SellSage is a Discord bot which helps cryptocurrency investors manage their exit strategies. Unlike simple price alert bots, SellSage manages sophisticated exit plans for the investor, including considerations such as cost basis and percentage based sell targets, and alerts them when the specified sell targets are met. This makes life easier for investors because they no longer have to constantly watch prices or pull up spreadsheets to figure out when or how much of their holdings to sell. Simply tell SellSage the details of your exit plan and enjoy being able to relax while you wait for the notifications.
This project is built with Node.js, Typescript, and SQLite.
Pull the repo and install dependencies using npm install.
Setup a .env file in the base directory with
DISCORD_APP_ID- Discord Developer Portal -> General Information -> Application IDDISCORD_BOT_TOKEN- Discord Developer Portal -> Application -> Bot -> TokenCOINGEKKO_API_KEY- CoinGekko Developer Portal -> My API Keys
You should be able to set everything up for development for free - at the time of writing this CoinGekko has a demo tier for their API. I opted to host on Railway.
You can setup the database for development using npm run init-db-dev. There are also extra utility functions / npm scripts to help manage the database in src/database.
As is, adding support for additional unique (see Scaling SellSage -> Database) tickers is trivial. Simply add to the SUPPORTED_TICKERS constant and re-run the seed.ts database script. If your database is already set up, you might have to run wipe.ts first to avoid conflicts or better yet create a script that only wipes the crypto table.
Discord slash commands are defined in the src/commands/register.ts script. You can use npm run register-discord-commands to push / sync the commands.
Once the steps above are complete, simply use npm run dev to start the development server.
Start a DM with your bot and use /help to see all commands and descriptions at once.
This project was created quickly to accomplish the minimum functionality needed for myself and a handful of friends. If you're interested in scaling this to thousands of users, below are a couple important things you will need to improve.
I designed the crypto table with unique symbols for MVP simplicity. This won't do if you want this to scale to thousands of coins on hundreds of networks as symbol uniqueness is not guaranteed. You will also inevitably need a better database solution to handle increased concurrency.
The cron job which watches price changes in the market is set up to run every 5 minutes in order to stay under the demo tier limits of the CoinGekko API. If you want to scale with a premium account, you can update the frequency of the job in src/cron/watcher.ts.