+    {
+      "src": "/(.*)",
+      "dest": "/server.js"
+    }
+  ]
+}