ark-bls12-381-ext is used at run time in 12 crates (of which 6 optionally). It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps) ark-bls12-381-ext version
40K 6 sp-crypto-ec-utils optional ^0.4.1
sp-ark-bls12-381 ^0.4.1
gp-crypto-ec-utils optional ^0.4.1