Frontend url: https://crypto-crash-backend.vercel.app/

Backend url: https://crypto-crash-backend-m4w8.onrender.com/

🎮 Crypto Crash Game (Backend)

Below api endpoint is created in postman.

user_id: 688b57d79a5c82fc9b343799
name :king
IMP : Please use the above user_ID instead random_ID for testing purpose, use this in front end deployed link, also run backend url first then move to frontend url.

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A real-time multiplayer backend for a Crypto Crash betting game built with Node.js, Express, WebSocket, and MongoDB. Players place bets with BTC/ETH, watch the multiplier grow, and try to cash out before the game crashes!

🚀 Features

• 📈 Real-time multiplier updates via WebSockets
• 🎲 Provably fair crash algorithm
• 💵 USD-to-crypto conversion using live Binance prices
• 👤 Player wallet and balance management
• 🧾 Transaction history for bets, cashouts, and losses
• 📊 MongoDB models for players, rounds, and transactions
• 🔐 Secure cashout logic that rewards only pre-crash exits

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🛠️ Tech Stack

• Node.js with Express
• MongoDB with Mongoose
• Socket.IO for real-time communication
• Binance API for live crypto prices
• Crypto module for provably fair logic

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Images:

Bet placed:

After Cashout:

🗂️ Project Structure

crypto-crash-backend/

├── server.js

├── .env

├── config/

├── models/

|__ public/

├── services/

├── routes/

├── middleware/

├── sockets/

├── utils/

├── public/

├── scripts/

├── docs/

🧪 Run Locally

1. Clone the repo

git clone https://github.com/sanjaykumar200599/Crypto_crash_backend.git
cd Crypto_crash_backend

2. Install dependencies

npm install

3. Configure Environment Create a .env file (if needed) or ensure the following values are set:

MONGODB_URI=mongodb+srv://<your_connection_string>
PORT=3000
You can also configure crash constants in /config/constants.js:

4. Run the server

node server.js

🌐 WebSocket Events Event Direction Description

place_bet Client → Server Submit a bet

cash_out Client → Server Request to cash out early

round_start Server → Client New round begins

multiplier_update Server → Client Multiplier increases

round_end Server → Client Round ends (crash point hit)

player_cashed_out Server → Client Broadcast when player exits early