Display current/running eth gas transaction costs. Joined on April 14 knowing nothing about Crypto. Objective wasn't to win any prizes but just to learn some stuff and have fun. Didn't want to join a team due to my lack of experience. Tbh I didn't make anything too substantial but learned a lot coming from no real ethereum knowledge.

Eth Gas Recommender showcase

How it's made

Uses react (javascript) for the frontend, which uses web3j to connect to a locally running openethereum node to display some statistics about gas fees. It subscribes to all of the incoming transactions and adds it to the state to keep track, then converts between wei and the equivalent usd price.