Anza CEO Says SIMD-123, SIMD-550, and SIMD-553 Will All Ship This Year

Anza CEO Brennan Watt said on June 20 that three of Solana's most consequential economic proposals are all on track to ship this year. SIMD-123, which redirects priority fees to validators, is nearly code-complete. SIMD-550, which doubles the disinflation rate, and SIMD-553, which introduces resource-based fees burned entirely, have both received concept ACKs from Anza — the client team that maintains the Agave validator.

"They'll all get done this year," Watt wrote. "123 already passed and almost code complete. 547 (discussion) and 553 (SIMD) are the same thing. 553 and 550 are both a concept ACK for Anza."

The statement marks the first time Anza's leadership has publicly grouped all three proposals under a single delivery commitment. Each addresses a different layer of Solana's economic model: how fees flow, how fast inflation falls, and how transaction costs scale with resource consumption.

SIMD-123: Block Revenue Sharing Reaches Code Completion

SIMD-123 cleared a governance vote in March 2025 with 74.91% in favor, per the Solana governance record. The proposal lets validators share block revenue with delegators by setting a commission rate on their vote account. Under the current model, priority fees flow entirely to the block leader; SIMD-123 routes the post-commission portion to stake accounts at epoch boundaries, aligning validator revenue with the delegators who back them.

Watt confirmed the proposal is "almost code complete" against the Agave 4.1 target, making it the nearest to deployment of the three. A feature gate will activate the change at an epoch boundary once the implementation clears review.

SIMD-550: Faster Disinflation Earns Concept ACK

Helius researchers Lostin and 0xIchigo published the case for SIMD-550 on June 16. The proposal doubles the annual disinflation rate from 15% to 30%, compressing the timeline to reach Solana's 1.5% terminal inflation rate from 5.7 years to 2.8 years. Over six years, that translates to roughly 18.9 million fewer SOL emitted — a meaningful reduction in sell pressure from staking rewards.

Anza's concept ACK is a formal signal of technical endorsement, not an implementation commitment, but it clears the most consequential blocker for a proposal of this type. Staking yields would compress faster under the accelerated schedule, declining from approximately 5.84% toward 3.00% within two years instead of six.

SIMD-553: Resource-Based Fees, 100% Burned

SIMD-553 targets the gap between compute units requested and compute units consumed. Transactions on Solana today request far more compute than they use: a 200,000-unit request that consumes only 40,000 units still occupies scheduling capacity as if it needed the full amount, because fees are not tied to what was requested.

The proposal, authored by Anza researcher @cavemanloverboy and covered here on June 18, splits the existing per-signature base fee into two components: a 2,500-lamport inclusion fee that goes to the block leader, and a resource fee equal to requested_cost_units × 0.5 that is burned in full. The burn would lift daily SOL destruction from roughly 648 SOL to an estimated 7,500–9,000 SOL (a 12–14x increase) without touching the priority fee market that already routes correctly.

Watt's tweet clarified that SIMD-547, which circulated as a discussion document, and SIMD-553 address the same problem. The filed SIMD-553 is the active proposal.

What the Roadmap Commitment Does and Does Not Mean

The three proposals have been advancing on separate tracks, each with its own authors, sponsors, and community discussions. Watt's grouping of them into a single year's roadmap is notable because their combined effect, implemented in sequence, would touch fees, inflation, and block revenue simultaneously — the broadest rework of Solana's base-layer economics in one delivery window.

Concept ACKs from Anza do not guarantee a governance vote outcome or a specific shipping quarter, and all three proposals must still clear their respective implementation and review stages. The public commitment from the client team's CEO does, however, narrow the uncertainty that has surrounded the governance calendar for each of them.

Governance votes for SIMD-550 and SIMD-553 have not yet been scheduled.