This is the CAT20 Token marketplace on the Fractal Bitcoin Network, where users can list their CAT20 tokens, and buyers can purchase or place orders for CAT20 tokens. Transactions are executed automatically.

To create a CAT20 Token marketplace using Node.js with TypeScript on the Fractal Bitcoin Network, you'll need to focus on several core components: creating endpoints for listing and purchasing tokens, and handling transactions with the CAT protocol. Here's a structured guide for building this project.

• Organize your project with the following structure:

  cat20-token-marketplace/
  ├── src/
  │   ├── server.ts
  │   ├── routes/ 
  │   ├── controllers/ 
  │   ├── models/
  │   └── utils/
  ├── dist/
  ├── package.json
  └── tsconfig.json
  

This structure helps maintain clean separation of concerns, making the codebase easier to manage.

1. Express Server Setup: In src/server.ts, set up your Express server:

   import express from 'express';
   const app = express();
   const port = 3000;
   
   app.use(express.json());
   
   app.listen(port, () => {
     console.log(`Server is running on http://localhost:${port}`);
   });

2. Market Model:

   Create src/models/tokenModel.ts to define the Token schema:

   import mongoose, { Document, Schema } from 'mongoose';
   
   interface IToken extends Document {
     name: string;
     symbol: string;
     price: number;
     available: boolean;
   }
   
   const TokenSchema: Schema = new Schema({
     name: { type: String, required: true },
     symbol: { type: String, required: true },
     price: { type: Number, required: true },
     available: { type: Boolean, default: true },
   });
   
   export default mongoose.model<IToken>('Token', TokenSchema);

3. Routes and Controllers:

   • In src/routes/tokenRoutes.ts, define routes for listing and purchasing tokens:

     import { Router } from 'express';
     import { listTokens, purchaseToken } from '../controllers/tokenController';
     
     const router = Router();
     
     router.get('/tokens', listTokens);
     router.post('/tokens/:id/purchase', purchaseToken);
     
     export default router;

   • In src/controllers/tokenController.ts, implement the logic for interacting with these endpoints:

     import { Request, Response } from 'express';
     
     let tokens: Token[] = [...];
     
     export const listTokens = (req: Request, res: Response) => {
       res.json(tokens.filter(token => token.available));
     };
     
     export const purchaseToken = (req: Request, res: Response) => {
       const tokenId = req.params.id;
       const token = tokens.find(t => t.id === tokenId && t.available);
       if (token) {
         token.available = false;
         res.send(`Token ${token.name} purchased successfully.`);
       } else {
         res.status(404).send('Token not found or already sold.');
       }
     };

4. Handling Transactions: Implement functions in src/utils/transactions.ts to handle blockchain interactions, such as minting, transferring, and executing CAT20 transactions using the tracker service and CLI tool provided by the CAT20 protocol.

   import { execSync } from 'child_process';
   
   export const executeTransaction = (args: string) => {
     const command = `cli-exec-command ${args}`;
     return execSync(command).toString();
   };

• Use the following commands to build and run your project:

  yarn build
  npm start

• The build script should compile your TypeScript code, and start will run the transpiled JavaScript.

• Verify your endpoints by sending HTTP requests using Postman. Set up a new request for listing tokens with the endpoint GET http://localhost:3000/tokens and for purchasing with POST http://localhost:3000/tokens/:id/purchase.

This setup provides a comprehensive foundation for your CAT20 Token marketplace and handles the core functionalities needed in such an application. For more detailed usage and testing of components like JWT authentication or integrating additional middleware, refer to concepts discussed in additional resources.

I just published essential code part to construct cat20 token marketplace for fractal bitcoin network.

If you have technical support, need development inquiries, please contact me.

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