EIP-8123: JSON-RPC Method for Transaction Gas Limit Cap

EIPs EIPs interfaces
1

Discussion topic for EIP-8123

EIP-8123 introduces a new JSON-RPC method called eth_txLimitGasCap for querying the EIP-7825 tx gas limit cap. See the full EIP details in the GitHub PR:

Update Log

  • 2026-01-11: initial draft

External Reviews

None as of 2026-01-11.

Outstanding Issues

None as of 2026-01-11.

2 Likes
2

Great proposal! Quick question about implementation: should clients return the
cap even if EIP-7825 isnā€™t active yet on that chain, or should they return null
until the fork activates? Also curious how this would work for chains that
havenā€™t implemented 7825 at all.

3

Thanks @dicethedev! If EIP-7825 isnā€™t active, the chain should return null, indeed. With one exception - even if the chain hasnā€™t upgraded to Fusaka yet, if they enforce a custom policy for tx gas limits, they should return that value. For example, Base enforces a 25M cap today (and they havenā€™t upgraded to Fusaka yet).

I wrote a piece of pseudocode in the EIP on GitHub, cross-sharing here for visibility:

if protocol has finite tx gas cap at head:
  protocolCap = that value
else:
  protocolCap = +infinity

if protocol has policy cap:
  policyCap = that value
else:
  policyCap = +infinity

cap = min(protocolCap, policyCap)

if cap is finite:
  return cap
else:
  return null
1 Like
4

@PaulRBerg Got it, thanks! So policy caps take precedence when stricter than protocol caps, and null only when thereā€™s truly no limit. The Base example makes it clear. Looking forward to this being adopted!

1 Like