Runtime APIs

Substrate ships with the following runtime APIs:

• BlockBuilder: Provides the functionality required for building a block.
• TaggedTransactionQueue: Handles validating transactions in the transaction queue.
• OffchainWorkerApi: Handles offchain capabilities.
• AuraApi: Handles block authorship with Aura consensus.
• SessionKeys: Generates and decodes session keys.
• GrandpaApi: Integrates the GRANDPA finality gadget into the runtime.
• AccountNonceApi: Handles querying transaction indices.
• TransactionPaymentApi: Handles querying information about transactions.
• Benchmark: Provides a way to benchmark a FRAME runtime.

Learn more

• How to design your custom runtime APIs using the impl_runtime_apis macro