Your Project Manifest File

The Project Manifest file is an entry point to your project. It defines most of the details on how SubQuery will index and transform the chain data.

For Polkadot, there are three types of mapping handlers (and you can have more than one in each project):

• BlockHanders: On each and every block, run a mapping function
• EventHandlers: On each and every Event that matches optional filter criteria, run a mapping function
• CallHanders: On each and every extrinsic call that matches optional filter criteria, run a mapping function

Note that the manifest file has already been set up correctly and doesn’t require significant changes, but you need to change the datasource handlers. This section lists the triggers that look for on the blockchain to start indexing.

Your Project Manifest File

The Project Manifest file is an entry point to your project. It defines most of the details on how SubQuery will index and transform the chain data.

For Polkadot, there are three types of mapping handlers (and you can have more than one in each project):

• BlockHanders: On each and every block, run a mapping function
• EventHandlers: On each and every Event that matches optional filter criteria, run a mapping function
• CallHanders: On each and every extrinsic call that matches optional filter criteria, run a mapping function

Note that the manifest file has already been set up correctly and doesn’t require significant changes, but you need to change the datasource handlers. This section lists the triggers that look for on the blockchain to start indexing.