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Cardano Client Lib

Cardano Client Lib is an open-source Java library for integrating Cardano blockchain interactions into Java applications. It is divided into modules and offers backend integrations including Blockfrost, Koios, and Ogmios/Kupo.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Cardano Client Lib — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when developing Java software that needs Cardano client functionality and you want to integrate a listed backend provider rather than build those client integrations from scratch.

Who it is for

  • Java developers adding Cardano functionality to an application.
  • Teams choosing a backend provider for Cardano data and transaction services.

Documented uses

  • Create Cardano mainnet or testnet account objects and retrieve addresses or mnemonics.
  • Configure a backend service and access documented services for transactions, fees, blocks, assets, UTXOs, metadata, epochs, and addresses.
  • Build ADA payment transactions with metadata using the QuickTx example.
  • Explore examples and tutorials for transfers, native-script multisignature transfers, and governance APIs.
Before you choose

Requirements & limits

The repository identifies the library as open source under the MIT license.

  • Java version depends on the release line: the README lists Java 11 or later for 0.7.x and 0.6.x, and Java 17 or later for master.
  • The top-level cardano-client-lib module includes the other library modules except backend-provider modules; a backend module must be selected separately.
  • The README identifies 0.7.2 as the latest stable version and 0.8.0-pre4 as a preview in the provided documentation.
  • The project notes that some APIs referenced in older posts are deprecated, so consult current documentation for API details.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Configure a Cardano backend service in a Java application

Create a Blockfrost or Koios backend service and obtain the library’s service interfaces.

Before you start

  • A Java application using Cardano Client Lib.
  • For Blockfrost, a testnet project ID; the example uses the library’s testnet URL constant.

Steps

  1. Choose the Blockfrost or Koios backend provider.

  2. Instantiate BFBackendService with Constants.BLOCKFROST_TESTNET_URL and your Blockfrost project ID, or instantiate KoiosBackendService with KOIOS_TESTNET_URL.

  3. Call the backend service’s getters to obtain services such as fee calculation, transaction, block, asset, UTxO, metadata, epoch, and address services.

Expected outcome

A backend service instance is configured, with the listed service interfaces available from it.

Guide limitations

  • The source shows service construction and getters, but does not document dependency declarations, credentials beyond the Blockfrost project ID, or subsequent service operations.
  • The shown Blockfrost URL and Koios URL are testnet examples.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
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11 October 2026
Original website title
bloxbean/cardano-client-lib · Official homepage title · retained in its source language
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