Data indexing service

Because there's no server, every data of a DApp will be stored on blockchain. And keeping track of all those datas is too complicated if getting data directly from blockchain.

To solve this, DApp's developers need to use a data indexing service, such as The Graph.

The Graph is a decentralized protocol for indexing and querying data from blockchains, starting with Ethereum. It makes it possible to query data that is difficult to query directly. Luckily, The Graph open-sourced their source code and build a Docker image so that every developers can run their own graph on any EVM-compatible network.

To start running your graph node:

1. Download the docker-compose.yml file from The Graph's public repo.

2. Edit ethereum field to mainnet:https://rpc.kardiachain.io

3. Run docker-compose up -d

After that, a GraphQL playground will be served on port 8000.