h3-datagram is used at run time in 5 crates (of which 3 optionally). It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps) h3-datagram version
34K 21 h3-quinn optional ^0.0.1
2.1K 1 salvo-http3 ^0.0.1
330 h3-webtransport ^0.0.1