WKB is used at run time in 6 crates (of which 1 optionally). It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) WKB version
600 popgis ^0.7.1
kml2pgsql ^0.7.1
gpkg ^0.7.1
diesel-mysql-spatial ^0.7
gpkg-core ^0.7.1
1 ogcapi optional ^0.7.1