Released October 8, 2025
ctxR is an open-source R Client package used to interact with the Computational Toxicology and Exposure (CTX) APIs in R. The CTX APIs were developed by the US EPA's Center for Computational Toxicology and Exposure, and provide users access in a programmatic manner to the data surfaced on the CompTox Chemicals Dashboard (CCD) and other data sources.
Before using the APIs, users need an individual API key to access. Please send an email to request a FREE API key.
ctxR includes several vignettes to get new users started with interacting with different endpoints of the CTX APIs. The API endpoints are organized into four data domains: Chemical API, Hazard API, Bioactivity API, and Exposure API. Currently, ctxR supports all four data domains and functions will continue to be developed as additional endpoints in existing or new organizational areas are released.
Updates
- 🐞Updated server address of API host from cloud.gov to new local sever throughout ctxR #72
- 🚀 Updated functions for CTX Exposure and Chemical endpoints #71
Full Changelog: v1.1.1...v1.1.3
Contributors
@rachmaninoffpk @carolinering @madison-feshuk
Emoji Legend
🚀 Feature - this is a new feature or improvement to the existing application
🧪 In Progress - a feature actively under development; may not yet be available in production
🐞 Bug - fixed an error in the current software
📄 Documentation - updated user/developer documentation
🔒 Security Updates - security related updates
🛠️ Developer Tools - updated internal tooling for a better developer experience