MevLex arbitrage bot — the complete guide
What the bot actually does, how it runs on a 1-Year License versus the Full Source Code, how it is funded and risk-controlled, and answers to the questions we hear most. Read it end to end before you buy — everything here is verifiable on-chain.
A full video tutorial comes with every plan
When you buy the 1-Year License or the Full Source Code, you also receive a complete step-by-step video walkthrough — setup, wallet, configuration, and going live — delivered with your purchase. You are never left to figure it out alone.
What you are running
MevLex is an on-chain arbitrage bot for Ethereum mainnet. It continuously watches prices across the major DEXs — Uniswap V2/V3, SushiSwap, Curve, Balancer and PancakeSwap — and when the same asset is priced differently across venues, it buys low and sells high in a single atomic bundle. Because it is arbitrage, it does not target any individual trader; it simply closes the gap between markets.
Every opportunity is funded whichever way nets more after gas: from the operator wallet’s own capital (no flash-loan fee, so it keeps the full spread) or with a flash loan from Balancer (0%), Aave V3 (0.05%), Uniswap V3 or Maker (no upfront capital at risk). The assembled bundle is simulated against live state, then submitted directly to block builders — beaverbuild, Titan, rsync-builder, BuilderNet, Quasar — and lands on-chain as a public, verifiable transaction. The two arbitrage executor contracts (Arbitrage v1.0 and v2.0) are deployed and source-verified on Etherscan.
Running it on a 1-Year License (managed)
The License is the fastest way to run MevLex. The bot lives on our low-latency infrastructure, peered directly with block builders, and the desktop app (macOS and Windows) is your control panel — your machine only needs to be online to command it. You sign in with your account, connect the operator wallet that signs the bot’s bundles (its private key stays local to the app), and attach to the already-deployed MevLex contracts with a single click. There is nothing to compile, deploy, or host.
From there you set the strategy guards — which venues and routes to use, your minimum spread, maximum slippage, and minimum net profit — choose how each trade is funded (own capital, flash loan, or automatic), and pick the builders you want to submit to. Turn on server-side running and the bot keeps working around the clock after you close the app. A live journal shows every bundle it submits and lands, each linked to its Etherscan transaction. The License renews yearly.
Running it with the Full Source Code
The Full Source Code is a one-time purchase for people who want to own the whole bot. Within 24 hours of order approval you receive a private repository invite to the email on your account, plus a one-time signed download for a self-contained tarball. Inside, the docs/ directory documents the contract architecture, the off-chain bot, the deployment scripts, and a maintainer’s how-to.
You can run it two ways: self-host it on your own machine or server, or have MevLex host your instance for you. Either way our low-latency Ethereum nodes are included — you never supply your own RPC — and you only need a wallet with a little ETH for gas. You deploy your own copy of the arbitrage executor from your operator wallet using the included script, and the desktop app — which you keep for life with this purchase — reads the deployed address back and wires it in. From then on you run the same strategy engine as the managed service, and the code is yours to modify: add venues, change the routing, tune the funding logic.
Funding, strategy & risk controls
Whichever plan you run, the controls are the same. Strategy: cross-DEX, triangular and multi-hop routes, including JIT liquidity within an arbitrage route, across the major venues. Funding: own capital versus flash loan, decided per trade to maximise net profit. Submission: choose your builders and orderflow, with every candidate simulated before it can be sent. Risk: a minimum profit per bundle, a maximum gas price, and daily-loss and per-trade caps that pause the bot automatically if hit — so it never exceeds the limits you set.
Frequently asked questions
Do I need coding experience to run it?+
No. With the 1-Year License everything runs from the MevLex desktop app — you connect a wallet, choose your settings, and press start. The Full Source Code is for people who want to own and modify the code — you can self-host it or have us run it on our servers, and our low-latency nodes are included either way.
Is there a video tutorial?+
Yes. Every purchase — License or Full Source Code — includes a complete step-by-step video tutorial covering setup, configuration, and going live. It is delivered with your purchase, so you are never left guessing.
What exactly do I get with the 1-Year License?+
A year of running the managed MevLex arbitrage bot: it operates on our low-latency infrastructure, and you command it from the native desktop app (macOS and Windows). You attach it to the deployed, on-chain MevLex contracts with one click — there is nothing to compile or deploy. It renews yearly.
What exactly do I get with the Full Source Code?+
A one-time purchase that delivers the Solidity arbitrage contracts, the off-chain bot, and the deployment scripts as a private repository invite plus a signed download, within 24 hours of order approval. You can run it on your own infrastructure or have MevLex host it on our servers, and modify it freely. Our low-latency Ethereum nodes are included, so you never have to supply your own. It also includes lifetime access to the desktop app.
How is a License different from the Source Code?+
The License is a yearly rental of the managed bot — we run the servers, you control the bot, and it attaches to our deployed contracts. The Source Code is a one-time purchase that you own and can modify — self-host it or have us host it on our servers, with our nodes included either way. The License is faster to get live; the Source Code gives you full ownership and the ability to change the strategy.
What infrastructure do I need?+
On the License, none beyond a computer to run the app — execution happens on our servers. On the Source Code, our low-latency Ethereum nodes are included, so you do not need to supply your own RPC — you just need a wallet with a little ETH for gas. Prefer not to manage anything? We can host your instance on our servers.
How does it make money without hurting anyone?+
It runs on-chain arbitrage: it buys where a token is cheaper and sells where it is more expensive across DEXs, in one atomic bundle. Unlike sandwiching, arbitrage does not target a specific user — it just closes price gaps between venues. Each opportunity is funded from the bot’s own capital (no fee) or a flash loan (no upfront capital), whichever nets more after gas.
Can I verify it is real before I buy?+
Yes. The MevLex arbitrage contracts — Arbitrage v1.0 (0x0000…120E49) and Arbitrage v2.0 (0x8146…5b5128) — are deployed and source-verified on Etherscan, and every bundle the bot lands is a public transaction you can inspect. Watch the live execution feed on the site and copy any hash into Etherscan.
What if a trade would lose money?+
Every candidate is simulated against live chain state before submission, and the net profit is computed after gas, builder payment, and any flash-loan fee. Anything below your configured minimum-profit floor is dropped and never submitted. You also set a daily loss cap and per-trade limits that hard-stop the bot.
How do I get support?+
Use the live chat on this site (sign in so it is saved to your account), email support@mevlex.com, or open a ticket from your dashboard. Support is included with every plan.
Can I get a refund?+
Yes — there is a 30-day money-back guarantee. See the Refund Policy for full eligibility.
Ready to run it?
Pick a 1-Year License to run the managed bot, or the Full Source Code to own it — self-host or let us host it, nodes included. Both come with the full video tutorial. New to MEV? Read what a MEV bot is first.
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