Ethereum’s upcoming Glamsterdam upgrade will break one of the network’s oldest invariants: the fixed 21,000 gas cost for sending ETH. The change, part of EIP-8037, forces wallets, gas estimators, and developer tools to update assumptions that have held since the network launched in 2015.
For as long as Ethereum has existed, a simple ETH transfer has cost exactly 21,000 gas, regardless of the recipient. That changes under Glamsterdam. Transfers to existing accounts will still cost 21,000 gas, but sending ETH to an address that does not yet exist on the network will incur an additional state-gas charge on top of the base fee.
The Ethereum Foundation issued the warning on August 17, telling developers that any wallets, dApps, or infrastructure tools still hardcoding a 21,000 gas limit will malfunction once Glamsterdam goes live. The message was blunt: test now or break later.
How the New Gas Model Works
EIP-8037 introduces what the Foundation calls a “reservoir model” that splits Ethereum’s single-dimensional gas meter into two. The first dimension handles computational work, the active processing a transaction performs. The second, state gas, covers the permanent data a transaction creates or touches on the network.
Before Glamsterdam, both types of work shared the same gas limit. After the upgrade, state gas charges draw from a separate reservoir, and the GAS opcode will only return the remaining computational gas. That means smart contracts and tools that rely on the GAS opcode to measure available gas will get a different number than they expect.
The practical impact is most visible in wallet gas estimators. If a wallet sends ETH to a new address, the true gas cost will be higher than 21,000, but the wallet may still display the old number. The result: transactions that fail or underpay miners, frustrating users who thought they had enough gas to complete the transfer.
Why Ethereum Is Making This Change
The gas repricing is tied to Ethereum’s plan to raise the block gas limit to 200 million, up from the current roughly 30 million. A higher gas limit means more transactions per block, which is good for throughput. But it also means more state creation, and Ethereum’s state database, now approaching 390 GiB, would grow at an unsustainable rate if the cost of creating state remained unchanged.
EIP-8037 targets a state database growth rate of 120 GiB per year, ensuring that standard hardware can continue running validator nodes without prohibitive storage requirements. By making state creation more expensive relative to computation, the upgrade discourages wasteful state bloat while still allowing the network to scale.
The Ethereum Foundation said the 200 million gas floor is not aspirational but a concrete target that Glamsterdam enables. Developers are currently testing at a 150 million gas reference block limit to derive accurate state pricing before the full jump.
Platåberget Testnet Opens for Public Testing
To give developers time to adapt, the Foundation launched the Platåberget testnet on August 17, with the Glamsterdam fork activating on August 20. Unlike short-lived devnets used in earlier testing phases, Platåberget is designed to run for several months, giving the community a stable environment to experiment with the new rules.
The testnet is permissionless, meaning any developer, validator, or infrastructure team can join and test their applications. The network will use approximately 50,000 validators across roughly 50 nodes, testing different client combinations. The Foundation encouraged teams to deploy contracts, run nodes, and operate validators against the network to surface compatibility issues early.
After Platåberget testing stabilizes, Glamsterdam will move to Sepolia on September 28, then to Hoodi, before a mainnet launch targeted for Q4 2026. The sequenced rollout gives each layer of the ecosystem time to adapt before the changes reach production.
Broader Changes in Glamsterdam
Gas repricing is only one part of the upgrade. Glamsterdam also introduces enshrined proposer-builder separation, known as ePBS, which changes how Ethereum blocks are constructed by separating the roles of block proposers and block builders at the protocol level.
Block-level access lists, specified in EIP-7928, will record which accounts and storage slots each block touches. That allows client software to optimize disk reads and parallel processing, improving overall network performance and reducing the time it takes to validate new blocks.
The upgrade also raises Ethereum’s maximum deployed contract size from 24 KiB to 64 KiB and increases initcode limits from 48 KiB to 128 KiB, giving developers room for larger and more complex applications. Together with the gas changes, these improvements lay the groundwork for Ethereum’s next scaling phase.
What Developers Should Do Now
The Ethereum Foundation’s guidance is straightforward: deploy on Platåberget, test gas estimators against transfers to new addresses, and audit any code that hardcodes gas limits or reads the GAS opcode. Existing smart contracts are expected to keep working after Glamsterdam, but tools and wallets that make assumptions about gas costs will need updates.
The Sepolia fork on September 28 will be the next major checkpoint. If the testnet runs smoothly, mainnet activation could come as early as October. If issues surface, the timeline could slip into late 2026.
For users, the immediate impact should be minimal. Most ETH transfers go to existing addresses, which remain at 21,000 gas. The changes primarily affect new account creation, contract deployment, and storage writes, activities that are more common in dApp interactions than in simple transfers. But for developers building wallets and infrastructure, the message is clear: the old gas model is going away.
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