Rust MEV Bot in 2026: The Alloy, Reth & Artemis Stack

Q: Should I use ethers-rs or alloy for a new Rust MEV bot in 2026?

Always use alloy. ethers-rs has been officially deprecated by its maintainers in favor of alloy, which offers a complete rewrite of Ethereum primitives (alloy-primitives), compile-time Solidity ABI macros (alloy::sol!), faster RLP/ABI serialization, and native compatibility with revm and reth.

Q: What is a Reth Execution Extension (ExEx) and why does it matter for MEV?

A Reth Execution Extension (reth-exex) is a custom Rust module compiled directly into the Reth Ethereum node binary. Instead of querying a node over WebSocket or IPC JSON-RPC, an ExEx receives committed blocks, reorgs, and state transitions directly in-process via Rust channels with zero network or JSON serialization latency.

Q: Can I still use Paradigm's Artemis framework with Alloy?

Yes. While the original paradigmxyz/artemis repository was archived during the ethers-rs era, its core Collector -> Strategy -> Executor trait design is only ~300 lines of Rust code (tokio::sync::broadcast channels). Most modern Rust searchers implement the Artemis actor traits directly on top of alloy-provider and revm.

By Merunas Grincalaitis, founder of MEV DAO and a developer who builds MEV, sniping and trading bots on Ethereum. Last updated: October 2026.

TL;DR: Building a competitive Rust MEV bot on Ethereum in 2026 relies on four core crates: alloy (which permanently replaced the deprecated ethers-rs library for ABI encoding, providers, and signers), revm (for sub-millisecond in-memory EVM state simulation), reth (specifically Reth Execution Extensions / ExEx for zero-IPC-latency access to pending state and blocks), and an actor pipeline inspired by Paradigm's Artemis (Collector → Strategy → Executor).

If you are architecting a low-latency Rust MEV bot in 2026, half the blog posts and rust mev bot github repositories you find online are already obsolete—because they still import ethers-rs (which was officially deprecated by Paradigm/Ithaca) and query external nodes over sluggish JSON-RPC websockets.

When every millisecond between a pending mempool transaction arriving and your bundle reaching Titan Builder or Flashbots determines whether you win the auction, your Rust stack matters enormously. Here is the exact 2026 engineering blueprint for an alloy mev searcher stack using Alloy, Reth (ExEx), revm, and Artemis-style actors.

The 2026 Rust MEV bot stack vs. the legacy 2022–2023 stack

Before writing your Cargo.toml, see how every layer of a production Ethereum Rust MEV bot has evolved over the last three years:

Architecture Layer	Legacy Rust Stack (2022–2023)	Modern 2026 Rust MEV Stack	Latency & Performance Gain
Ethereum Types, ABI & RPC (`alloy mev`)	`ethers-rs` (Deprecated)	`alloy` (`alloy-primitives`, `alloy-sol-types`, `alloy-provider`)	3x–10x faster ABI encoding/decoding via compile-time `sol!` macro; zero heap bloat.
Node Ingestion & State Access	External Geth node over WebSocket / IPC	Reth Node + Execution Extensions (`reth-exex`) + `reth-db` MDBX direct read	0 ms serialization overhead—your bot runs inside the node process or reads shared memory directly!
Bundle & Swap Simulation	Calling `eth_callBundle` over HTTP/IPC (`5–50 ms`)	Embedded `revm` with `CacheDB<RethDatabase>` (`50–300 µs`)	Simulate 1,000+ multi-hop arbitrage paths per slot in microseconds.
Pipeline Orchestration	Ad-hoc `tokio::spawn` channels	Artemis Actor Pattern (`Collector → Strategy → Executor` over `tokio::sync::broadcast`)	Clean separation of mempool ingestion, strategy math, and multi-builder fan-out.
On-Chain Executor Contract	Solidity `UniswapV2Router` wrapper	Custom Yul / Huff / Solady compact-calldata executor	35%–50% lower gas usage, directly increasing your effective `bundleGasPrice`.

If you want to browse existing open-source repositories using these patterns, check our curated list in MEV Bot Ethereum GitHub: Best Open-Source Repos (2026) and our own mev-arbitrage-and-liquidation-reference GitHub repo.

Layer 1: Why `alloy` (`alloy-sol-types` & `alloy-primitives`) is mandatory for `alloy mev`

In Rust MEV development, ABI encoding and 256-bit integer math (U256, Address, FixedBytes<32>) happen inside your hottest inner loop. The old ethers-rs library relied on runtime reflection and heavy allocations.

Alloy (alloy::sol!) compiles Solidity interfaces directly into zero-cost Rust structs at compile time:

use alloy::primitives::{address, U256};
use alloy::sol;
use alloy::sol_types::SolCall;

// Compile-time Solidity ABI generation with zero runtime reflection overhead:
sol! {
    #[sol(rpc)]
    interface IUniswapV2Pair {
        function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
        function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    }
}

fn encode_fast_swap(amount0: U256, amount1: U256, executor: alloy::primitives::Address) -> Vec<u8> {
    let call = IUniswapV2Pair::swapCall {
        amount0Out: amount0,
        amount1Out: amount1,
        to: executor,
        data: Default::default(),
    };
    call.abi_encode()
}

Because alloy-primitives is shared natively by both revm and reth, you never have to convert U256 or Address types when passing decoded transactions from your Reth mempool stream into your revm simulator!

Layer 2: Reth Execution Extensions (`ExEx`) vs. IPC WebSockets

Traditionally, a Rust MEV bot ran as a separate binary that connected to a local Geth or Reth node over a Unix domain socket (/tmp/reth.ipc), subscribing to eth_subscribe("newPendingTransactions") and newHeads.

Even over local IPC, serializing JSON-RPC strings and making eth_getStorageAt calls for every pool tick adds milliseconds of delay. With Reth (paradigmxyz/reth), you have two vastly faster options:

Direct MDBX Read-Only Database Access (reth-db): Because Reth stores chain state in a memory-mapped MDBX database on local NVMe storage, your Rust bot process on the same bare-metal Linux server can open the MDBX environment in read-only mode and read any contract storage slot (Sload) directly from memory pages in nanoseconds—without making a single RPC call!
Reth Execution Extensions (reth-exex): Reth lets you compile your MEV indexing and strategy logic directly into the Reth node binary as an Execution Extension (ExEx). Every time Reth commits a new block or updates canonical state, your ExEx receives the exact ChainCommitted state diff bundle in-memory (Arc<Chain>) with zero serialization overhead.

Layer 3: Microsecond bundle simulation with embedded `revm`

Instead of sending a candidate bundle over HTTP to relay.flashbots.net (eth_callBundle—see Simulate a Flashbots Bundle With eth_callBundle), a production Rust MEV bot embeds revm directly inside its Strategy worker threads:

Wrap your local Reth state provider inside revm::db::CacheDB.
When a target pending transaction tx_victim arrives from the mempool, clone the CacheDB fork in memory (takes microseconds), execute tx_victim inside revm::Evm, and inspect the emitted logs (Sync, Swap) or modified storage slots.
Run your solver (e.g., golden-section search or Newton-Raphson across Uniswap V2/V3/Curve math) against the post-tx_victim CacheDB state to find the exact input amount that maximizes profit.
Execute your signed tx_backrun inside the same revm instance to verify coinbaseDiff > min_profit and confirm tx_backrun does not revert.

We walk through the economic math of DEX arbitrage sizing in How to Build a Profitable MEV Arbitrage Bot and local fork validation in How to Test an MEV Bot on a Mainnet Fork With Anvil.

Layer 4: Modernizing the Artemis (`Collector → Strategy → Executor`) pipeline

Paradigm's open-source artemis repository remains the cleanest architectural blueprint for organizing a Rust MEV bot, once you swap its old ethers-rs dependencies for alloy:

Collectors: One async task listens to Reth's pending transaction pool (TransactionPool), a second listens to new block headers/payloads, and a third subscribes to mev-share / MEV Blocker orderflow SSE streams.
Strategies: Stateful workers receive Event messages, update their in-memory pool graph (petgraph or flat arena arrays), simulate candidate bundles in revm, and emit SubmitBundleAction payloads.
Executors: Non-blocking HTTP/2 clients (reqwest with pre-warmed TLS connection pools) sign the X-Flashbots-Signature header and fan the bundle out in parallel to Titan Builder, Beaverbuild, Flashbots, and Rsync.

Should you build your own Rust MEV bot or hire an experienced team?

Writing a toy Rust script that decodes a Uniswap swap takes a weekend. Building a production-grade alloy + reth + revm searcher with a custom Yul executor contract, multi-hop V2/V3/V4 tick math, and reliable multi-builder bundle management takes months of full-time systems engineering.

If you are looking for ready-to-run Ethereum Block 0 launch sniping or compromised wallet token rescue, you can use our production bots immediately inside the MEV DAO membership.
If you are a trader, fund, or protocol looking to commission a proprietary Rust + Solidity MEV bot (arbitrage, liquidations, Uniswap V4 hooks, or cross-venue stat-arb), see our engineering scope at Custom MEV Bot Development: Hire an Ethereum MEV Bot Developer and our pricing breakdown in MEV Bot Development Cost: Custom Pricing in 2026.

Frequently asked questions

Why do most Ethereum searchers write MEV bots in Rust instead of Python or TypeScript?

Rust compiles to native machine code with no garbage collector, giving predictable sub-millisecond tail latency. More importantly, Ethereum's fastest execution client (Reth), its fastest EVM simulator (revm), and its modern type library (alloy) are all written natively in Rust—allowing a Rust MEV bot to simulate thousands of state transitions per second directly in memory.

Should I use `ethers-rs` or `alloy` for a new Rust MEV bot in 2026?

Always use alloy. ethers-rs has been officially deprecated by its maintainers in favor of alloy, which offers a complete rewrite of Ethereum primitives (alloy-primitives), compile-time Solidity ABI macros (alloy::sol!), faster RLP/ABI serialization, and native compatibility with revm and reth.

What is a Reth Execution Extension (`ExEx`) and why does it matter for MEV?

A Reth Execution Extension (reth-exex) is a custom Rust module compiled directly into the Reth Ethereum node binary. Instead of querying a node over WebSocket or IPC JSON-RPC, an ExEx receives committed blocks, reorgs, and state transitions directly in-process via Rust channels with zero network or JSON serialization latency.

Can I still use Paradigm's Artemis framework with Alloy?

Yes. While the original paradigmxyz/artemis repository was archived during the ethers-rs era, its core Collector -> Strategy -> Executor trait design is only ~300 lines of Rust code (tokio::sync::broadcast channels). Most modern Rust searchers implement the Artemis actor traits directly on top of alloy-provider and revm.

How much does a bare-metal server cost to run a Reth + Rust MEV bot?

To run a full Reth execution node + Lighthouse consensus client + an in-memory Rust MEV bot with low latency, budget $350 to $800/month for a dedicated bare-metal server with an AMD Ryzen 9 / EPYC CPU, 128GB–256GB DDR5 RAM, and 4TB NVMe RAID0 storage located in US-East (Virginia) or EU-Central (Frankfurt) near major builder relays.

Related guides

Want to use MEV DAO's live Ethereum bots today or hire us to build a custom Rust (Alloy + Reth + revm) searcher for your strategy? Start a 3-day free trial at mevdao.org/subscribe, or message me directly on Telegram (@merunas).