MarketBot is an AI-powered listing assistant and negotiation bot built to automate Facebook Marketplace sales. Sellers use a Discord bot to create and manage listings. Once posted, the bot interacts with buyers on Facebook Messenger, handles price negotiation using OpenAI, and schedules meetings through Google Calendar once a deal is reached.
This is an early version of the project. Architecture, file structure, and responsibilities are subject to change as development progresses and new requirements emerge.
| Layer | Technology |
|---|---|
| Interface (Sellers) | Discord Bot (discord.js) |
| Interface (Buyers) | Facebook Messenger Bot (Facebook Messenger API) |
| Backend API | Express.js |
| AI Engine | OpenAI (GPT-4) |
| Scheduler | Google Calendar API |
| Database | PostgreSQL |
Discord Bot → Express API ← FB Messenger Bot ↓ PostgreSQL Database ↓ OpenAI Negotiator Logic ↓ Google Calendar Scheduler
/marketbot/
├── discord-bot/ # Handles all Discord bot logic and slash commands
│ ├── commands/ # Commands like createListing, listListings
│ ├── events/ # Bot events (e.g. ready, interaction)
│ ├── discordClient.js # Sets up and exports the bot client
│ └── index.js # Entry point for Discord bot
├── fb-bot/ # Facebook Messenger bot logic
│ ├── fbWebhook.js # Webhook listener for buyer messages
│ └── messageHandler.js # Handles message processing and GPT responses
├── backend/ # Core backend logic
│ ├── api/ # Express.js route definitions
│ │ ├── listings.js # Listing creation and management
│ │ └── scheduler.js # Scheduling logic
│ ├── db/ # PostgreSQL models and connection
│ │ ├── models/ # Models for User, Listing, Conversation
│ │ └── index.js # DB setup
│ ├── ai/ # AI negotiation layer
│ │ └── negotiator.js # OpenAI prompt and logic
│ ├── scheduler/ # Google Calendar integration
│ │ └── calendar.js # Handles event creation
│ └── server.js # Starts backend server
├── prisma/ # Database schema/migrations (Prisma)
├── .env # Environment variables
├── package.json # Project scripts and dependencies
└── README.md # You're here!
- Clone and Install
git clone https://github.com/your-org/marketbot.git
cd marketbot
npm install- Add Environment Variables (will add later)
DISCORD_TOKEN=your_token
FB_VERIFY_TOKEN=your_token
FB_PAGE_ACCESS_TOKEN=your_token
OPENAI_API_KEY=your_key
DATABASE_URL=postgres://user:pass@localhost:5432/marketbot
GOOGLE_CLIENT_ID=...
GOOGLE_CLIENT_SECRET=...
GOOGLE_REFRESH_TOKEN=...-
Setup local Postgresql database
-
Run prisma schema to setup your database
npx prisma migrate dev- Run Project
npm run dev