About

Research and comparisons for unified APIs covering HRIS, payroll, ATS, and benefits integrations.

Unified API Index is an informational publication focused on the infrastructure used to connect employment systems.

It publishes research at the publication level rather than under personal bylines. The methodology, cited sources, publication dates, and update dates are part of each research record.

The first area of coverage is unified HRIS and payroll APIs. ATS and benefits integrations remain within the publication's broader scope.