Human Cell Atlas (HCA)

Base URL

https://service.azul.data.humancellatlas.org/

Auth

No auth required.

Key Endpoints

Endpoint	Description
`/index/projects?size={n}&catalog=dcp2`	List/search projects
`/index/samples?size={n}&catalog=dcp2`	List/search samples
`/index/files?size={n}&catalog=dcp2`	List/search files
`/index/summary?catalog=dcp2`	Summary statistics

Example Calls

# List projects
https://service.azul.data.humancellatlas.org/index/projects?size=5&catalog=dcp2

# Summary stats
https://service.azul.data.humancellatlas.org/index/summary?catalog=dcp2

Supports JSON filter parameters for organ, species, library construction, etc.

Response Format

JSON. hits array with project/sample/file metadata + pagination.

Rate Limits

No published limits. Be reasonable.