# ICOS zarr proxy > Atmosphere / ecosystem / ocean environmental datasets served as Zarr v2 over HTTP. Each store is self-describing and mints a data passport on access. ## Start here - Service discovery (JSON, lists stores + per-store agent_guide URLs): https://fluxnet-shuttle-zarr-rc.fs4vm.icos-cp.eu/ - API contract: https://fluxnet-shuttle-zarr-rc.fs4vm.icos-cp.eu/openapi.json - REST query (bbox/time/QC filter → NDJSON or Arrow, and csv and ndjson for clients without pyarrow): https://fluxnet-shuttle-zarr-rc.fs4vm.icos-cp.eu/query - Variable catalogue: https://fluxnet-shuttle-zarr-rc.fs4vm.icos-cp.eu/variables ## Datasets - fluxnet-shuttle.zarr: open `xarray.open_zarr('https://fluxnet-shuttle-zarr-rc.fs4vm.icos-cp.eu/fluxnet-shuttle.zarr', group='_combined/fluxnet_dd', consolidated=True)` · views: _combined/fluxnet_dd, _combined/fluxnet_ww, _combined/fluxnet_mm, _combined/fluxnet_yy · guide https://fluxnet-shuttle-zarr-rc.fs4vm.icos-cp.eu/fluxnet-shuttle.zarr/agent_guide