Technical Lead @CoWSwap. Multi-dimensional Batch Auctions with Uniform Clearing Prices on Ethereum. Prev. @gnosisPM, @facebook, @google. @HPI_DE Alumnus.

Joined August 2012
47 Photos and videos
Felix Leupold retweeted
Defi legos at work: This morning Fractal settled an @aave debt swap through @CoWSwap using flashloans. The swap routed through 2 @titanbuilderxyz propamms (bopamm and fermiswap) etherscan.io/tx/0xb15f7a5275…
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Felix Leupold retweeted
Here is the root cause of the current Gnosis Pay incident. Several other projects are affected. We tried to inform everyone privately in advance, but if you haven’t heard yet and are using a Zodiac module — Delay or Roles — please urgently check whether you are affected 👇
Community Notice: Zodiac Roles Modifier v2 and Delay Modifier v1.1.0 — Security Update We identified a vulnerability in two Zodiac modules: Roles Modifier v2 and Delay Modifier v1.1.0. It affects only accounts where one of these modules is enabled AND a Safe account with a vulnerable fallback handler is itself assigned as a module or role member to the affected module. Safe smart contracts, Safe{Wallet} infrastructure & UI are not affected. Other Zodiac modules and setups are also not affected. We've been working directly with affected users since identifying the issue. Over 95% of identifiable accounts have already resolved it. If you have either module enabled and have not yet acted, check your account and follow the steps: app.zodiac.eco/public/fallba… We apologize for the disruption and concern this incident has caused. Our team is working as quickly as we can to support affected users and help wherever possible. A full post-mortem will follow. If you have any questions, reach us at security@gnosisguild.org
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Felix Leupold retweeted
Apr 19
We’ll continue monitoring as Vercel’s investigation progresses. We have no indication CoW Swap was among the impacted customers. However, we still completed all recommended remediation steps: ✅ Rotated all tokens ✅ Audited deployments -> no malicious code ✅ Reviewed activity logs -> no suspicious access CoW Swap is safe to use.
Apr 19
We’ve identified a security incident that involved unauthorized access to certain internal Vercel systems, impacting a limited subset of customers. Please see our security bulletin: vercel.com/kb/bulletin/verce…
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Felix Leupold retweeted
Apr 16

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Felix Leupold retweeted
Apr 15
UPDATE: We now have full control of the cow.fi domain. CoW Swap has been working as normal at cow.finance for some time now, and we are now working to transition it back to it's original domain. In the meantime, here is an update on we know about the incident so far and what you should do if you were impacted. 👇🧵
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The CoW Swap frontend is back up at swap.cow.finance. Make sure you only sign approvals to 0xc92e8bdf79f0507f65a392b0ab4667716bfe0110 (the original GPv2VaultRelayer contract)
Apr 14
UPDATE: The swap dot cow dot fi domain is currently locked and not accessible. We are working with security experts to assert control over the domain while it is locked, but we *do not* expect it to be live again tonight. For those who rely on CoW Swap daily, we have spun up a new instance of the CoW Swap UI at swap.cow.finance, which is safe to use. Please continue to exercise extreme caution when interacting with any websites (including the new URL above) or social media accounts purporting to be CoW Swap. Only rely on official communications from this channel or on Discord surrounding the status of CoW Swap.
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One man's “protection” is another man's “patronization”
Counter argument to all the frontend error folks: Imagine a protocol is hacked. You try to swap out the tokens with haste as you know the tokens you hold are worthless. You open the UI and the UI doesn't allow you to swap it for the sake of your safety.
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Felix Leupold retweeted

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Felix Leupold retweeted

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Felix Leupold retweeted
4 Dec 2025
CowSwap is now powering @aave. Swap collateral or debt or repay with collateral, all in a seamless experience and best execution with MEV protection.
4 Dec 2025
Aave Labs is partnering with @CoWSwap to provide an improved swap experience across aave.com. Swaps will now have better prices via CoW Swap's solver and protection against MEV attacks.
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Few people seem to know that there is a @safe module allowing to guard transactions from being executed before a certain timestamp: github.com/schmanu/multisend… H/t @schmanu_
25 Nov 2025
The @megaeth issue is arguably a (known) footgun in Safe. All four signatures were off-chain signatures, but the @safe backend exposes them to anyone, as opposed to only other signers. This is a design decision: you don't have to auth the owners, but comes with a tradeoff.
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It’s one of those mornings where you wake up, see there was a crash, and check how much extra $ you made from your @CoWSwap limit entry bids getting executed better than their limit price 🤌 Only place where a “limit order” can mean more than you asked for.
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« You cannot create a backdoor that only lets the “good guys” in. » Let alone tell who the good guys are these days.
3 Oct 2025
We are alarmed by reports that Germany is on the verge of a catastrophic about-face, reversing its longstanding and principled opposition to the EU’s Chat Control proposal which, if passed, could spell the end of the right to privacy in Europe. signal.org/blog/pdfs/germany…
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It's to explain MEV protection in an intent based solver competition and the price advantages that not crossing the spread when settling a multi dimensional batch auction with uniform price clearing brings to the average crypto user in one word.
bro why does cowswap moo and balancer ring a gong every time i swap you guys cant be serious
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Great work by the whole team - from research through development to making a smooth transition in production! @CoWSwap just got the biggest mechanism upgrade since inception and is now faster and fairer for all.
18 Jun 2025
🧵 CoW Protocol just got a major upgrade. Say hello to Fair Combinatorial Batch Auctions (FCBAs) - the smartest, fastest, and fairest way to trade on-chain. It's not just an upgrade. It's a whole new standard for DEXs. Here's what you need to know: 👇
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Probably the most ambitious project from @GnosisDAO yet. If money is just social coordination, why not use your actual social circle to create your own IOUs and use them as money. Will probably take some more time for people to get, but imo a very interesting experiment...
21 May 2025
Introducing Circles — an ambitious experiment on money. For the first time ever, you can create your own money without needing a bank or a government. 🧵
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Paradigm preparing to become a solver…
paradigm puzzle #1 AAMM: the AAMM Automated Market Maker problem statement in reply
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Felix Leupold retweeted
@CoWSwap voted in a $ 10k bounty to integrate CoW AMM into Tycho. We're forwarding 100% of it to a Tycho community bounty. Integrate CoW AMM pools with LP swaps and win the bounty. Let's bring better liquidity to more traders on CoW Swap 🐄! Github issue: github.com/propeller-heads/t…
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Felix Leupold retweeted
14 Jan 2025
The collaboration begun deeeeep in the bear market with a simple idea: CowSwap’s auctions could be leveraged as a tool for Curve’s DAO to claim fees in crvUSD; coincidentally Curve just burned approximately $ 0.5 million in fees today via Cowswap! It was a good experience brainstorming with Cowswap heavyweights.
1/🧵 Deep dive into how @CurveFinance leverages @CoWSwap for its revolutionary fee burning process. A story of innovation, efficiency, and MEV protection that's processed over $6.5M in fees across 227 different tokens! #DeFi #Crypto github.com/curvefi/curve-bur…
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Felix Leupold retweeted
🚢 Shippingday - v0.10.26 live on all 3 app stores! Your wallet can now send bank transfers to anyone - even if they've never heard of crypto! Pay rent, bills, or friends directly from your wallet to their bank. Powered by @monerium, making your onchain wallet a true peer to your bank account Update Now and Carry On 👑
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