🔮 Coinbase Oracle Workshop 🔮

Prerequisites

• Coinbase Pro account: https://pro.coinbase.com/
• NodeJS latest version: https://nodejs.org/
• yarn / npm: https://classic.yarnpkg.com/en/docs/install/
• ganache-cli npm install -g ganache-cli

Steps

1. git clone https://github.com/compound-finance/open-oracle
2. cd open-oracle && yarn install
3. In a separate terminal run ganache-cli to start a local testnet
4. (back to the main terminal) Compile contracts yarn run compile
5. Deploy OpenOraclePriceData yarn run deploy OpenOraclePriceData. Remember the address of the deployed contract - we'll need it in the next step.
6. Deploy DelFiPrice contract yarn run deploy DelFiPrice "${OpenOraclePriceData address}" "0xfCEAdAFab14d46e20144F48824d0C09B1a03F2BC":array "0xfCEAdAFab14d46e20144F48824d0C09B1a03F2BC" "00". Remember the address of the deployed contract - we'll need it later. 0xfCEAdAFab14d46e20144F48824d0C09B1a03F2BC here is Coinbase Oracle public key.
7. Create Coinbase Pro API token
8. Post prices on-chain:
   1. Open a separate terminal, cd poster
   2. Assign the values from step #7 to environment variables:

   export API_PASSPHRASE=${your passphrase}
   export API_KEY_ID=${your key id}
   export API_SECRET=${your secret}
   

   3. yarn install (ignore the typings errors if any)
   4. Get deployed DelFiPrice contract from step #6 and a private key from the ganache-cli output
   5. yarn run start --view_address=${DelFiPrice address} --poster_key={ETH private key} --sources=https://api.pro.coinbase.com/oracle
9. Read on-chain prices:
   1. In the main terminal open saddle console yarn run console
   2. Get ETH price await delFiPrice.methods.medianPrice("ETH", ["0xfCEAdAFab14d46e20144F48824d0C09B1a03F2BC"]).call()
   3. Optionally repeat the posting step and check the updated price.

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