gasz

Ethereum Gas Price Notifier @ gasz.in

Introduction

While interacting with Ethereum Network I had to frequently visit ethgasstation.info for checking current safeLow gas price to decide when I can send transaction, which was really eating a lot of my time.

So I started looking for some exisiting solutions which can give me Ethereum Gas Price feed, but couldn't find anything that satisfies my requirement. That's when I decided to write my own solution for getting notified when Ethereum Gas Price reaches a certain threshold.

After some exploration, I decided to build this application while leveraging PubSub model, because of 👇

• One module of gasz keeps fetching latest Ethereum Gas Price from ethgasstation.info [ gas-price-fetcher ]
• It also publishes latest gas prices to a Redis PubSub topic
• Another module accepts client request for gas price reaching certain threshold i.e. <= 50Gwei, over Websocket [ gas-price-notifier ]
• Client will subscribe to Redis PubSub topic & will receive notification over Websocket, when gas price reaches that value
• Single client can subscribe to multiple gas price feeds over same Websocket connection 🦾

This worked pretty well. After basic building block, I built a very minimalistic webUI for subscription/ unsubscription management & displaying browser based notification.

And here's gasz.

Usage

If you're a normal end user, I'm already running one instance of gasz @ gasz.in, where you can subscribe to receive gas price notification & you'll be notified when Ethereum Mainnet's Gas Price reaches certain threshold.

Note : Make sure you allow gasz.in to send notification(s)

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Browser Compatibility

It has been tested to be working fine on Firefox & Chrome. For enabling desktop notification on Chrome on MacOS, you'll most probably require to

• Visit chrome://flags
• Find Enable native notifications & disable it

Any modern browser supporting web Notification API, can be used to interact with gasz.

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Now you can set up when you want to receive notification

• When fast tx gas price satisfies criteria
  • Can get accepted < 2 mins
• When fastest tx gas price satisfies criteria
  • Can get accepted < 30 secs
• When average tx gas price satisfies criteria
  • Can get accepted < 5 mins
• When safeLow tx gas price satisfies criteria
  • Can get accepted < 30 mins

👆 criteria can be {<, >, <=, >=, ==} along with a gas price in Gwei unit.

Now you'll keep receiving notification until you acknowledge it by clicking on notification you're being shown.

Once you do 👆, you'll be unsubscribed from gas price notification feed.

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Developers

You might also be interested in programmatically accessing Ethereum Gas Price data feed, for that consider sending a subscription request for certain category of gas price satisfying certain criteria.

For example, let's say I'm waiting fastest tx gas price to go below 50 Gwei, I'll send a payload of form

{
    type: 'subscription',
    field: 'fastest',
    threshold: 50,
    operator: '<'
}

after connecting to wss://gasz.in/v1/subscribe.

Once gas price reaches that price, I'll receive response of form 👇, over websocket, where topic is useful for checking for which subscription you're receiving this feed, because same websocket connection can be used for subscribing to multiple feeds i.e. with multiple criterias.

👇 assumes you subscribed for fast gas price, when it reaches < 50 Gwei

txType can be any of {fast, fastest, average, safeLow}. And price is what you're interested in & it's in Gwei.

{
    txType: 'fast',
    price: 45,
    topic: 'fast : < 50'
}

Same websocket connection can be used for subscribing to gas prices of different categories.

You can consider doing a graceful unsubscription by sending

{
    type: 'unsubscription',
    field: 'fastest',
    threshold: 50,
    operator: '<'
}

to wss://gasz.in/v1/subscribe.

• type ∈ {subscription, unsubscription}
• field ∈ {fast, fastest, average, safeLow}
• threshold > 0 ( in Gwei )
• operator ∈ {<, >, <=, >=, ==}

Disclaimer

gasz.in doesn't ever hope to replace ethgasstation.info, rather it hopes to improve UX by adding support for real-time gas price notification API.

Thanks to creator(s)/ contributor(s)/ maintainer(s) of ethgasstation.info for such a great product 🙌

Contribution

Your help in improving gasz.in will be highly appreciated.