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ctxR was developed to streamline the process of accessing theinformation available through theComputational Toxicology and Exposure(CTX)APIswithout requiring prior knowledge of how to use APIs. Chemical, hazard,bioactivity, and exposure data in available from the CTX APIs. Most datais also available on theCompTox Chemical Dashboard(CCD) or within otherComputational Toxicology and Exposure OnlineResources.

If you are interested in contributing or want to report a bug, pleasesubmit a issue or start a discussion. SeeCONTRIBUTINGfor more information.

To install the current development version, run the following command:

devtools::install_github("USEPA/ctxR")

Users don’t need a API key to install ctxR, but will need to supply anAPI key to use ctxR and access data. AFREE API key can be obtained byemailing theCTX API Admins.

If you usectxR in publishedresearch, please cite the following paper:

Kruse, PM, Ring, CL, Paul Friedman, K, Feshuk, M, Brown, J, Thunes, C, &Rashid, A. (2025). ctxR: Utilities for interacting with the CTX APIs.NAM Journal, 100031. doi:10.1016/j.namjnl.2025.100031

The United States Environmental Protection Agency (EPA) GitHub projectcode is provided on an “as is” basis and the user assumes responsibilityfor its use. EPA has relinquished control of the information and nolonger has responsibility to protect the integrity, confidentiality, oravailability of the information. Any reference to specific commercialproducts, processes, or services by service mark, trademark,manufacturer, or otherwise, does not constitute or imply theirendorsement, recommendation or favoring by EPA. The EPA seal and logoshall not be used in any manner to imply endorsement of any commercialproduct or activity by EPA or the United States Government.