The NASA Exoplanet Archive is an astronomical exoplanet and stellar data service and online catalog that collates and cross-correlates astronomical data on exoplanets and their host stars. The archive is astronomer vetted and provides tools to work with this data.
The NASA Exoplanet Archive API provides developer access to search queries. The API is accessed through HTTP calls acting as SQL SELECT statements, where calls specify data to be selected from a particular table. Default data format is CSV, but several astronomy table formats may be specified.