ark-secp256r1 is used at run time in 19 crates (of which 2 optionally). It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) ark-secp256r1 version
23K 6 cairo-lang-runner ^0.4.0
5.8K 3 blockifier ^0.4.0
5.1K 3 fastcrypto ^0.4.0
stealth_address_kit optional ^0.4.0
410 16 dock_crypto_utils dev ^0.4.0
2 kvac dev ^0.4.0