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Architecture · easy

13. Sysvars: Clock, Rent, SlotHistory

Accessing cluster state on-chain.

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Sysvars are special cluster state accounts containing network metadata (Clock for timestamps/slots, Rent for rent calculations, EpochSchedule, StakeHistory). They can be accessed via syscalls or by passing their public keys.

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Check your understanding

1. Which sysvar provides the current Unix timestamp and slot number?
Clock sysvarRent sysvarEpochScheduleSlotHistory
2. Is querying a sysvar via sysvar::get() cheaper than passing the sysvar account?
Direct syscall (Clock::get()) uses fewer compute units than loading the sysvar accountPassing the account is always fasterThey have identical costSysvars cannot be fetched directly

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