EVM Version Checker

Solidity probe contracts to detect supported EVM versions by testing opcodes and precompiles on EVM chains.

How It Works

Each probe contract uses opcodes or precompiles introduced in a specific EVM version. When deployed to a chain:

• Success → The chain supports that EVM version
• Revert → The chain doesn't support the required opcodes/precompiles

Probes

Version	Opcodes/Precompiles	Probe
London	BASEFEE	BasefeeProbe.sol
Shanghai	PUSH0	Push0Probe.sol
Cancun	MCOPY, TSTORE, TLOAD, BLOBBASEFEE, BLOBHASH	McopyProbe.sol, TransientStorageProbe.sol, BlobProbe.sol
Prague	BLS12-381 precompiles (0x0B-0x11)	Bls12381Probe.sol
Osaka	CLZ	ClzProbe.sol

Usage

pnpm install
pnpm build

Check a single chain

tsx src/main.ts check <rpc-url>

Prints EVM version support to the console.

Check all chains

tsx src/main.ts all [--format html|md|json]

Checks all chains from viem/chains and writes results to results-<timestamp>.<ext>.

• html (default) — HTML table
• md — Markdown table
• json — Machine-readable JSON

Tests

pnpm test

Requires Docker. Spins up Anvil at each hardfork and verifies all probes behave correctly.

Requirements

• Foundry (for Solidity compilation)
• Node.js 18+
• pnpm