SIMD-0186
Fee-Only Transaction Semantics
Defines fee-only semantics: transactions that fail account loading still pay their fee, deterministically.
Fee-Only Transaction Semantics is active on Solana mainnet since epoch 1008 — activated 5 weeks ago.
- mainnet
- active since epoch 1008 · 5 weeks ago
- testnet
- active since epoch 980 · ≈ 6 weeks ago
- devnet
- active since epoch 1098 · 2 months ago
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How we know
Solana ships protocol changes behind on-chain switches called feature gates. This page reads the switch itself about every minute — once an activation is requested, it completes at the next epoch boundary, which is where the countdown comes from. No announcements, no invented dates.