MEV in Blockchain<\/p>\n
Every time you swap tokens on a DEX, liquidate a loan, or buy an NFT, an invisible middleman silently profits from your transaction. You never see them, never agreed to it, but they extract value. This is MEV<\/strong>\u200a\u2014\u200aMaximal Extractable Value\u200a\u2014\u200aand understanding it separates casual users from people who truly grasp how blockchains work. This is day 21 of my 60 Days in Web3\u00a0series.<\/p>\n Follow my Journey on Future<\/a> | Twitter<\/a> MEV<\/strong> is the maximum amount of value that block producers (miners or validators) can extract by changing the order in which transactions are included, excluded, or reordered in a\u00a0block.<\/p>\n Think of it like\u00a0this:<\/p>\n When you submit a swap transaction to a DEX, your transaction doesn\u2019t execute immediately. It sits in a mempool<\/strong>\u200a\u2014\u200aa public waiting room where all pending transactions are\u00a0visible.<\/p>\n Block producers (validators in Ethereum\u2019s Proof-of-Stake) have the power\u00a0to:<\/p>\n Include your transaction.<\/strong>Exclude your transaction.<\/strong>Reorder your transaction<\/strong> relative to\u00a0others.<\/p>\n Sophisticated bots called \u201csearchers\u201d watch the mempool, spot profitable opportunities, and exploit that power to extract value at your\u00a0expense<\/strong>.<\/p>\n By 2021, MEV extracted on Ethereum alone reached $78 million<\/strong>. By end of 2021, it hit $554 million<\/strong>. Today, it exceeds $686\u00a0million<\/strong>.<\/p>\n That\u2019s not profit going to Ethereum or validators. That\u2019s value being stolen<\/em> from users like\u00a0you.<\/p>\n The most common and easiest-to-understand form of MEV is the sandwich\u00a0attack<\/strong>.<\/p>\n Imagine you want to swap 1 ETH for USDC on Uniswap. Here\u2019s what\u00a0happens:<\/p>\n You send a swap: \u201cGive me USDC for my 1\u00a0ETH.\u201dYour transaction enters the mempool, visible to everyone.<\/p>\n A bot sees your transaction in the\u00a0mempool.It predicts: \u201cWhen this big swap executes, the price of ETH will move. I can profit from\u00a0that.\u201dThe bot submits its own transaction before yours<\/strong> with a higher gas fee to ensure it gets included\u00a0first.That transaction buys a lot of ETH, pushing the price\u00a0up<\/strong>.<\/p>\n Your swap executes, but the ETH price is now higher than when you submitted it.You receive fewer USDC than expected.You think: \u201cWow, I got slippage. That\u2019s just how DEXs\u00a0work.\u201d<\/p>\n The bot immediately sells the ETH it just bought, now at an inflated\u00a0price.The bot captures the difference as\u00a0profit.<\/p>\n Your transaction is \u201csandwiched\u201d between two attacker transactions, and you lose money without ever knowing\u00a0why.<\/strong><\/p>\n MEV isn\u2019t just sandwich attacks. Searchers exploit MEV in multiple\u00a0ways:<\/p>\n A token is priced differently on two\u00a0DEXs.Searcher buys it on the cheaper DEX, sells on the expensive one.Profit = price difference.<\/p>\n This is actually benign<\/strong>\u200a\u2014\u200ait helps keep prices fair across\u00a0markets.<\/p>\n A user\u2019s loan on Aave becomes under-collateralized and needs to be liquidated.Many searchers compete to liquidate it first to earn the liquidation bonus.This is good for the protocol<\/strong> (keeps it solvent) but searchers still extract\u00a0value.<\/p>\n You place a swap that will influence the\u00a0price.A bot places its transaction before yours, benefits from your trade, then\u00a0profits.<\/p>\n This is harmful to\u00a0you<\/strong>.<\/p>\n After your transaction executes, a bot executes a follow-up transaction to capture remaining value.Example: You swap tokens, the price moves, a bot sells into that movement and\u00a0profits.<\/p>\n All transactions are visible in the mempool before they\u2019re confirmed.<\/p>\n This creates a transparency paradox<\/strong>:<\/p>\n Blockchains are transparent (everyone can see transactions).But that transparency becomes a weapon when validators can choose the\u00a0order.<\/p>\n Searchers use:<\/p>\n Complex algorithms<\/strong> to spot profitable patterns in pending transactions.High gas fees<\/strong> to outbid normal transactions and ensure their transaction goes in\u00a0first.Bots<\/strong> that run 24\/7 to catch every opportunity.<\/p>\n It\u2019s like front-running in traditional finance, except on a blockchain it\u2019s automated, continuous, and unavoidable<\/strong> (unless you use special protections).<\/p>\n This is not theoretical. Real users lose real money to MEV every single\u00a0day.<\/p>\n You want to swap 10 ETH for\u00a0USDC.Without MEV, you\u2019d get 30,000 USDC (assuming $3,000\/ETH).A sandwich attack\u00a0happens.You end up getting 28,500\u00a0USDC.You lose $1,500<\/strong> to\u00a0MEV.<\/p>\n Across millions of transactions, this adds up to hundreds of millions per\u00a0year<\/strong>.<\/p>\n You feel the slippage but think it\u2019s normal DEX behavior.You don\u2019t realize a bot just extracted value from\u00a0you.Your wallet shows fewer tokens, but you don\u2019t see where they\u00a0went.<\/p>\n MEV isn\u2019t entirely bad\u200a\u2014\u200athere\u2019s a nuanced\u00a0side:<\/p>\n Rapid liquidations keep protocols solvent.<\/strong> If a loan needs liquidation, competition among searchers means it happens\u00a0fast.Arbitrage improves price efficiency<\/strong> across\u00a0DEXs.<\/p>\n Users get worse prices than they should.<\/strong> Sandwich attacks inflate slippage.Trust in DEXs decreases.<\/strong> If users know they\u2019re being robbed by bots, they avoid on-chain\u00a0trading.Network centralization risk.<\/strong> Large validators\/searchers partnerships can dominate MEV, reducing decentralization.Consensus instability.<\/strong> If MEV exceeds block rewards, validators might be incentivized to reorder previous blocks to extract more\u00a0MEV.<\/p>\n The bottom line: MEV helps the protocol, hurts regular\u00a0users.<\/strong><\/p>\n If you\u2019re a user swapping tokens, here are real, practical ways to reduce MEV exposure:<\/p>\n On Uniswap, go to swap settings and set slippage to 0.5%<\/strong> instead of the default\u00a01%.If the price moves more than that, your transaction won\u2019t\u00a0execute.This caps your MEV losses but might cause failed swaps during volatile\u00a0markets.<\/p>\n Trust Wallet<\/strong><\/a> has built-in MEV protection enabled by\u00a0default.Flashbots Protect<\/strong><\/a> is a private RPC that hides your transaction from\u00a0bots.Your transaction is sent to a private mempool instead of the public\u00a0one.Bots can\u2019t see it, so they can\u2019t sandwich\u00a0you.Protected >27M transactions to date with >400 ETH in gas\u00a0refunds.<\/p>\n The higher your slippage tolerance (e.g., 5%), the more profit a sandwich attacker can\u00a0extract.Keep it\u00a0low.<\/p>\n Limit orders execute only at a price you\u00a0specify.They\u2019re immune to sandwich attacks because the attacker can\u2019t move the price enough to make a difference.<\/p>\n If you\u2019re building a DeFi protocol or DEX, MEV is a design consideration, not an afterthought<\/strong>.<\/p>\n Questions to\u00a0ask:<\/p>\n How will my protocol handle liquidations\u200a\u2014\u200afairly or in a way that attracts MEV searchers?Should I use a MEV-resistant consensus<\/strong> mechanism?Can I implement private mempools<\/strong> or encrypted transactions<\/strong> so pending trades aren\u2019t\u00a0visible?Should I use MEV-Burn<\/strong> (destroy MEV rather than let validators keep it) to disincentivize extraction?<\/p>\n These decisions affect user experience, fairness, and adoption<\/strong>.<\/p>\n The Web3 community is working on\u00a0fixes:<\/p>\n Flashbots Protect<\/a> hides transactions until confirmation.If your transaction is invisible, bots can\u2019t sandwich\u00a0you.<\/p>\n Some protocols destroy MEV rewards instead of giving them to validators.This removes the incentive to extract MEV in the first\u00a0place.<\/p>\n Transactions are encrypted until they\u2019re in a\u00a0block.Even validators can\u2019t see pending transactions, so they can\u2019t reorder them maliciously.<\/p>\n Transactions are revealed only after block inclusion, making reordering impossible.<\/p>\n These are experimental, but they represent the direction: making MEV extraction harder or impossible<\/strong>.<\/p>\n MEV is the \u201cinvisible tax\u201d that sophisticated bots extract from every DEX swap, liquidation, and arbitrage opportunity you execute on a blockchain.<\/strong> Sandwich attacks\u200a\u2014\u200awhere your transaction is ordered between two attacker transactions to exploit price movement\u200a\u2014\u200acost users hundreds of millions per year. While MEV can help protocols (liquidations, arbitrage), it harms regular users<\/strong> by causing worse prices and hidden losses. As a user, protect yourself with low slippage tolerances and MEV-protected wallets like Flashbots Protect or Trust Wallet; as a developer, treat MEV as a design problem that affects user experience and fairness.<\/p>\n Chainlink Education Hub\u200a\u2014\u200aMaximal Extractable Value (MEV)<\/strong><\/a>\u200a\u2014\u200aComprehensive overview of MEV pros and\u00a0cons.Flashbots\u200a\u2014\u200aMEV Protection Overview<\/strong><\/a>\u200a\u2014\u200aOfficial documentation on using Flashbots Protect to defend against\u00a0MEV.Trust Wallet\u200a\u2014\u200aWhat Are Sandwich Attacks in DeFi?<\/strong><\/a>\u200a\u2014\u200aDetailed guide on sandwich attacks with real examples.Gemini Cryptopedia\u200a\u2014\u200aUnderstanding Maximal Extractable Value<\/strong><\/a>\u200a\u2014\u200aBeginner-friendly breakdown of MEV concepts.<\/p>\n Learning in public, Day 21 complete \ud83d\ude80<\/strong> MEV (Maximal Extractable Value): The Invisible Tax on Every Blockchain Transaction<\/a> was originally published in Coinmonks<\/a> on Medium, where people are continuing the conversation by highlighting and responding to this story.<\/p>","protected":false},"excerpt":{"rendered":" MEV in Blockchain Every time you swap tokens on a DEX, liquidate a loan, or buy an NFT, an invisible middleman silently profits from your transaction. You never see them, never agreed to it, but they extract value. This is MEV\u200a\u2014\u200aMaximal Extractable Value\u200a\u2014\u200aand understanding it separates casual users from people who truly grasp how blockchains […]<\/p>\n","protected":false},"author":0,"featured_media":123367,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-123366","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interesting"],"_links":{"self":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/123366"}],"collection":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=123366"}],"version-history":[{"count":0,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/123366\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/media\/123367"}],"wp:attachment":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=123366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=123366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=123366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Join Web3 for Humans<\/a> on Telegram!<\/p>\n1. What is MEV? (The invisible tax)<\/h3>\n
2. How MEV works: The sandwich\u00a0attack<\/h3>\n
Step 1: You submit your transaction<\/h3>\n
Step 2: The attacker sees it (frontrunning)<\/h3>\n
Step 3: Your transaction executes (at a worse\u00a0price)<\/h3>\n
Step 4: The attacker profits (backrunning)<\/h3>\n
3. Types of MEV extraction<\/h3>\n
a) Arbitrage<\/h3>\n
b) Liquidations<\/h3>\n
c) Front-running<\/h3>\n
d) Back-running<\/h3>\n
4. Why MEV happens (The mempool\u00a0problem)<\/h3>\n
5. Real impact: How much value are users actually\u00a0losing?<\/h3>\n
Example: Sandwich attack on\u00a0Uniswap<\/h3>\n
The insidious part<\/h3>\n
6. Pros and cons of\u00a0MEV<\/h3>\n
Pros (surprisingly)<\/h3>\n
Cons (the real\u00a0problem)<\/h3>\n
7. How to protect yourself from\u00a0MEV<\/h3>\n
a) Set a slippage\u00a0limit<\/h3>\n
b) Use MEV-protected wallets<\/h3>\n
c) Avoid high slippage tolerances<\/h3>\n
d) Use limit orders instead of market\u00a0orders<\/h3>\n
8. Why this matters for developers<\/h3>\n
9. The future: MEV-resistant solutions (What\u2019s being\u00a0built)<\/h3>\n
a) Private transaction pools<\/h3>\n
b) MEV-Burn<\/h3>\n
c) Encrypted mempools<\/h3>\n
d) Threshold encryption (emerging)<\/h3>\n
10. Key\u00a0takeaway<\/h3>\n
Further resources &\u00a0readings<\/h3>\n
Follow my Journey on Future<\/a> | Twitter<\/a>
Join Web3 for Humans<\/a> on Telegram!<\/p>\n