solana-loader-v3-interface is used at run time in 97 crates (of which 2 optionally). It is a direct run-time dependency in 8 crates. It's used only as a dev dependency in 27 crates.

Depender (with downloads and own rev deps) solana-loader-v3-interface version
298K 596 solana-program ^3.0.0
36K 22 solana-bpf-loader-program =3.0.0
37K 5 solana-loader-v4-program =3.0.0
2.0K 4 litesvm ^3.0
1.4K 2 solana-cli =3.0.0
900 5 mollusk-svm ^3.0
170 litesvm-loader ^3.0
35K 61 solana-runtime dev =3.0.0