Pectra blob capacity creates fee market imbalances

Ethereum’s Pectra upgrade increased the target blob count per block to 6 and the maximum to 9. Rollups currently consume only two-thirds of this new target. Since the May 7, 2025, activation, rollups purchased 25,600 blobs daily on average, up from 21,200. This surge in supply creates an oversupply situation where blob gas prices drop to 1 wei. The current target-to-maximum ratio of 2:3 disrupts symmetrical responsiveness in the fee market because the base fee decreases by 14.5% during empty usage but only increases by 8.2% when usage hits the target. This imbalance forces the base fee toward 1 wei whenever demand falls below the target. The fee market fails to converge on equilibrium when execution gas costs dominate blob gas costs. Before the upgrade, rollups purchased 2.7 gigabytes of data capacity daily, while they purchase 3.3GB today, which shows a 20.8% increase. The median cost per blob object since Pectra went live is $0.00000000035. The current blob throughput settings create a volatile economic environment for Layer 2 networks.

Oversupply and fee volatility

Consensus layer nodes must hold rollup blob data for at least 18 days before they can remove it from their machines. This requirement creates a growing storage burden for the network. Following the Pectra upgrade, consensus layer nodes reached a new high of 44.6GB in unpruned rollup data. If demand reaches the target rate, these nodes will carry between 95GB and 100GB of data. The increase in daily blob purchases pushes the amount of data nodes maintain between pruning to new highs. You should watch these storage requirements as rollups saturate the new parameters.

The amount of data capacity available daily rose from 5.5GB to 8.15GB, yet rollups purchase only 3.3GB of dataspace. This means rollups use only 40% of the maximum data capacity each day, compared to 50% under previous parameters. A single blob holds 128kb, and blobs have been 86% full on average post-Pectra compared to 82% previously. Rollups are currently purchasing 20.8% more blobs daily than they did pre-upgrade.

Rollup economic shifts

Rollups like Base and Linea saw improved profit margins because blob costs collapsed. Base earned $1.22 million in revenue after onchain costs as the biggest beneficiary in absolute terms. In the 60 days leading into the upgrade, rollups paid a daily average of $16,250 in blob fees, but this fell to less than one-thousandth of a penny daily after Pectra. The total amount of blob fees paid since Pectra went live is just four-thousandths of a penny. However, the reduction in blob costs does not guarantee lower transaction fees if Ethereum layer 1 base fees spike. A 650% week-over-week increase in L1 base fees following Pectra activation helped keep total costs for rollups elevated. In the 60 days before the upgrade, 11.22 ETH burned daily on average, but only 3.26 ETH burns daily now. Most of this burned ETH comes from base fees of type-3 execution layer transactions. In extreme scenarios where blob gas prices spike and utilization remains low, calldata can actually become cheaper than using blobs. Does the current fee mechanism provide enough stability for rollups when execution gas costs vary? Rollups like Linea and Base maintain the strongest percent margins after onchain costs at 98.86% and 98.54%. Blast saw its percent margins expand from the high 50% range to over 80%. The mismatch between blob gas and execution gas costs remains a risk for rollups that cannot absorb fee spikes.