Glossary
Excess Blob Gas
The Ethereum block-header field tracking how far above or below the blob-target the chain has been — drives the blob-base-fee adjustment formula.
Every Ethereum block header (post-Dencun) carries
excess_blob_gas: the cumulative deviation of blob usage from
the per-block target (3 blobs pre-Pectra, 6 post-Pectra). When
blocks consistently include more blobs than target, the value
grows; when they include fewer, it shrinks.
The blob base fee for the next block is computed from
excess_blob_gas via an exponential formula. The mechanism is
the analog of EIP-1559's base-fee adjustment but for the blob
fee market, and it auto-corrects toward target throughput
without governance input.