Extropy.io
@Extropy
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A blockchain consultancy based in Oxford, specialising in developing blockchain solutions, security auditing, training & more.
Oxford, England
Joined March 2017
Most people don't fully understand #MEV In reality, it’s an entire ecosystem shaping who wins and loses onchain. Today we’re launching a new course: 🎓 Advanced MEV: Navigating the Dark Forest https://t.co/gxatMJ8ONo 🧵 Here’s what you’ll learn:
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Extropy Academy small update, big usability win: Resources → Explore by Topic. It’s basically the “show me the good stuff” button. ✅ https://t.co/uNpWo5Oj8T
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We’re bringing back live sessions in early 2026 with @extropyLaurence. Which topic should we dive into next? Vote below or if you’d pick something else, drop it in the replies.
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Moon Math, but literal: we’re learning ZKPs with an 8-stop tour of the Moon. 🌖
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MEV arbitrage in 2025 isn’t “write a bot.” It’s market design: - Ethereum sells ordering via sealed-bid block auctions. - Solana turns it into a latency race with off-chain tips. - Optimism/Base rewards flooding the sequencer with duplicates. - Starknet’s ZK + Cairo creates a
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If you want to see x402 in action, we’re using it on the Extropy Security site home page – you can try a live payment flow there:
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Tired of API keys and awkward subscription billing for your AI apps? Our new developer guide shows how x402 turns HTTP 402 into a real payment rail: one line of middleware, an on-chain pay-per-request flow, and EIP-3009 for gasless micropayments. ✅ https://t.co/9dRZhx4r8b
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This week in Web3 security: Legacy math mints 235T yETH out of thin air A proxy gets hijacked with a “shadow” implementation Law turns freeze-and-seize into a feature, not a bug 🤿 Dive into our Week 49 Security Roundup for lessons from each incident.
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“Approve + transferFrom” is one of the worst UX patterns in Web3. EIP-3009 (“Transfer With Authorisation”) fixes this with gasless, relayer-based transfers that are already live in USDC and ideal for machine-to-machine payments. We break down how it works and why it matters:
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If you’ve been hearing “Fusaka” recently but haven’t had time to dig in… this 35s recap is the best way to catch up. 👇
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If your idea of a good holiday is a notebook, a quiet corner, and some serious brainfood… You’re going to like what we’re dropping before the year is out. 🤔🌚📕 more soon...
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MEV isn’t a side-effect anymore, it is the scaling bottleneck. In our State of MEV Research Q4 2025 we break down: • ePBS & the Free Option problem • The “MEV spam wall” on high-throughput L2s • TEEs vs Based rollups • Why block building is now constrained by geography +
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Week 48 was all about operational failure, not smart contract bugs. Dormant political scam wallets pivoted into SOL, a “payment” protocol rugged itself via EIP-7702, a hyped L2 mis-handled its own Safe, and Korea’s largest exchange found its wallet architecture fundamentally
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The zkML Singularity isn’t a metaphor anymore. In our latest piece, we map the moment where: – 13B-parameter models can be proven in <15 minutes – Ethereum L1 blocks can be proven in <12s on consumer GPUs – zk stacks unbundle into proving markets, verification chains &
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The problem with most “AI auditors”? They verify code, but don’t understand intent. Our new article explains how we’re using AI agents + a real-time Knowledge Graph of adversarial behavior to scale human intuition instead of replacing it. https://t.co/P2XBhRf1WB
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Why isn’t your “plug-and-play” arbitrage bot printing money? In today’s MEV battlefield, public bots are just easy prey -- slow, predictable, and front-runnable. We break down why off-the-shelf bots lose, and what professional searchers do differently 👇 https://t.co/jkO51FJLHc
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Love seeing high-quality Ethereum education stay open and accessible. Mastering Ethereum (2nd ed.) is available for free on GitHub – a full book on the protocol, EVM, and smart contracts: https://t.co/KLwLSn2Ns4 Huge thanks to everyone who keeps resources like this alive for
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Last week was a breeze. This week is a storm. In Security Bytes week 47 we cover: • Stream + Elixir’s recursive “stablecoin” collapse • Cloudflare taking 20% of the internet down • Aerodrome / Velodrome DNS hijacks • A fake “Safery” wallet using Sui as a malware dead drop •
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