Base64-URL is used at run time in 46 crates (of which 15 optionally, 6 directly). It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) Base64-URL version
15K 20 nats ^1.4.10
270 3 short-crypt ^1.4
140 cddl optional ^1.4.10
1 ddoresolver-rs ^1.4.9
1 didcomm-rs ^1.4.9
jwtvoid ^1.4.10