Uniswap Price Fetcher

This project is a simple Node.js application that fetches the USDT price of a specified token on the Binance Smart Chain (BSC), using a decentralized exchange (DEX) interface similar to Uniswap, such as PancakeSwap. It's structured in three layers: API, Service, and Blockchain Interaction, to cleanly separate concerns and enhance maintainability.

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Prerequisites

Before you begin, ensure you have the following installed:

. Node.js (version 12.x or higher recommended) . npm (normally comes with Node.js) . Access to a BSC node or use a service like Binance Smart Chain (BSC) DataSeed

Installation

Clone the repository to your local machine:

Running the Server

Start the server by running:

node api.js

The server will start, and you can fetch token prices by accessing http://localhost:3000/price/{TOKEN_SYMBOL} through a web browser or a tool like curl or Postman.

Usage Example

http://localhost:3000/price/BTC

This will return the current USDT price of BTC on the configured DEX in JSON format, like so:

{ "symbol": "BTC", "price": "12345.67" }

Built With

Node.js - The runtime environment Express - The web framework used Web3.js - Ethereum JavaScript API @pancakeswap-libs/sdk - PancakeSwap SDK for interacting with the DEX