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Atlas — geniusyield

Atlas is a Haskell library for building application backends for Plutus smart contracts on Cardano. It provides APIs for constructing transactions and balancing UTxOs, modular access to ledger-state data, and a test harness for unit and private-network integration tests.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Atlas — geniusyield — 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 Atlas when developing Haskell backend logic for Cardano Plutus contracts, especially when transaction construction, ledger-state queries and contract testing are part of the work.

Who it is for

  • Haskell developers building Cardano dApp backends.
  • Teams implementing off-chain transaction flows for Plutus smart contracts.
  • Developers who need configurable ledger data access or a contract-focused test harness.

Documented uses

  • Construct and balance transactions that interact with Plutus contracts.
  • Query ledger state using a local node, Cardano DB Sync or Maestro.
  • Write unit tests corresponding to on-chain behavior and integration tests against a Cardano node in a private network.
  • Reuse Haskell types and reduce duplication between on-chain and off-chain code.
Before you choose

Requirements & limits

The project repository is public and specifies the Apache-2.0 license.

  • Atlas is a Haskell developer library, not a hosted end-user dApp.
  • Applications can query data through a local node, Cardano DB Sync or Maestro, or a custom provider.
  • The testing options include unit tests and private-network integration tests against a Cardano node.
  • Haskell APIs support interoperability with Cardano and Plutus libraries and sharing types across on-chain and off-chain code.

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

Choose an Atlas ledger data provider

Identify a documented provider option for querying Cardano ledger state in an Atlas application.

Before you start

  • An Atlas application that needs ledger state information.

Steps

  1. Review Atlas’s modular data-provider options.

  2. Select among Maestro, a local node, Cardano DB Sync, or a custom provider.

Expected outcome

You have identified a documented data-provider option to explore for ledger-state queries.

Guide limitations

  • The repository overview names provider options but does not give configuration or connection steps.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
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Sources checked
13 October 2026
Original website title
geniusyield/atlas · Official homepage title · retained in its source language
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