Solana SIMD-0649 Fee-Priority Proposal Closes Without Merge

Solana’s SIMD-0649, a governance proposal titled “Priority Ordering Within Entry Batches,” closed without a merge on September 25, 2026, four days after it was opened. The pull request record shows merged_at: null, confirming the change was not adopted into the protocol.

What Happened to Solana’s SIMD-0649 Fee-Priority Proposal?

SIMD-0649 was opened on September 21, 2026 and closed on September 25 without being merged into the Solana Improvement Documents repository. The proposal would have made non-increasing priority order within each EntryBatch a block-validity rule, meaning blocks containing transactions arranged outside that order would be considered invalid. For related coverage, see Solana Hits 7-Month High Above $110 as Open Interest Jumps 18%.

The closure was not a rejection on the merits. Jacob Creech’s closing comment on the pull request stated the PR was closed pending more discussion and that more ACKs from client developers were needed. The SIMD bot records that a proposal requires at least one approval from an Anza team member and one from a Firedancer team member before it can be merged, a threshold SIMD-0649 did not reach. For related coverage, see XRP ETFs Hit 10-Week Green Streak as Solana Funds Lead.

Why a Merge Matters in the SIMD Lifecycle

In Solana’s governance process, a merged SIMD becomes a formally accepted specification that client teams implement. A closed-without-merge status means the proposed rule change carries no implementation obligation; it may be revised, resubmitted, or abandoned entirely. Closing is distinct from rejection, but the outcome for protocol state is identical: nothing changes.

Why Fee Priority Remains a Solana Fee-Market Topic

Fee-priority mechanisms govern how transactions are ordered and selected for inclusion in blocks, directly affecting traders, MEV strategies, and the predictability of execution. The SIMD-0649 discussion explicitly acknowledged a key limitation: even if the rule had passed, block producers would still control transaction inclusion and EntryBatch boundaries. The proposal would not have provided slot-global ordering or guaranteed fair ordering across an entire block.

The proposal’s own discussion framed fairness, determinism, and inspectable market structure as motivating goals, citing potential benefits for trader onboarding and regulatory clarity. These remain open design questions for Solana’s fee market regardless of this proposal’s status. Separate governance discussions on fee-market design, including debates about priority fee floors and local fee markets, continue across the ecosystem; the ZetaChain vote to migrate to Solana is one recent signal of continued developer interest in the network’s long-term fee structure.

SOL was trading at $123.17, up 1.63% over the prior 24 hours, with a market capitalization of approximately $72.4 billion and 24-hour volume near $3.82 billion at the time of writing. The broader crypto market Fear & Greed Index stood at 70, in “Greed” territory.

What to Watch Next

The path forward depends on whether the proposal’s author or other contributors revise the specification and re-submit with broader client-team support. The core technical debate around within-batch ordering and its limits will likely surface in the ongoing SIMD discussion thread. Watchers should track whether Anza and Firedancer engineers signal support for a revised version, which would be a prerequisite for any future merge. Broader Solana governance activity, including other proposals reaching final vote, can be compared to recent governance outcomes in other ecosystems, such as the Cardano DReps’ rejection of a 12.29 million ADA treasury proposal and the Aave borrowing limit proposal that put Bitcoin-backed loans at risk.

Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency and digital asset markets carry significant risk. Always do your own research before making decisions.