This is an easy to setup, lightweight indexer for Polkadot chains. It uses MongoDB to store data of blocks, extrinsics and events.

If you quickly need to retrieve and store data of Polkadot or one of its parachains, this indexer is for you.

Example of the data indexed for an extrinsic:

{
    _id: '21000002-2',
    isSigned: true,
    method: 'transferAllowDeath',
    assetId: null,
    era: {
        MortalEra: {
            period: '64',
            phase: '62'
        }
    },
    metadataHash: null,
    nonce: '427,799',
    signature: '0x86372deec59dc7902d5cc91684e8c6c451b861fddb4e87f004886aef937b9151eb9c04c90ce9005fa9737ab3aa5c153fe67edcaf77ee2d0df0a7d53a0f54e880',
    signer: {
        Id: '12xtAYsRUrmbniiWQqJtECiBQrMn8AypQcXhnQAc6RB6XkLW'
    },
    tip: '0',
    success: true,
    blockNumber: 21000002,
    blockHash: '0xd79b7267d5908bfe65968bc26d76fc01561caf99c4d81ed4db2e8d3ca0019806',
    timestamp: 1717081314000,
    args: {
        dest: {
            Id: '12yZvHnGeQBAG3H76VaraFhjJSdr9vuCKmkkZqotGXQNeqr7'
        },
        value: '1,000,000,000,000'
    },
    section: 'balances'
}

We provide a docker-compose.yml that sets up a MongoDB instance with a web interface and runs the indexer for Polkadot starting at block 21000000.

Simply run:
docker-compose up --attach indexer

Now you have the indexer up and running and you get a simple web interface to interact with the DB.

The Webapp will be available at http://localhost:8081

Blocks
Extrinsics
Events

Extrinsic Detail Example
Event Detail Example

You can now run any MongoDB Query against the database.
The webapp provides a simple form to perform queries. An example query for getting all transferAllowDeath extrinsics would be

{
    "method": "transferAllowDeath",
    "section": "balances"
}

You can play with the queries here

You can also easily access the the database directly from your code at mongodb://root:example@localhost:27017/, find an example in example.js. Simply run

npm install
node example.js

A mongo DB instance is required for this indexer to run. We recommend using a hosted DB cluster on Digital Ocean or similar. For quick testing, please use the Docker setup above, where a MongoDB instance is set up locally.

The following environment variables are required:

npm install
node index.js