OpenChainGraph Suite · ART-815 · Ethereum Fee Market
Ethereum Base Fee and Blob Base Fee Recompute
Recomputes the next block’s base fee per gas (EIP-1559) and its base fee per blob gas (EIP-4844, with the EIP-7918 reserve-price rule from Osaka on) from the parent-header values you declare. Integer arithmetic only, checked against the execution-specs reference code.
EIP-1559 · EIP-4844 · EIP-7918Fork parameters declared or defaultedDeclared inputs only
🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
⚠ Recompute from the published formula and your declared parameters; not a prediction of future fees. The page reads no chain. Fork parameters default to the named fork’s published blob schedule (BPO2 when no fork is named); any you declare instead are listed in the output. The London fork-transition block, priority fees and L2 fee models are out of scope.
Inputs
Amounts above 2^53 go in as decimal strings. fork is one of cancun, prague, osaka, bpo1 or bpo2 (default bpo2). fork_parameters is optional and may set target_blobs, max_blobs, base_fee_update_fraction, reserve_price, elasticity_multiplier or base_fee_max_change_denominator. The base_fee and blob_fee sections are each optional, but at least one is needed; leave one out and its figures come back as null. On reserve-price forks (Osaka on) blob_fee needs the parent base fee per gas.