curve25519-dalek-fiat is used at run time in 8 crates (3 directly).

Depender (with downloads and own rev deps) curve25519-dalek-fiat version
12K 1 x25519-dalek-fiat ^0.1.0
12K 1 ed25519-dalek-fiat ^0.1.0
4 diem-crypto ^0.1.0