Alchemy: Build a dApp That Provides Real-Time Ethereum Transaction Notifications
Learn how to build a dApp that provides real-time Ethereum transaction notifications.
Last updated
Was this helpful?
Learn how to build a dApp that provides real-time Ethereum transaction notifications.
Last updated
Was this helpful?
Decentralized applications, known as dApps, are open-source applications developed using cryptocurrency and smart contracts, then deployed on a blockchain network.
In this tutorial, we’ll launch an example dApp built with Heroku on the Ethereum Testnet Rinkeby. Then, we’ll register our Rinkeby wallet address to opt-in to receiving transaction notifications, then we’ll send a transaction to test our app.
Read below to learn how to build a dApp that provides real-time Ethereum transaction notifications.
This tool is available on a Linux or macOS system.
Set up a credentials file for S3FS at ${HOME}/.passwd-s3fs. You will need to save your Filebase Access and Secret keys to this file and give it owner permissions. You can do so with the following commands:
echo ACCESS_KEY_ID:SECRET_ACCESS_KEY > ${HOME}/.passwd-s3fs
chmod 600 ${HOME}/.passwd-s3fs
You can mount a Filebase IPFS bucket with the command:
s3fs mybucket /path/to/mountpoint -o passwd_file=${HOME}/.passwd-s3fs -o url=https://s3.filebase.com
mybucket: name of your Filebase bucket
/path/to/mountpoint
Create a new folder for your project:
mkdir notifyTutorial
cd notifyTutorial
git clone https://github.com/alchemyplatform/Alchemy-Notify-Tutorial
cd Alchemy-Notify-Tutorial
heroku login
heroku create
Take note of the URL that is returned to the screen. It will be in the format:
https://salty-ridge-48849.herokuapp.com/
Chain: Ethereum
Network: Göerli
Webhook URL: Your Heroku URL from Step 7.
Ethereum Address: Your Ethereum Rinkeby Wallet Address
Then select ‘Create Webhook’.
Copy the webhook ID, we’ll use this in the next step.
server.js file in your working directory. Replace the following lines:In line 37, replace “webhook-id” with your webhook ID.
const body = { webhook_id: “webhook-id”, addresses_to_add: [new_address], addresses_to_remove: [] };
In line 43, replace “Alchemy-auth-key” with your Alchemy authentication token. You can view this token by selecting the ‘Auth Token’ button in the upper right corner of the dashboard.
headers: { 'X-Alchemy-Token': “Alchemy-auth-key”}
git add .
git commit -m "added Alchemy keys"
git push heroku master
This is the URL that is in the format https://salty-ridge-48849.herokuapp.com/
Your app will look like this:
Authorize the connection through the Metamask extension.
Your account address will be listed.
A prompt will confirm that notifications are enabled for your connected wallet address.
ACCESS_KEY_ID is your Filebase Access key, and SECRET_ACCESS_KEY is your Filebase Secret key. For more information on Filebase access keys, see .
If you don’t have an account, sign up for one .
