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Updates to MIP-3 #8

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Merged
Baltoli merged 1 commit into from
Jan 29, 2026
Merged

Updates to MIP-3 #8

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14 changes: 10 additions & 4 deletions MIPS/MIP-3.md
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ Memory expansion cost is redefined as:

```python
memory_size_words = (memory_byte_size + 31) // 32
memory_cost = 3 * memory_size_words
memory_cost = memory_size_words // 2
```

The max memory usage is capped at 8 MB. Memory allocation is bounded across call contexts with the following rule:
Expand All @@ -38,6 +38,7 @@ The max memory usage is capped at 8 MB. Memory allocation is bounded across cal
```
3. Once a call returns, the memory is returned to the pool.
4. If a call exceeds the remaining memory limit, it reverts.

## Backwards Compatibility

This proposal is highly compatible with existing contracts. Almost all standard EVM operations remain valid and ERC-4337 contracts continue to function correctly, as child call memory is released upon completion. Replay testing of historical Ethereum transactions will be used to quantify compatibility.
Expand All @@ -46,11 +47,16 @@ However, contracts that allocate more than 8 MB of memory will now revert.

## Security Considerations

The cost to expand 8 mb is 1048576 gas. The result is that it is cheaper to expand memory then current costs. Potentially concurrency limits for RPC nodes should be adjusted to prevent OOM issue.
The cost to expand memory to the 8MB ceiling is 131,072 gas. The result is that it is cheaper to expand memory than current costs. Potentially concurrency limits for RPC nodes should be adjusted to prevent OOM issue.

## Acknowledgements

The proposals in this MIP are based on two previous EIP documents. Additionally, conversations with Charles Cooper were instructive in developing the Monad memory model:

## Historical Reference
- [EIP-7686](https://eips.ethereum.org/EIPS/eip-7686) (@vbuterin)
- [EIP-7923](https://eips.ethereum.org/EIPS/eip-7923) (@charles-cooper, @qizhou)

This is thematically similar to Vitalik’s EIP-7686 proposal. The main difference is that EIP-7686 defines a direct relationship between memory limit and gas limit.
MIP-3 differs from EIP-7686 in that EIP-7686 defines a direct relationship between memory limit and gas limit, and from EIP-7923 in that MIP-3 does not adopt the page-based thrashing cost model.

## Copyright

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