ark-secp256r1 is used at run time in 19 crates (of which 1 optionally). It is a direct run-time dependency in 5 crates. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) ark-secp256r1 version
21K 6 cairo-lang-runner ^0.4.0
7.2K 3 blockifier ^0.4.0
6.6K 3 fastcrypto ^0.4.0
4.6K cairo-native ^0.4.0
290 stealth_address_kit optional ^0.4.0
650 16 dock_crypto_utils dev ^0.4.0
2 kvac dev ^0.4.0