Ethereum's Pectra Upgrade Drives Blob Fees to Near-Zero
The recent upgrade to Ethereum's Pectra-era blob fee market has led to significant changes in the network's data availability economics. On May 7, 2025, the target blob count was increased from 3 to 6 per block via EIP-7691, resulting in a daily capacity gain of 8.15GB of data. This increase in capacity has reduced the scarcity that rollups face, allowing them to buy 20.8% more blobs daily.
However, the average number of blobs per block remains 33% below the new target, creating an imbalance that makes blobs 'virtually free' for the first time since mid-April 2025. Rollups paid just $0.0000395 in total blob object costs in the five full days following the activation, a near 100% decline compared to the 60 days before the upgrade.
The amount of ETH burned from rollup data posting through blobs declined by 71% after activation, falling from 11.22 ETH daily to 3.26 ETH daily. The static minimum blob base fee set by EIP-4844 proved problematic when blob space was underutilized throughout 2024 and was later replaced with a dynamic minimum tied to L1 execution costs via EIP-7918 in the Fusaka upgrade.
L2 sequencer margins improved significantly as data costs fell, benefiting networks with high transaction volumes. Base achieved a 98.54% profit margin after onchain costs, while Linea held 98.86%. Blast saw its percent margins expand from the high 50% range to over 80% today.