generated: '2026-06-20'
method: searched
source: npm registry, PyPI, Maven Central, NuGet searches (2026-07-22)
description: >-
  First-party client libraries published by London Stock Exchange Group (LSEG)
  and its Refinitiv / Data & Analytics business. LSEG ships official data-access
  SDKs on PyPI, npm, Maven Central, and NuGet. No dedicated World-Check One
  client library is published to a public registry; World-Check One integrations
  use the REST API directly.
packages:
  - language: python
    registry: pypi
    name: lseg-data
    url: https://pypi.org/project/lseg-data/
    install: pip install lseg-data
    version: 2.1.1
    description: LSEG Data Library for Python - client for LSEG Data Platform APIs
    official: true
  - language: python
    registry: pypi
    name: refinitiv-data
    url: https://pypi.org/project/refinitiv-data/
    install: pip install refinitiv-data
    version: 1.6.2
    description: Refinitiv Data Library for Python (predecessor of lseg-data)
    official: true
  - language: python
    registry: pypi
    name: lseg-analytics-pricing
    url: https://pypi.org/project/lseg-analytics-pricing/
    install: pip install lseg-analytics-pricing
    version: 2.1.0
    description: LSEG Analytics (LFA) SDK for Python
    official: true
  - language: python
    registry: pypi
    name: eikon
    url: https://pypi.org/project/eikon/
    install: pip install eikon
    version: 1.1.18
    description: Legacy Eikon Data API Python package (superseded by lseg-data)
    official: true
    status: legacy
  - language: javascript
    registry: npm
    name: "@lsegroup/data"
    url: https://www.npmjs.com/package/@lsegroup/data
    install: npm install @lsegroup/data
    version: 1.0.0
    description: LSEG Data Library for TypeScript/JavaScript (maintained by lseg.com engineers)
    official: true
  - language: javascript
    registry: npm
    name: "@refinitiv-ui/elements"
    url: https://www.npmjs.com/package/@refinitiv-ui/elements
    install: npm install @refinitiv-ui/elements
    version: 7.15.6
    description: Element Framework (EF) web components for financial apps - see components/ artifact
    official: true
  - language: java
    registry: maven
    name: com.refinitiv.ema:ema
    url: https://central.sonatype.com/artifact/com.refinitiv.ema/ema
    install: 'implementation "com.refinitiv.ema:ema:3.8.3.0"'
    version: 3.8.3.0
    description: Enterprise Message API (EMA) - Real-Time SDK for Java
    official: true
  - language: csharp
    registry: nuget
    name: LSEG.Data
    url: https://www.nuget.org/packages/LSEG.Data
    install: dotnet add package LSEG.Data
    version: 2.2.3
    description: LSEG Data Library for .NET (owner LSEG)
    official: true
  - language: csharp
    registry: nuget
    name: LSEG.Ema.Core
    url: https://www.nuget.org/packages/LSEG.Ema.Core
    install: dotnet add package LSEG.Ema.Core
    version: 3.5.1.1
    description: Enterprise Message API (EMA) - Real-Time SDK for C# (owner LSEG)
    official: true
  - language: csharp
    registry: nuget
    name: LSEG.Eta.Core
    url: https://www.nuget.org/packages/LSEG.Eta.Core
    install: dotnet add package LSEG.Eta.Core
    version: 3.5.1.1
    description: Enterprise Transport API (ETA) - Real-Time SDK for C# (owner LSEG)
    official: true