diff --git a/src/fetch/GET.ts b/src/fetch/GET.ts
index 464da04..91c300c 100644
--- a/src/fetch/GET.ts
+++ b/src/fetch/GET.ts
@@ -6,6 +6,7 @@ import { db } from "../../index.js";
 import { toJSON } from "../http.js";
 import { Server } from "bun";
 import { logger } from "../logger.js";
+import { websocketClient } from "../websocket/websocketClient.js"
 
 export default async function (req: Request, server: Server) {
     // Bun automatically returns a 101 Switching Protocols
@@ -17,7 +18,7 @@ export default async function (req: Request, server: Server) {
       return;
     }
 
-    const { pathname } = new URL(req.url);
+    const { pathname, searchParams} = new URL(req.url);
     if ( pathname === "/") return new Response(banner())
     if ( pathname === "/health") return checkHealth();
     if ( pathname === "/metrics") return new Response(await prometheus.registry.metrics());
@@ -25,5 +26,6 @@ export default async function (req: Request, server: Server) {
     if ( pathname === "/moduleHashByChain") return toJSON(sqlite.selectAll(db, "moduleHashByChain"));
     if ( pathname === "/traceId") return toJSON(sqlite.selectAll(db, "traceId"));
     if ( pathname === "/chain") return toJSON(sqlite.selectAll(db, "chain"));
+    if ( pathname === "/subscribe") return new Response(await websocketClient(req.url, searchParams));
     return new Response("Not found", { status: 400 });
 }
\ No newline at end of file
diff --git a/src/sqlite.ts b/src/sqlite.ts
index 31e65e4..3629cbb 100644
--- a/src/sqlite.ts
+++ b/src/sqlite.ts
@@ -17,6 +17,7 @@ export function createDb(filename: string) {
     create(db, "moduleHashByChain");
     create(db, "traceId");
     create(db, "chain");
+    createInc(db, "connection");
     return db;
 }
 
@@ -25,6 +26,11 @@ export function create(db: Database, table: string) {
     return db.run(`CREATE TABLE IF NOT EXISTS ${table} (key TEXT PRIMARY KEY, value TEXT)`);
 }
 
+export function createInc(db: Database, table: string) {
+    if ( !table ) throw new Error("table is required");
+    return db.run(`CREATE TABLE IF NOT EXISTS ${table} (key TEXT PRIMARY KEY, value TEXT, timestamp INTEGER)`);
+}
+
 export function replace(db: Database, table: string, key: string, value: string|number) {
     return db.prepare(`REPLACE INTO ${table} (key, value) VALUES (?, ?)`).run(key, value);
 }
@@ -46,6 +52,14 @@ export function exists(db: Database, table: string, key: string ) {
     return select(db, table, key).length > 0;
 }
 
+export function increment(db: Database, table: string, key: string, value: number, timestamp: number) {
+    if ( exists(db, table, key) ) {
+        return db.prepare(`UPDATE ${table} SET value = value + ?, timestamp = ? WHERE key = ?`).run(value, timestamp, key);
+    }
+    return db.prepare(`REPLACE INTO ${table} (key, value, timestamp) VALUES (?, ?, ?)`).run(key, value, timestamp);
+}
+
+
 // TO-DO: UPDATE (increment/decrement)
 // UPDATE product SET price = price + 50 WHERE id = 1
 // UPDATE {table} SET {column} = {column} + {value} WHERE {condition}
\ No newline at end of file
diff --git a/src/websocket/open.ts b/src/websocket/open.ts
index 01c95ed..8016c72 100644
--- a/src/websocket/open.ts
+++ b/src/websocket/open.ts
@@ -2,9 +2,24 @@ import { ServerWebSocket } from "bun";
 import { logger } from "../logger.js";
 import { ServerWebSocketData } from "../../index.js";
 import * as prometheus from "../prometheus.js";
+import { increment, count } from "../sqlite.js";
+import { db } from "../../index.js";
 
 export default function (ws: ServerWebSocket<ServerWebSocketData>) {
-    prometheus.connection_active.inc(1);
-    prometheus.connection_open.inc(1);
-    logger.info('open', {key: ws.data.key, remoteAddress: ws.remoteAddress});
+    //set count as limit
+    const count = true;
+    try {
+        if (count === true) {
+            increment(db, "connection", ws.remoteAddress, 1, Number(Date.now()));
+            prometheus.connection_active.inc(1);
+            prometheus.connection_open.inc(1);
+            logger.info('open', {key: ws.data.key, remoteAddress: ws.remoteAddress});
+        }
+    }
+    catch(e) {
+        logger.error(e);
+        ws.send(JSON.stringify({ status: 429, error: { message: e.message } }));
+        ws.close();
+    }
+
 }
diff --git a/src/websocket/websocketClient.ts b/src/websocket/websocketClient.ts
new file mode 100644
index 0000000..c22bf11
--- /dev/null
+++ b/src/websocket/websocketClient.ts
@@ -0,0 +1,29 @@
+import { randomUUID } from "crypto";
+
+let payload: Array<String> = []
+export async function websocketClient(url: string, searchParams: URLSearchParams){
+    const ws = new WebSocket(url);
+    let moduleHash = ""
+
+    if (!searchParams.has("moduleHash")) throw new Error("moduleHash is required")
+
+    if (!searchParams.has("chain")) moduleHash = searchParams.get("moduleHash")
+    if (searchParams.has("chain")) moduleHash = `${searchParams.get("chain")}:${searchParams.get("moduleHash")}`;
+
+    ws.onopen = () => {
+        console.log("connected");
+        ws.send(JSON.stringify({
+            id: randomUUID(),
+            method: "subscribe",
+            params: {
+                moduleHash: moduleHash
+            }
+        }));
+    };
+
+    ws.onmessage = (event) => {
+        payload.push(String(event.data))
+    };
+
+    return payload
+}
\ No newline at end of file