Zero is a decentralized protocol based on Liquity that allows RBTC holders to obtain maximum liquidity against their collateral without paying interest. After locking up RBTC as collateral in a smart contract and creating an individual position called a "Line of Credit" aka "Trove", the user can get instant liquidity by minting ZUSD, a USD-pegged stablecoin. Each Line of Credit is required to be collateralized at a minimum collateral ratio of 110%. Any owner of ZUSD can redeem their stablecoins for the underlying collateral at any time. The redemption mechanism and algorithmically adjusted fees guarantee a minimum stablecoin value of 1 USD.

An unprecedented liquidation mechanism based on incentivized stability pool deposits and a redistribution cycle from riskier to safer Lines of Credit provides stability at a much lower collateral ratio than current systems. Stability is maintained via economically-driven user interactions and arbitrage rather than by active governance or monetary interventions.

The Zero Subgraph is a fork of the Liquity subgraph.

Please note that this is still an early version of the subgraph. While it has undergone testing, we are aware there may be some bugs. If you wish to report a bug, please contact us on discord through the tech-support or user-feedback channels to let us know.

For more information on The Graph protocol, head to the Graph documentation here: https://thegraph.com/docs/.

To run locally:

• clone repo
• Run npm install
• Add a .env.dev file in the root of the project. Copy the contents of .env.example into this file (you can change the password to your own password if you wish)
• Run npm run prepare:RSK:testnet. This will create the docker-compose.yml file and the subgraph.yaml file from the template files.
• Run npm run dev:up. This will run docker compose up -d and pass in your environment file.
• Run npm run codegen. This will generate the ./generated folder with types and contract objects.
• Run npm run build to generate the build folder
• Run npm run create-local to start running the graph node locally
• Run npm run deploy-local to deploy the contents of the build folder locally
• Go to http://localhost:8000/subgraphs/name/DistributedCollective/sovryn-subgraph/graphql to see the iGraphQL GUI for your local subgraph

• The subgraph mappings files are written in AssemblyScript, not Typescript. AssemblyScript docs can be found here: https://www.assemblyscript.org/. Pay particular attention to the difference in the equality operator - === compares referencess, == compares values.
• If you are having issues with postgres, try deleting the data/ directory from the subgraph root