ETH readies Glamsterdam upgrade to cut fees

TLDR

Ethereum (ETH) is preparing the Glamsterdam upgrade, a major 2026 hard fork aimed at boosting base layer capacity and lowering many transaction fees through higher gas limits and new gas accounting rules.

1. Glamsterdam combines the Amsterdam and Gloas changes, with a Sepolia testnet fork scheduled for 6 Oct 2026 before a mainnet rollout targeted for late 2026.
2. The upgrade brings proposer builder separation, block-level access lists and gas repricing, enabling higher gas limits and more parallel execution that should reduce simple ETH transfer and rollup-related fees.
3. Contracts using fixed gas assumptions face compatibility risk, so developers and users should watch testnet results and final gas schedules to see who benefits most from fee cuts.

Deep Dive

1. Where Glamsterdam Stands

Glamsterdam is Ethereums next major upgrade after Fusaka and is treated by core developers as one of the largest forks since the Merge, combining the Amsterdam execution layer and Gloas consensus layer packages Glamsterdam combines Amsterdam and Gloas.

Developers have scheduled Glamsterdam to activate on the Sepolia public testnet on 6 Oct 2026 at 13:53 UTC, with mainnet deployment still targeted for the fourth quarter of 2026 but not date locked yet Glamsterdam upgrade on Sepolia.

Glamsterdam sits inside a roadmap that now aims for roughly two upgrades per year, followed by Hegot later in 2026 to push further on Verkle trees, censorship resistance and state reduction Ethereum roadmap overview.

2. How It Can Cut Fees

Glamsterdams core scaling features are:

1. Enshrined proposer builder separation (ePBS), which moves the block builder-validator handoff into the protocol, letting the network safely raise gas limits without overloading individual validators Glamsterdam combines Amsterdam and Gloas.
2. Block-level access lists (EIP-7928), which make state access per block explicit so clients can validate and process parts of a block in parallel, increasing effective throughput.
3. Gas repricing for state creation and access (for example EIP-8037 and EIP-8038), plus tweaks to calldata and transaction gas, intended to align fees with real resource use and support up to roughly 3x higher base throughput Glamsterdam gas repricing and throughput.

By raising the gas limit toward the 100 million to 200 million range and improving efficiency, analyses suggest that simple L1 transfers and some data heavy operations could see fee reductions of more than 70 percent in high-capacity scenarios Glamsterdam era analysis. Rollups should also benefit from cheaper L1 data and faster inclusion.

3. Risks And What To Watch

Gas repricing is not universally good news. Contracts that rely on fixed gas stipends, hardcoded gas limits, or assumptions about how much gas remains during execution may break or become more expensive to run Glamsterdam gas repricing and throughput. Developers will need to test and possibly update DeFi, NFT and infrastructure contracts against Sepolia and later testnets.

Node operators and validators must upgrade both execution and consensus clients ahead of each testnet and mainnet activation, or they will fall off the canonical chain Glamsterdam upgrade on Sepolia. Early incidents on devnets already uncovered bugs in consensus and EIP-8037 implementations, underscoring the need for thorough testing.

For users and investors, the key signals will be: smooth Sepolia and Hoodi testnet runs, the final mainnet gas limit target, how L2 fees respond, and whether any major apps report incompatibilities or migrations.

Conclusion

Glamsterdam is designed to make Ethereum faster and cheaper primarily by safely raising gas limits and modernizing how gas is charged, rather than by a cosmetic change to the fee market. If testing validates the design and client teams manage the complexity, Ethereum could emerge with significantly lower average fees and stronger L1 capacity, while poorly prepared contracts and infrastructure face the main adjustment risk.