# MIP-18: \`CALLSTACKDEPTH\` and \`CALLERN\` Call Stack Introspection Opcodes

**URL:** <https://forum.monad.xyz/t/mip-18-callstackdepth-and-callern-call-stack-introspection-opcodes/556>\
**Category:** MIPs\
**Created:** [September 29, 2026, 1:56pm UTC](https://forum.monad.xyz/t/mip-18-callstackdepth-and-callern-call-stack-introspection-opcodes/556 "2026-09-29T13:56:53Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![baltoli](https://yyz1.discourse-cdn.com/flex035/user_avatar/forum.monad.xyz/baltoli/32/169_2.png) [@baltoli](https://forum.monad.xyz/u/baltoli)\
**Post date:** [September 29, 2026, 1:56pm UTC](https://forum.monad.xyz/t/mip-18-callstackdepth-and-callern-call-stack-introspection-opcodes/556/1 "2026-09-29T13:56:53Z")

</div>

> **[Monad Improvement Proposals](https://mips.monad.xyz/MIPs/MIP-18)**
>
> Monad Improvement Proposals (MIPs)

This MIP proposes two new opcodes that allow-fine grained introspection of the EVM call stack.

---

_[View the full topic](https://forum.monad.xyz/t/mip-18-callstackdepth-and-callern-call-stack-introspection-opcodes/556)._