This NodeJS app uses whale-alert.io's API to fetch the latest whale transactions. I call it poor man's whale alert.
For free accounts whale-alert.io's API is very limited, only allows 10 api calls per minute or 1 api call per 6 seconds. And only returns the transactions that has a value of greater than 500k USD.
But, then I found their bot's twitter account. It tweets everytime a large transaction happens. And inside the tweet, there is a link to their website that shows the entire transaction details.
It's url looks something like this
https://whale-alert.io/transaction/ethereum/ae8a491532d1862c6c5f05fd48d704425d3ec77d413d31dd75b941379be53dc1
and all we need to do is to extract the following part from the above url
/transaction/ethereum/ae8a491532d1862c6c5f05fd48d704425d3ec77d413d31dd75b941379be53dc1
and add https://api.whale-alert.io/v1 to the front then add ?api_key=YOUR_WHALE_ALERT_API_KEY_HERE to the end.
Then it will look something like this
https://api.whale-alert.io/v1/transaction/ethereum/ae8a491532d1862c6c5f05fd48d704425d3ec77d413d31dd75b941379be53dc1?api_key=YOUR_WHALE_ALERT_API_KEY_HERE
This url will return the JSON formatted data of the transaction that was tweeted by whale-alert's bot.
But why? you may ask. Well, this evades their 500k USD transaction limit.
goto keys.js and add your twitter's consumer_key, consumer_secret, access_token_key and access_token_secret, then add, your whale-alert.io's api key at whale_alert_api_key and finally add your MongoURI.
Once you do this, run npm install and then run npm start to start the server.
Host the code on AWS or Digital Ocean or Heroku.
Then, you can get the transaction's JSON data from /api/v1/get route.
You can update the data from /api/v1/update route.
This will delete all the existing data on MongoDB server and update with new data. I never used Redis and I think it will be the best option in this case. If you've worked with Redis in the past then feel free remove the MongoDB dependency and add Redis('s?) code and submit a pull request. I'll verify merge it.
Once you host the code on a server, create an account on https://testuptime.com/ and add /api/v1/update route to it. And ping your website from there with a simple http request. This will update the data every single minute by extracting the latest tweet from whale_alert bot. This will also ensure that we are not crossing the API's rate limit. I don't know if it's feasible to do this on the server side itself. If yes, create a pull request and I'll merge it.
Once you do this, you can use /api/v1/get route to fetch latest transaction details for Android or IOS apps or your website.
Feel free to fork and contribute to this repo.
What it needs now?
- Redis instead of MongoDB? does it even work?
- Remove testuptime.com's dependency?