Ethereum's Glamsterdam Upgrade: What It Means for Your Gas Costs
Glamsterdam targets a 78% gas reduction and 10x throughput on Ethereum L1. Here's what the three core EIPs change and what it means for swap costs.
Ethereum is preparing its most structurally significant upgrade since The Merge. Glamsterdam, targeted for the first half of 2026, changes how the network builds and executes blocks at the protocol level — and the downstream effect is roughly 78% cheaper gas across all transaction types, from simple ETH transfers to multi-step DeFi operations.
If you execute swaps on Ethereum mainnet, this directly affects what you pay. And unlike timing tricks like swapping at 3am UTC to catch a quiet period, this is a permanent structural reduction — baked into the protocol, not contingent on network conditions.
What Glamsterdam Is Changing at the Core
Glamsterdam bundles several proposals, but three changes account for almost all of the user-facing impact.
1. EIP-7732 — Enshrined Proposer-Builder Separation (ePBS)
Today, when Ethereum blocks are built, validators rely on a network of off-chain relays and external block builders to assemble the most profitable blocks. This system (called MEV-Boost) has worked since The Merge, but it operates entirely outside the protocol, relying on trusted intermediaries rather than enforced rules.
ePBS moves block building into the protocol itself. Validators remain responsible for proposing blocks, but a credentialed builder class handles the assembly. The rules governing this interaction are encoded in consensus — not enforced by trust.
This matters for swap users because MEV is a direct tax on your trades. Sandwiching, front-running, and back-running extract value from your transactions before they settle. Enshrining PBS doesn't eliminate MEV, but it creates a cleaner, more auditable environment where fairness rules can be enforced at the protocol level rather than hoped for at the relay level.
2. EIP-7928 — Block-Level Access Lists (BALs)
Current Ethereum execution is sequential: transactions process one after another within a block, and clients can't know in advance which storage slots each transaction will touch. Block-Level Access Lists change this by requiring each block to declare upfront which accounts and storage slots it will access.
With that map available before execution starts, clients can preload the relevant state and run independent transactions in parallel. Sequential execution is one of the main bottlenecks limiting Ethereum's throughput today. BALs enable parallel processing without a full EVM redesign, which makes them one of the most practically significant EIPs the network has shipped in years.
3. EIP-7904 — Gas Repricing
Gas costs on Ethereum are measured in units tied to computational effort, but the calibration of those units was set years ago and has drifted significantly from what operations actually cost modern clients. EIP-7904 recalibrates gas costs across opcodes using current client benchmarks, correcting that drift.
The result is a 78.6% reduction for both simple ETH transfers and complex smart contract interactions. A Uniswap trade that currently costs $3–8 in gas fees could drop below $1. Multi-step DeFi operations involving several contract calls see proportionally larger reductions, since every opcode call in the chain gets repriced.
How the Changes Stack Up
Gas repricing and the gas limit increase compound each other — more transactions fit in each block at lower cost per unit, which means the effective throughput gain is larger than either change alone.
| Change | What It Does | User Impact |
|---|---|---|
| EIP-7732 (ePBS) | Block building moved into protocol | Fairer MEV environment, reduced sandwich risk |
| EIP-7928 (BALs) | Parallel execution via state maps | Higher throughput, fewer congestion spikes |
| EIP-7904 (Gas Repricing) | Recalibrated opcode costs | ~78% reduction in gas fees |
| Gas limit increase | 60M → 200M gas per block | ~10x throughput, targeting ~10,000 TPS |
The gas limit increase from 60 million to 200 million gas per block is a separate parameter change, but it depends on BALs to work safely. Without declared access lists, tripling the gas limit would make block propagation dangerously slow. The proposals are designed to ship together.
What This Means If You Swap on Ethereum Mainnet
Three things change for the average swap user.
First, the baseline fee drops. Today, the gas fee on a standard Ethereum swap varies with congestion in real time. After Glamsterdam, the recalibrated baseline is substantially lower — meaning even during moderate traffic you're paying a fraction of current costs. Quiet-period gas savings stack on top of that.
Second, congestion events get less severe. The combination of a tripled gas limit and parallel execution means the network absorbs more activity before it hits its ceiling. Fee spikes during volatile market periods — the moments when you most want to swap and least want to pay $40 in gas — will still happen, but they start from a lower floor and take longer to develop.
Third, multi-step DeFi becomes more competitive with L2s. Today, complex operations like a routed swap touching multiple liquidity pools might cost 80–95% less on Arbitrum or Base than on mainnet. After Glamsterdam, that gap narrows. Some DeFi activity may shift back to L1, which matters if you prioritize mainnet security guarantees over the trust assumptions that come with rollups.
That doesn't make L2s obsolete. For frequent low-value swaps, Arbitrum, Base, and other rollups will still win on cost. But the calculus shifts for larger transactions where the mainnet security model is worth more.
If you want to understand how current gas pricing works before Glamsterdam lands, this breakdown of gas fees and congestion covers the mechanics and how to time swaps around them.
Timeline and What Could Slip
Glamsterdam has been targeting H1 2026, with June as a community-aspired milestone. Whether it ships in that window depends on testnet validation — and the interplay between ePBS and BALs introduces complexity that hasn't been tested at mainnet scale.
Things worth watching:
- Devnet and testnet results — If ePBS and BAL interactions surface bugs under load, the timeline moves. Ethereum's execution cadence improved with Pectra and Fusaka, but Glamsterdam's scope is larger than both combined.
- Gas repricing parameter finalization — EIP-7904 requires careful calibration. Miscalibrated opcode costs can create unexpected attack surfaces or change incentive structures in ways that require additional auditing rounds.
- Builder ecosystem readiness — ePBS requires a credentialed builder market operational on day one of mainnet. If tooling or infrastructure isn't ready, block quality during the transition period could suffer.
- Hegotá dependency — Ethereum's roadmap positions Glamsterdam as a prerequisite for the following fork, Hegotá, which targets post-quantum account abstraction via EIP-8141. A Glamsterdam slip pushes the entire downstream roadmap.
The realistic framing: if Glamsterdam ships this summer, mainnet gas costs drop structurally by Q3. If it slips to Q4 or into 2027, the current pricing environment continues that much longer.
Use the Ethereum Gas Tracker to monitor current mainnet conditions in real time while you wait.
The Bottom Line
Glamsterdam is a protocol-level restructuring, not a market event. The 78% gas reduction comes from correcting years of drift in how the network accounts for computational work — it takes effect the moment the upgrade activates, regardless of demand or congestion levels. When it ships, every swap on Ethereum mainnet costs less by default.
The main risk is timeline. If gas costs are material to your current swaps, the L2 Gas Tracker can show you cheaper execution alternatives on Arbitrum, Base, and other rollups in the meantime. ETH is available to swap on Zest Exchange.