X448 is used at run time in 27 crates (of which 3 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
103K 39 pgp optional ^0.6
350 cmail-rpgp ^0.6
200 vpgp ^0.6
280 1 libsumatracrypt-rs optional ^0.6.0
vru-noise dev ^0.6.0