zmq2 is used at run time in 24 crates (of which 2 optionally). It is a direct run-time dependency in 5 crates. It's used only as a dev dependency in 2 crates (of which 1 directly).

Depender (with downloads and own rev deps) zmq2 version
6 lnp_rpc ^0.5.0
farcaster_node ^0.5.0
1 lnp_node ^0.5.0
360 26 internet2 optional ^0.5.0
240 20 microservices optional ^0.5
6.8K 6 zeromq dev ^0.5