Callisto (formerly BDJuno) is the official Juno implementation for Big Dipper, the open-source block explorer for Cosmos
Last updated May 14, 2026
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Callisto
Callisto (formerly BDJuno) is the Juno implementation for Big Dipper.
It extends the custom Juno behavior by adding different handlers and custom operations to make it easier for Big Dipper showing the data inside the UI.
All the chains' data that are queried from the RPC and gRPC endpoints are stored inside a PostgreSQL database on top of which GraphQL APIs can then be created using Hasura.
Usage
To know how to setup and run Callisto, please refer to the docs website.Testing
If you want to test the code, you can do so by running$ make test-unitNote: Requires Docker.
This will:
- Create a Docker container running a PostgreSQL database.
- Run all the tests using that database as support.
