# Developers

- [Core contracts](/developers/contracts.md): GYSR core contract reference
- [Deployment addresses](/developers/addresses.md): Core contract deployment addresses
- [Configuration](/developers/configuration.md): GYSR protocol global configuration
- [Interactions](/developers/interactions.md): Example calls directly to the GYSR core contracts
- [Error codes](/developers/error-codes.md): Core contract revert codes
- [Subgraph](/developers/subgraph.md): The GYSR subgraph