This tiny blockchain indexer scrapes Transfer events emitted by the USDC contract and saves the data in a file-based dataset in a local folder ./data. It is built with the Subsquid framework, hence the term "squid".
The squid uses @subsquid/file-store and @subsquid/file-store-json packages to store the dataset. It outputs its data in the JSONL format instead of the plain JSON array used by default.
Dependencies: NodeJS, Squid CLI.
To see it in action, spin up a processor, a process that ingests the data from the Ethereum Archive:
$ git clone https://github.com/subsquid-labs/file-store-json-example
$ cd file-store-json-example/
$ npm i
$ sqd processYou should see a ./data folder populated with indexer data appear in a bit:
$ tree ./data/
./data/
├── 0000000000-0007242369
│ └── transfers.jsonl
├── 0007242370-0007638609
│ └── transfers.jsonl
...
└── status.txt