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 15 crates (of which 9 directly).

Depender (with downloads and own rev deps) solana-system-transaction version
307K 659 solana-sdk optional ^2.2.1
130K 24 solana-perf optional =2.2.1
37K 9 solana-faucet =2.2.1
133K 56 solana-rpc-client dev =2.2.1
77K 1 solana-transaction-metrics-tracker dev =2.2.1
33K 5 solana-cost-model dev =2.2.1
26K 8 solana-svm dev =2.2.1
26K 10 solana-runtime-transaction dev =2.2.1
12K 18 solana-entry dev =2.2.1
11K 7 solana-storage-bigtable dev =2.2.1
9.9K 6 solana-poh dev =2.2.1
8.2K 4 solana-unified-scheduler-pool dev =2.2.1