ModExp Gas Cost Increase

The five-minute read

One action, walked through

1. Open EIP 7883 and read the status line before the examples.
2. Write down the rule in one sentence. A fair version of that sentence is: This EIP is modifying the ModExp precompile pricing algorithm introduced in EIP-2565.
3. Name the object that changes: calculate_multiplication_complexity, base_length, modulus_length.
4. Ask what an old client, an old contract, or an offline counterparty does. If the document is silent, the silence is part of the design.

The argument, unpacked

What has to be true

• You are implementing EIP 7883 at the status the text itself states: Final.
• The object that has to change is calculate_multiplication_complexity, base_length, modulus_length. A neighbouring document with a similar name is not this one.
• Constants in the text can be superseded by a later fork. Cite the EIP number and the fork you mean.

What happened after the paper

The source marks this final. That is a statement about the text, not a promise that every wallet or node has shipped it. Later documents can narrow, replace, or ignore this one. Cite the number you mean.

What to check before you use the idea

• What does ModExp Gas Cost Increase charge, reject, or redefine on the first touch versus a later one?
• Does a reverted subcall roll the change back?
• Can you point at the object in a client: calculate_multiplication_complexity, base_length, modulus_length?

Terms

EIP 7883

The public text titled ModExp Gas Cost Increase.

Final

The document's own label for how finished the text is. It is not a market fact.

The problem the paper names

An underpriced or ambiguous EVM rule is not a feature. It is a block that takes longer than the gas limit claimed, or a client that disagrees about the result.

What the design proposes

• This EIP is modifying the ModExp precompile pricing algorithm introduced in EIP-2565.
• Currently the ModExp precompile is underpriced in certain scenarios relative to its resource consumption.
• By adjusting the pricing formula, this EIP aims to address these discrepancies, making ModExp sufficiently efficient to enable potential increases in the block gas limit.

How the mechanism is specified

• Taken from the specification, the next constraint is: Currently the ModExp precompile is underpriced in certain scenarios relative to its resource consumption.
• Locate calculate_multiplication_complexity, base_length, modulus_length in EIP 7883 and apply it to one transaction or call.
• Then check the failure the class of rule always has: a node that did not upgrade, a reverted call, a replayed signature, or a peer that does not speak the message.

What this page does not treat as proven

• A gas or opcode change is not a throughput benchmark. It is a relative price and a validity rule.
• Constants in the text can be superseded by a later fork. Cite the EIP number and the fork you mean.
• The source marks this final. That is a statement about the text, not a promise that every wallet or node has shipped it.

Why a venture studio still reads it

Use EIP 7883 when a pitch says 'ModExp Gas Cost Increase' without saying whether the rule is consensus, policy, or an interface. The number is the citation. The pitch is not.