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MIP-5

Fusaka EIP Activation

Final Standards Track Core bundled in MONAD_NINE GitHub ↗ Forum ↗
Idea Draft Review Last Call Final Living

Activate EIP-7823, EIP-7883, and EIP-7939 from Ethereum's Fusaka upgrade.

Authors
Category Labs
Created
2026-01-19
Updated
Jun 15, 2026

Stakeholder Impact

What this MIP changes for each audience. Severity and action flags are model-derived with deterministic floors per MIP type/category.

AI summary unavailable — backed by structural defaults

TL;DR

AI insights unavailable for this MIP — showing structural defaults below.

What's Changing

  • AI insights unavailable for this MIP — showing structural defaults below.

Developers

Smart contract & dapp builders, RPC consumers, tooling authors

Low

Users

Wallet users, EOA holders, dapp visitors

Low

Validators

Node operators, RPC operators, delegators

Medium

Foundation

Monad Foundation & Category Labs core devs

Low

Specification

Cite

## Abstract

Activate three EIPs from Ethereum's Fusaka upgrade ([EIP-7607](https://eips.ethereum.org/EIPS/eip-7607)): EIP-7823, EIP-7883, and EIP-7939.

## Specification

This MIP activates the following EIPs:

- [EIP-7823: Set upper bounds for MODEXP](https://eips.ethereum.org/EIPS/eip-7823)
- [EIP-7883: ModExp Gas Cost Increase](https://eips.ethereum.org/EIPS/eip-7883)
- [EIP-7939: Count leading zeros (CLZ) opcode](https://eips.ethereum.org/EIPS/eip-7939)

### Excluded EIPs

The following EIPs are already activated by Monad:

- [EIP-7951: Precompile for secp256r1 Curve Support](https://eips.ethereum.org/EIPS/eip-7951)

The following EIPs pertain to Ethereum consensus layer and data availability, so
are not relevant to Monad:

- [EIP-7594: PeerDAS - Peer Data Availability Sampling](https://eips.ethereum.org/EIPS/eip-7594)
- [EIP-7917: Deterministic proposer lookahead](https://eips.ethereum.org/EIPS/eip-7917)
- [EIP-7918: Blob base fee bounded by execution cost](https://eips.ethereum.org/EIPS/eip-7918)

The following EIPs set parameters for which Monad makes different choices per [the Monad specification](https://category-labs.github.io/category-research/monad-initial-spec-proposal.pdf) (30M
transaction gas limit, and 2MB block size), so are not included:

- [EIP-7825: Transaction Gas Limit Cap](https://eips.ethereum.org/EIPS/eip-7825)
- [EIP-7934: RLP Execution Block Size Limit](https://eips.ethereum.org/EIPS/eip-7934)

## References

- [Monad Initial Specification](https://category-labs.github.io/category-research/monad-initial-spec-proposal.pdf)

## Copyright

Copyright and related rights waived via [CC0](../LICENSE.md).

Forum discussion

1 posts · 1 likes · 5 months ago
Read more on forum ↗
  1. @Bruce Collie #1 Jan 19, 2026, 11:28 AM

    github.com/monad-crypto/MIPs MIP-5: Fusaka EIP Activation main ← bruce/mip-5 opened 11:28AM - 19 Jan 26 UTC Baltoli +47 -0 This MIP proposes the activation of Monad-relevant execution EIPs included in Ethereum’s Fusaka upgrade.