Frontend Implementation

• Visit https://github.com/Linch1/Web3TokenChartingDemo to check a frontend implementation of this repo

Intro

How does this work? The price scraper listens for the latest swap made to blockchain, based on the token's liquidity pair reserves you can calculate the tokens prices, the router of the swap and the pair of the tokens.

Warning To run this script in a production enviroment you cannot use the free provider that is used inside this repo. You must buy a professional bsc provider, or build your own node. I made an estimation that this script will make at least 350.000.000 + requests monthly, so consider this when you search for the provider to buy. I'm personally using Getblock fullnode.

Emprove This If you know a more efficent way, or any other better than this please let the community know this by opening an issue with infos about your ideas! ❤️ . This repo can be used not only with pancakeswap but also with any kind of other exchange platform on any chain that is similar to pancakeswap.

Setup

• Install mongodb sudo apt install -y mongodb
• Install nodejs sudo apt install nodejs
• Install npm sudo apt install npm
• Download the repo
• Navigate to the repo from the termian cd /path/to/tokenChartingRepo
• clone the .env.exapmple file to .env
• populate the file .env ( especially with a bsc/eth/polygon/.. provider that support a relevant amount of requests )
• Install the repo dependencies npm i
• Run the scraper npm run scraper and left it run
• Run the server on another terminal npm run server

Query the prices

• Inside the repo you can find a rest api built with expressjs that you can use to query the scraped prices
• Run the server with npm run server

Endpoints

• GET. /token/price/:contract : Retrun the token price
• GET. /token/history/:contract?from=<>&to=<>: Return the history of the token in the specified time range ( use unix timestaps to specify the time ranges )
• there are more endpoints not documented yet

ISSUES

• Currently the scraper has a memory leak. After some hours that it runs then it crashes, I'm trying to figure out where is this leak. If anyone can find it then report it or make a pull request.