X448 is used at run time in 25 crates (of which 7 optionally). It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 2 crates (of which 1 directly).

Depender (with downloads and own rev deps) X448 version
87K 41 pgp optional ^0.6
cmail-rpgp ^0.6
vpgp ^0.6
2 libsumatracrypt-rs optional ^0.6.0
vru-noise dev ^0.6.0