addchain is used at run time in 144 crates (of which 39 optionally). It is a direct run-time dependency in 4 crates. It's used only as a dev dependency in 10 crates.

Depender (with downloads and own rev deps) addchain version
205K 1 ff_derive ^0.2
5.7K 2 rescue_poseidon ^0.2
2.8K 1 rustcrypto-ff_derive ^0.2
1 ff_derive_wasm_unknown_unknown ^0.2