SIMD-0127: Get-Sysvar Syscall

SIMD-0127 (Get-Sysvar Syscall) is a Core Standard Solana Improvement Document by Joe Caulfield (Anza); proposal status Activated.

Active on mainnet-beta since epoch 745; active on testnet since epoch 746; active on devnet since epoch 806.

Feature gates

• Feature gate: SIMD-0127: Enable syscall for fetching Sysvar bytes

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