Ethereum (ETH) Glamsterdam Upgrade Activates on Sepolia With 200M Gas Limit

Glamsterdam Reaches Sepolia

Ethereum (ETH) entered the public test stage of its next hard fork on Tuesday, October 6, when the Glamsterdam upgrade activated on the Sepolia testnet. Sepolia sits directly below mainnet in the deployment pipeline: after internal engineering builds, it is the principal environment where application teams, wallet providers and infrastructure operators run new features before anything is scheduled for the live chain. What now stands on Sepolia is Glamsterdam, the largest upgrade left in the pipeline, and the stage after it is production. Its most consequential change is a sharp increase in the block gas limit, which Sepolia raised from 60 million to 200 million gas, more than a threefold jump. The gas limit caps how much computation a single block can contain, so a larger limit lets each block carry more transactions and more smart contract executions, lifting the throughput of Ethereum's base layer and the operations applications can rely on per block. Fee markets repriced the new capacity within hours. The base gas fee fell from around 1 gwei to roughly 20 wei, because block space supply abruptly outran demand at existing usage levels. A gwei equals one billion wei, so 20 wei is a vanishingly small fee by mainnet standards, and fees readjust automatically as network usage moves. Early readings are exactly that: demand on a test network does not resemble mainnet load, so the wei-level fee is a symptom of thin usage, not a forecast. The activation is also a deliberate step along Ethereum's scaling roadmap, which pairs bigger blocks with a check that every node can process and propagate them stably. The Ethereum (ETH) price showed no sharp immediate reaction to a test-stage deployment.

The performance picture is still thin. Terence, a developer on the Prysm consensus client, published early network measurements after activation, and the numbers carry the same caveat: client processing capacity, block propagation speed and the load on each node need longer observation before any conclusion holds. Prysm's readings are set to be re-run as the testnet accumulates real usage from external teams. The caution follows from the design. Widening the road is only half the work: a 200 million gas block is far heavier to execute and broadcast than a 60 million gas block, and validator hardware and bandwidth decide whether the extra headroom survives contact with real traffic. Node operators, block explorers and wallet teams now run the fork rules on Sepolia, which surfaces integration issues an internal build cannot. If usage stays flat, blocks carry more work per bundle at near-zero base cost; if usage rises, the fee market pulls base fees back up under the existing mechanism. The schedule ahead is explicit. Client teams are targeting feature-complete releases by Friday, October 16, and the Hoodi testnet upgrade is set for October 26, giving operators a second public environment before any mainnet decision. Glamsterdam moves through the same staged hard-fork process Ethereum (ETH) has run since its Ethereum 2.0 transition, with each environment clearing before the next one opens. Market context around the engineering is soft. Weekly Ethereum data compiled from fund-flow trackers shows $542.2 million in net outflows from US spot ETH ETFs over the past week, a spot ETF outflow streak that has weighed on the asset while the upgrade calendar advances.

Supply Outpacing Demand

The Sepolia fee collapse says more about supply than demand. A base fee near 20 wei under a 200 million gas limit shows the chain can now offer capacity far beyond current usage, which on mainnet would compress costs for users and shift margin back toward the base layer. The unresolved question is cost, not capability: heavier blocks raise the bandwidth and storage bill for every node operator, and the upgrade only succeeds if that bill does not thin the network. The stakes rise as Ethereum (ETH) anchors a broader Wall Street build-out on the base layer, a use case that favors predictable, cheap execution. None of it reaches production until the remaining gates clear: feature-complete client releases by October 16 and the Hoodi testnet upgrade on October 26.