Build Canonical Contracts Overview of the canonical contracts available on Moonbeam, Moonriver, & Moonbase Alpha, including common-good contracts and precompiles. Ethereum API Learn how to use the Ethereum API when developing on Moonbeam. This section includes guides on Ethereum libraries, development environments, and more. Substrate API Learn how to interact with the Substrate API when developing on Moonbeam, including how to use the Polkadot.js API for querying Moonbeam data. Moonbeam Custom API This page contains information on Moonbeam custom API endpoints (JSON-RPC methods specific to Moonbeam).