X448 is used at run time in 23 crates (of which 2 optionally). It is a direct run-time dependency in 2 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
98K 35 pgp ^0.6
1 libsumatracrypt-rs optional ^0.6.0
vru-noise dev ^0.6.0