added MONAD_SYSTEM_ADDRESS#12585
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mattsse merged 3 commits intofoundry-rs:masterfrom Nov 17, 2025
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Jayakumar2812
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zerosnacks
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0xrusowsky
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Nov 17, 2025
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@Jayakumar2812 please run rustfmt to fix the CI errors |
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Nov 19, 2025
Simplify Option unwrapping patterns in gas snapshot handling: - Replace is_some() + unwrap() with if let Some pattern - Remove redundant intermediate variable binding Add missing test for MONAD_SYSTEM_ADDRESS constant: - Test coverage was incomplete after PR foundry-rs#12585 - Add assertion to verify MONAD_SYSTEM_ADDRESS constant value
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Motivation
Monad introduces system transactions executed at zero gas by the protocol.
These appear in the block as regular transactions but do not follow basefee rules.
Currently, Foundry tools (cast, --quick, etc.) treat these as normal transactions.
This causes:
• cast to fail with Error #1: transaction validation error: gas price is less than basefee
• --quick to fails when multiple system transactions exist in the same block, leading to nonce-too-high errors
Solution
Added MONAD_SYSTEM_ADDRESS and updated transaction handling to skip Monad system transactions, similar to how L2 system txs are ignored.
This prevents validation errors caused by 0-gas system transactions in cast.
PR Checklist