x25519-dalek-fiat is used at run time in 12 crates. It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps) x25519-dalek-fiat version
110 2 wireguard-keys ^0.1.0
1 diem-framework-crypto ^0.1.0
4 diem-crypto ^0.1.0