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Kleros V2

Kleros V2 is an Ethereum-oriented arbitration protocol built around smart contracts, with a court frontend, developer libraries, an indexing layer and bots for on-chain contract upkeep.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Kleros V2 — OpenViST project profile in Protocols.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use Kleros V2 when a project needs an on-chain arbitration protocol, a developer path for connecting arbitrable applications, or tooling for court participation, indexed data or contract upkeep.

Who it is for

  • Developers building arbitrable applications that interact with the protocol’s arbitrator.
  • Jurors and parties using the court frontend for disputes.
  • Operators contributing to smart-contract upkeep by running the project’s bots.
  • Developers building tools around indexed protocol data.

Documented uses

  • Integrate an application with Kleros arbitration and display dispute and evidence information.
  • Provide a web court interface for jurors and dispute parties.
  • Index protocol data through the subgraph layer for application or analytics use.
  • Automate on-chain contract upkeep with project bots.
Before you choose

Requirements & limits

The source repository is public and specifies an MIT license. The README documents Node.js 16, Yarn, Volta and Docker Desktop for contributing and local development; the local-stack shortcut additionally lists tmux, curl, jq and lsof.

  • The repository separates contracts, court frontend, SDK, shared React utilities, subgraph and bots into distinct packages.
  • The SDK supports arbitrator interactions and rendering dispute and evidence information.
  • The upkeep bots require spending gas to contribute to upkeep operations.
  • The documented local full-stack workflow includes a Hardhat node and local graph node, so local development requires additional infrastructure beyond the web frontend.

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

Prepare the Kleros v2 repository dependencies

Install the documented development prerequisites and repository dependencies.

Before you start

  • Node.js 16
  • Yarn 1.22, upgraded to Yarn 3
  • Volta
  • Docker Desktop
  • jq and yq

Steps

  1. Install Node.js 16 and Yarn 1.22 using the instructions for your operating system.

  2. Upgrade Yarn to version 3 with yarn set version berry.

  3. Install Volta, Docker Desktop, jq, and yq.

  4. From the repository’s top-level directory, run yarn install.

  5. Initialize the Foundry libraries with the command below.

    Documented command
    git submodule update --init --recursive -j 4

Expected outcome

The documented prerequisites and repository dependencies are installed, including the Foundry submodules.

Guide limitations

  • Docker Desktop is listed for running the local graph node; this recipe does not start or deploy the application.
  • The repository also documents a separate full-stack local deployment stage.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
9 October 2026
Original website title
kleros/kleros-v2 · Official homepage title · retained in its source language
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