Kuber

Haskell library and API server to query Crdano Node, Transaction balancing with deterministic Utxo selection

Key Features

• Chain Queries — UTxO filtering by address/TxId, protocol & genesis parameters, time/slot conversion
• Transaction Composition — JSON-driven builder with automatic fee balancing, multi-sig, Plutus scripts, collateral management, native tokens & NFTs
• Transaction Submit — Cardano submit api compatible endpoint POST /api/submit/tx
• Layer 2 Integration — Full Hydra lifecycle (init, commit, decommit, close, contest, fanout) with simultaneous L1/L2 operations
• Developer Experience — Unified REST & WebSocket API via kuber-client, type-safe Haskell library, interactive IDE with Plutus compilation

Getting Started

Kuber client provides same interface for cardano network and layer2 hydra network.

• Kuber API Reference.
• Transaction Bulder and Ide reference
• kuber-client library

Run Kuber-Server with docker-compose

Kuber can be started easily with the docker-compose.yml file. The official Docker images are available on GitHub Container Registry (GHCR): ghcr.io/dquadrant/kuber.

Note: You will have to wait for the cardano-node to sync to the latest block.

git clone https://github.com/dquadrant/kuber.git
# Use the latest stable version
docker-compose up -d

If you want to build docker image locally, you can use the helper script

$ ./.ci/build

Hydra

Kuber fully supports hydra transaction building and lifecycle. With kuber-hydra, you can interact simultaneously with the layer1 in addition to hydra.

• Get Started: Hydra docs
• Source code: kuber-hydra

IDE

Official IDE with Plutus compilation support is available at kuberide.com/ide

Developer guide

• Example Project : cardano-marketplace
• Kuber Haskel Library

Instructions for local development of kuber is available in DEVELOPER.md