Watermellon Scalper Bot (AsterDEX)

Next.js + TypeScript codebase that recreates the TradingView “Watermellon” script (EMA 8/21/48 + RSI14) on top of AsterDEX ticks. The app currently exposes the spec/UI scaffold plus a core library for synthetic 30 s bars, indicator math, and Watermellon trigger logic. Execution, risk, and exchange connectivity will be layered on top of these primitives.

Prerequisites

• Node.js 20+
• npm (bundled) or pnpm/bun if you prefer, but scripts assume npm

Install & run

cd aster-bot
npm install
npm run dev   # spec/dashboard
npm run bot   # headless trading loop

Visit http://localhost:3000 for the spec dashboard. npm run bot loads .env.local, connects to the tick stream, and runs the Watermellon engine (dry-run adapter by default).

Environment

Copy the sample vars and adjust:

cp env.example .env.local

Variable	Description
ASTER_RPC_URL, ASTER_WS_URL	HTTPS + WebSocket endpoints for AsterDEX
ASTER_API_KEY / ASTER_API_SECRET	API credentials created on asterdex.com
ASTER_PRIVATE_KEY	Wallet key dedicated to this bot
PAIR_SYMBOL	Market to trade (e.g., ASTERUSDT-PERP)
Strategy overrides	Optional VIRTUAL_TIMEFRAME_MS, EMA_FAST, EMA_MID, EMA_SLOW, RSI_LENGTH, RSI_MIN_LONG, RSI_MAX_SHORT
Risk params	MAX_POSITION_USDT, MAX_LEVERAGE, MAX_FLIPS_PER_HOUR, optional STOP_LOSS_PCT, TAKE_PROFIT_PCT
MODE	dry-run or live

Project layout

src/
  app/                 # Next.js dashboard + spec route
  bot/                 # Headless runner entry (npm run bot)
  lib/
    bot/               # Strategy orchestration
    indicators/        # EMA / RSI
    execution/         # Dry-run/live adapters
    tickStream.ts      # WebSocket feed client
    config.ts          # Zod env parser
    virtualBarBuilder.ts
    watermellonEngine.ts

The bot includes synthetic bar building, indicator math, risk-aware position management, and a dry-run executor that logs trades. Swap in a live execution adapter when you’re ready to send real orders.