Most of us assume that blockchain transactions follow a “first come, first served” rule. You send your transaction to Polygon PoS, and it gets processed in the order it was received. However, as I spent more time working on About RizeGate, I learned that this isn’t exactly true.

There is a hidden layer where people can choose the order of transactions to make a profit. This profit is called Maximal Extractable Value, or MEV. In simple terms, it is the extra value that can be squeezed out of a block by including, excluding, or reordering the transactions inside it.

The Simple Analogy: The Ticket Line Jumpers

Imagine you are standing in a long line at a stadium to buy a limited-edition concert ticket for $100. You are next in line. Just as you reach the window, a “Line Jumper” whispers to the ticket seller, “I’ll give you $10 if you let me buy my ticket before that person.”

The seller agrees. The Jumper buys the ticket for $100 and immediately turns around to sell it to someone else for $150. By the time you get to the window, the $100 tickets are gone, and you are forced to buy a more expensive one. The Jumper made a profit, the seller got a tip, and you—the honest person in line—ended up paying more. In the digital world, the “seller” is the Validator, and the “Line Jumper” is an MEV searcher.

How It Works: The Battle in the Mempool

When you hit “send” on a transaction, it doesn’t go straight into a block. It goes into a waiting room called the “Mempool.” This is where MEV happens:

First, specialized bots called “Searchers” watch the Mempool 24/7. They look for opportunities, such as a large trade on a DEX that will move the price.

Second, when they find an opportunity, they submit their own transaction with a higher gas fee. They might use a Flash Loan to get the capital they need instantly.

Finally, the Bor engine on Polygon includes these transactions in the specific order that pays the most to the network. You can often see the results of this reordering by looking closely at transaction histories on PolygonScan.

Why It Matters: Your Invisible Tax

For a beginner, MEV often feels like an “invisible tax.” When you try to swap tokens and your Slippage is set too high, an MEV bot might “sandwich” your trade—buying right before you and selling right after you. This leaves you with a slightly worse price than you deserved.

However, MEV isn’t all bad. It helps keep prices consistent across different platforms and ensures that Lending protocols stay healthy by liquidating risky positions quickly. It’s a complex balance between market efficiency and fairness.

My Honest Thoughts: Is the System Rigged?

Closing Reflection

MEV is a reminder that the blockchain is a living, breathing marketplace. It’s competitive, fast, and sometimes a little bit ruthless. As users, the best thing we can do is stay informed and use tools that protect our trades from being exploited.

Have you ever noticed your “estimated price” change significantly right as you clicked swap? Do you think the ability to reorder transactions is a fair reward for validators, or should it be banned? I’m still navigating these moral gray areas myself, so if you have a different perspective—or if I’ve misinterpreted a technical detail—please let me know in the comments. I’m here to learn alongside you.