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On Oct. 30, 2025, Ethereum ($ETH) blob fees — data availability fees for Ethereum's L2 networks — registered an all-time high. While being painful in general, such spikes are indicators of high demand for Ethereum's ($ETH) throughput. Fusaka, Ethereum's upcoming upgrade, is expected to mitigate such spikes.
42,000 Gwei: Ethereum ($ETH) blob fees log new ATH, community sees "high demand"
Ethereum ($ETH) blob fees — commissions paid by Layer-2 blockchains for using Ethereum's computational resources as a data availability layer — set a historic record Oct. 30, 2025. The metric suddenly spiked over 42,000 Gwei, an Ethereum supporter @materkel mentioned on X.
Not sure if anybody noticed, but blob fees spiked to insane levels yesterday.
— materkel.eth 🦇🔊 (@materkel) October 31, 2025
They peaked at 42,036.2 Gwei (a new record) and stayed above 20k Gwei for ~half an hour.
This is exactly what happens once Rollups start to outbid each other during high demand.
Average fees are now… pic.twitter.com/6SvBv2mJMp
After this sudden spike, Ethereum ($ETH) blob fees stayed in an extremely high zone, over 20,000 Gwei, for almost an hour.
As explained by the speaker, this is a clear indicator of high demand for Ethereum ($ETH) right now — L2 rollups triggered the price by competing against each other for Ethereum ($ETH) resources.
The Ethereum ($ETH) enthusiast stressed that this is the most evident signal of interest in Ethereum ($ETH) and slammed the theory that L2 popularity somehow threatens the biggest smart contracts platform:
Ethereum is in high demand right now, and rumors of L2s being extractive are FUD
This process is not necessarily mirrored by the transactions feed for end users — rollups offset this imbalance by subsidizing blob fees. At the same time, such abnormalities might damage Ethereum ($ETH) user economics.
Will Ethereum Fusaka hard fork fix this?
Opportunities to protect the network from such unpredictable spikes will be included in the agenda of Fulu-Osaka or Fusaka, one of the biggest Ethereum upgrades post-Merge.
EIP-7918: Blob Base Fee Bounded by Execution Cost, included in Fusaka, together with Peer Data Availability Sampling scheme (PeerDAS) will steepen the blob fee dynamics and eventually make Ethereum ($ETH) L1 usage even more cost-effective for rollups.
As covered by U.Today previously, Ethereum Fusaka upgrade is set to go live on the mainnet Dec. 3, 2025. The upgrade has already been activated on Hoodi, a major Ethereum test network.
Ethereum Fusaka will expand the developments of Pectra in terms of speed, security and optimized L1/L2 interaction.