solana-system-transaction is used at run time in 11 crates (of which 2 optionally). It is a direct run-time dependency in 3 crates. It's used only as a dev dependency in 14 crates (of which 9 directly).

Depender (with downloads and own rev deps) solana-system-transaction version
313K 637 solana-sdk optional ^2.2.1
144K 26 solana-perf optional =2.2.1
36K 11 solana-faucet =2.2.1
145K 54 solana-rpc-client dev =2.2.1
88K 1 solana-transaction-metrics-tracker dev =2.2.1
31K 5 solana-cost-model dev =2.2.1
22K 10 solana-svm dev =2.2.1
21K 12 solana-runtime-transaction dev =2.2.1
11K 19 solana-entry dev =2.2.1
11K 9 solana-storage-bigtable dev =2.2.1
9.3K 8 solana-poh dev =2.2.1
6.7K 4 solana-unified-scheduler-pool dev =2.2.1