solana-keypair is used at run time in 230 crates (of which 43 optionally). It is a direct run-time dependency in 43 crates. It's used only as a dev dependency in 37 crates (of which 9 directly).

Depender (with downloads and own rev deps) solana-keypair version
111K 13 solana-connection-cache =2.2.1
111K 11 solana-quic-client =2.2.1
111K 3 solana-thin-client =2.2.1
111K 3 solana-udp-client =2.2.1
109K 30 solana-streamer =2.2.1
108K 268 solana-client =2.2.1
103K 40 solana-transaction ^2.2.1
98K 5 solana-client-traits ^2.2.1
98K 6 solana-quic-definitions ^2.2.1
97K 4 solana-genesis-config ^2.2.1
96K 40 solana-vote-program =2.2.1
95K 12 solana-system-transaction ^2.2.1
280K 679 solana-sdk optional ^2.2.1
77K 47 solana-clap-utils =2.2.1
111K 26 solana-perf optional =2.2.1
28K 11 solana-faucet =2.2.1
27K 5 solana-tls-utils =2.2.1
14K 10 solana-clap-v3-utils =2.2.1
2.7K 4 litesvm ^2.2
1.6K 3 solana-cli =2.2.1
1.6K 1 solana-tps-client =2.2.1
1.2K solana-keygen =2.2.1
1.0K agave-install =2.2.1
1.0K agave-cargo-registry =2.2.1
950 solana-tpu-client-next =2.2.1
340 1 txtx-addon-network-svm-types ^2.2.1
190 litesvm-token ^2.2
120 litesvm-loader ^2.2
solana-keyconv ^2.2.1
439K 80 spl-token-2022 dev ^2.2.1
175K 8 solana-zk-token-sdk dev =2.2.1
135K 15 solana-config-program dev =2.2.1
115K 54 solana-rpc-client dev =2.2.1
111K 3 solana-rpc-client-nonce-utils dev =2.2.1
101K 7 solana-ed25519-program dev ^2.2.1
101K 7 solana-secp256k1-program dev ^2.2.1
95K 3 solana-offchain-message dev ^2.2.1
95K 5 solana-presigner dev ^2.2.1
90K 13 solana-zk-sdk dev =2.2.1
80K 7 solana-vote dev =2.2.1
58K 1 solana-transaction-metrics-tracker dev =2.2.1
29K 5 solana-cost-model dev =2.2.1
20K 10 solana-svm dev =2.2.1
19K 12 solana-runtime-transaction dev =2.2.1
19K 3 agave-transaction-view dev =2.2.1
15K 27 solana-cli-output dev =2.2.1
12K 6 solana-compute-budget-instruction dev =2.2.1
10K 19 solana-entry dev =2.2.1
10K 9 solana-storage-bigtable dev =2.2.1
8.5K 8 solana-poh dev =2.2.1
6.9K 4 solana-unified-scheduler-pool dev =2.2.1
6.6K 1 solana-wen-restart dev =2.2.1