Contracts

🛢️ GweiPump

Chainlink Pricefeeds

-ETH/USD converted to on WTI/USD

Chainlink Node GET Request uint

Yahoo Finance Cruide Oil Futures Price:

https://query1.finance.yahoo.com/v8/finance/chart/CL=F

-Allow user to overpay for oil, then refund them if price changes while their payment is stuck in the mempool

-Converting 1 barrel price 40 milliliters [1 US bbl oil= 158987.29mL]: https://www.metric-conversions.org/volume/us-oil-barrels-to-milliliters.htm 1 US BBL = 158987.29 mL => WtiConvert140mL() = (40.00 mL * getLatesWtiUsd() ) / 158987.29 mL = ( (4000*getLatesWtiUsd() ) / 15898729 )

Chainlink Keepers

-Chainlink Keepers updates WTI/USD based timer on 1 day timer and if contract has >= 0.01 LINK [LinkRiver node request fee] )

Chainlink Keepers Log Dashboard:

https://automation.chain.link/

🍸 Vocktails

Chainlink VRFv2

Get random drinks from robotics pump with Chainlink VRFv2.

Vocktails VRFv2 Dashboard:

https://vrf.chain.link/

📷 Slide Presentation

https://docs.google.com/presentation/d/1En3P14oi3CUcIWOaYxlzi5li4qDtajm3q3V0JpJfAYk/edit?usp=sharing

🔴 Chainlink Universal Adapter Request: Node.js Puppeteer XPATH Web Scrape (offline) 🔴

WTI/USD on Chainlink website: https://data.chain.link/ethereum/mainnet/commodities/wti-usd

Chainlink website XPATH: /html/body/div[1]/main/section[2]/div[1]/div[1]/div[2]/p

⚠️

Puppeteer having trouble reading from XPATH [use the above working link instead]:

Value on Etherscan on this page: https://etherscan.io/address/0xf3584f4dd3b467e73c2339efd008665a70a4185c#readContract

Etherscan XPATH: /html/body/div[4]/div[8]/div[2]/div/form/div

⚠️

Foundry

⚠️ Note: you might need to add libraries in forge with remappings.txt ⚠️

Install Chainlink libraries

forge install smartcontractkit/chainlink-brownie-contracts --no-commit

Install Solmate Library

forge install rari-capital/solmate --no-commit

Deploy and verify contract

forge create src/GweiPump.sol:GweiPump \
--private-key $devTestnetPrivateKey \
--rpc-url $baseSepoliaHTTPS \
--etherscan-api-key $basescanApiKey \
--verify