BuildNot yet confirmed elsewhere1 publisher3 min readPublished
Solana's rent cut is 90% off for new accounts and a 10x premium frozen into the old ones
SIMD-0437 walks the per-byte deposit from 6,960 lamports to 696 in five gated steps. It is not retroactive, so pre-activation accounts refund ten times what their replacements will.
The Engineer · Build desk
What happened
- SIMD-0437, shipping with Agave 4.2, lowers Solana's rent-exempt rate from 6,960 lamports per byte to 696, a 90 percent cut.
- The cut is not a single switch: it arrives as five independently feature-gated reductions, 6,333, 5,080, 2,575, 1,322 and finally 696.
- A token account deposit falls from about 0.002 SOL to about 0.0002, so an airdrop to 10,000 fresh wallets locks up about 2 SOL instead of 20.
- CloseAccount refunds an account's actual balance rather than the current rent minimum, which is what makes the old deposits recoverable in full.
Why it matters
- capability The recoverable pool is now something a wallet operator or treasury can size once and finish, because it stops growing at final activation and only gets harder to remember.
- decision Anyone who put ZK compression on a roadmap purely for rent savings needs a different reason below large recipient counts, since the writeup's own read is that 40x no longer settles a 500-wallet drop.
- cost Downward pressure on mint costs moves off the base layer and onto whoever charges a flat fee on top, and the minter pays that bill until a protocol chooses to cut it.
- constraint For the duration of the rollout the rent minimum is five different numbers, so any deposit figure quoted to users or baked into a client has a short shelf life.
Step three does most of the work. The rate walks 6,960 to 6,333 to 5,080 to 2,575 to 1,322 to 696 lamports per byte across five separately gated activations [4], and the 5,080-to-2,575 gate alone removes 2,505 lamports per byte, roughly 40 percent of the entire reduction [15]. By the time the fourth gate lands, the rate is already down to 19 percent of where it started, leaving the final flag to deliver the last fifth [16].
The asymmetry is in two sentences of the proposal. The change only relaxes the constraint: accounts are permitted to hold less, never pushed down to the new minimum [7]. And CloseAccount refunds whatever lamports the account actually holds, not what the current rent formula would ask for [8]. So an account funded before activation refunds about 0.002 SOL when closed, and its post-activation equivalent refunds about 0.0002 SOL [9], a ratio of exactly ten to one because that is the ratio of the two per-byte rates [13].
Run that through the numbers in the writeup. One memecoin season commonly leaves 50 to 200 dead token accounts behind [20], which is where the reported 0.1 to 0.4 SOL of dead ATA balance in an active wallet comes from [21]. The same wallet, assembled after full activation, would be sitting on 0.01 to 0.04 SOL instead. The gap, 0.09 to 0.36 SOL per wallet, is over-funding that no future wallet will ever accumulate [26]. Developers carry the larger version of this: an interrupted deploy strands a buffer account holding rent for the whole binary, often 1 to 5 SOL per failed attempt [23], all of it priced at the old rate.
Nothing on the network closes these for you [10]. Tens of millions of empty accounts have already been swept by people who noticed, and far more are still open [22], and the sweep needs no custodian, only a signed instruction with the refund pointed where you like [12].
The second-order effect is a re-ranking of what a mint costs. Metaplex charges a fixed 0.0015 SOL, which becomes the largest line item on a Core NFT mint once the rent underneath it collapses [25]. Against the old ATA deposit that fee was 0.75 times the rent; against the new one it is 7.5 times [17]. Compression takes the same hit in reverse: the rent advantage of compressed accounts falls from roughly 400x to roughly 40x [24], which is the identical factor of ten [18].
One caveat on provenance. This all comes from a single writeup published on dev.to and originally on xroot.dev, which says it checked the proposal text rather than the coverage [14]; the late-August-2026 start for Agave 4.2 mainnet feature activations is that author's timing [19].
What to watch
- Whether wallet software ships a bulk-close flow before the last gates land, and whether refunds credit the old deposit in practice as the proposal text implies.
- Whether any mechanism appears to withdraw the excess lamports from a pre-activation account without closing it, which would turn a reclaim into a spendable balance.
- Whether Metaplex or comparable protocols trim fixed per-mint fees once rent is no longer the dominant cost underneath them.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence24
- Adoption28
- Hype gap+31
- Incentives82
- Confidence31
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
SIMD-0437 lowers lamports_per_byte from 6,960 to 696, a 90 percent reduction, and ships with Agave 4.2.
- [2]
Solana requires every account to hold a minimum SOL balance proportional to the account's size, historically at a rate of 6,960 lamports per byte.
- [3]
At 6,960 lamports per byte, a standard associated token account requires a deposit of roughly 0.002 SOL.
- [4]
The reduction arrives as five independently feature-gated steps: 6,333, then 5,080, then 2,575, then 1,322, then a final rate of 696 lamports per byte.
- [5]
At the final rate of 696 lamports per byte, opening a token account costs about 0.0002 SOL.
- [6]
An airdrop to 10,000 fresh wallets used to immobilise roughly 20 SOL in recipient account rent; the same drop will soon immobilise about 2 SOL.
- [7]
SIMD-0437 is strictly a relaxation of existing constraints: accounts are allowed to hold less, never forced down to the new minimum.
- [8]
CloseAccount returns the account's actual lamport balance, whatever was deposited at creation time, not the current rent minimum.
- [9]
Every token account created before activation still returns about 0.002 SOL on close, and every account created after full activation returns about 0.0002 SOL.
- [10]
Nothing closes accounts automatically; selling a token to zero leaves its empty ATA open, holding its deposit, indefinitely.
- [11]
Leftover wrapped SOL from DEX interactions is both a balance and a rent deposit, and unwraps back to plain SOL.
- [12]
Closing an account is a standard instruction signed by the holder's own wallet, with the refund directed to an address of their choosing, requiring no third-party key custody.
- [13]
The old per-byte rate is exactly ten times the new one.
- [14]
The account of SIMD-0437 relied on here is a single writeup published on dev.to, originally published on xroot.dev, which states its figures were verified against the proposal text rather than headlines.
- [15]
The third gated step, 5,080 to 2,575 lamports per byte, removes 2,505 lamports per byte, about 40 percent of the total 6,264-lamport reduction.
- [16]
After the fourth step the rate is 1,322 lamports per byte, 19 percent of the original 6,960, meaning 81 percent of the total cut is delivered before the final gate.
- [17]
Metaplex's 0.0015 SOL fee was 0.75 times the old ATA rent deposit and becomes 7.5 times the new one.
- [18]
Compression's rent advantage shrinks by the same factor of ten as the per-byte rate cut.
- [19]
Agave 4.2's mainnet feature activations began rolling out in late August 2026.
- [20]
One memecoin season commonly leaves a wallet with 50 to 200 dead token accounts.
- [21]
Active wallets routinely hold 0.1 to 0.4 SOL in dead associated token accounts.
- [22]
Tens of millions of empty accounts have already been closed by people who noticed, and far more are still sitting open.
- [23]
An interrupted solana program deploy strands a buffer account holding rent for the entire binary, often 1 to 5 SOL per failed attempt.
- [24]
Compressed accounts' rent advantage falls from roughly 400x to roughly 40x, still decisive for six-figure recipient lists but no longer decisive for a 500-wallet drop.
- [25]
Metaplex's fixed 0.0015 SOL fee becomes the largest line item of a Core NFT mint rather than the rent beneath it.
- [26]
A wallet holding 50 to 200 dead ATAs at the old rate carries 0.1 to 0.4 SOL; the same set created at the new rate would carry 0.01 to 0.04 SOL, leaving 0.09 to 0.36 SOL of over-funding per wallet.
Sources
1 independent publisher whose own reporting we read for this story.
- dev.toSolana's 90% Rent Cut: The Economics of SIMD-0437
1 article · August 22, 2026
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