EIP-4844 shipped in March 2024 with a clear promise: cheap data availability for Layer 2s, paid via a separate blob fee market that wouldn’t compete with ordinary transaction gas. Eighteen months later, the promise held - almost too well. Blob base fees have spent the overwhelming majority of time at or near their floor of 1 wei. The target utilization mechanism, modeled on EIP-1559’s mainnet fee adjustment, was designed to find equilibrium. Instead it found a basement and stayed there.
This isn’t a failure, but it’s not quite the success story the rollup ecosystem keeps describing either.
What actually happened to L2 fees
The practical outcome for users on networks like Base, Arbitrum One, and Optimism has been dramatic. Transaction fees on major L2s dropped to fractions of a cent for simple transfers after Dencun activated. That compression is real and it matters for actual adoption - low fees change user behavior, particularly for smaller transactions that were previously uneconomical.
But blob capacity has scaled faster than L2 demand has filled it. Ethereum currently targets three blobs per block, with a max of six. Average utilization has remained well below target for extended stretches, which keeps the blob base fee pinned near zero through the same exponential adjustment logic that would send it sky-high if blocks were consistently full.
The Pectra wrinkle
Pectra, which activated on mainnet in May 2025, raised the blob target to six and the maximum to nine via EIP-7691. The intent was to give rollups more headroom as usage grew. The actual effect, at least in the near term, was to increase spare capacity further. More ceiling, same demand curve.
Ethereum developers have discussed this openly. The blob fee market will eventually clear - if L2 transaction volume continues growing and rollups post data more frequently, blob fees will normalize above zero. At that point, the fee adjustment mechanism becomes meaningful rather than ornamental.
The fee market is a pressure gauge, not a revenue stream
One underappreciated consequence of near-zero blob fees: ETH burn from blobs is essentially nonexistent. EIP-1559 burns base fees on mainnet, and the blob fee market follows the same structure. When blobs cost 1 wei, the burn is negligible.
This reopens a quiet debate about ETH’s supply dynamics. Mainnet activity and its associated gas burn remains the primary deflationary mechanism. Blobs, by design, offload data costs away from mainnet - which means high L2 adoption and low mainnet congestion can produce a net inflationary environment, depending on staking issuance levels.
The blob fee market is doing exactly what it was designed to do. The design just has an implicit assumption baked in: that demand would eventually compete for the space. That competition hasn’t arrived yet, and Ethereum’s roadmap keeps expanding supply in anticipation of it.