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Coinbase Loses $300K in MEV Exploit After Misstep With 0x Swapper Contract

Crypto exchange Coinbase lost roughly $300,000 in token fees after a misconfigured interaction with decentralized exchange protocol 0x’s “swapper” contract allowed MEV bots to siphon funds from one of its corporate wallets.
Coinbase’s chief security officer Philip Martin confirmed the mishap and called it an “an isolated issue” tied to a change in one of the exchange’s corporate DEX wallets. He stressed that no customer funds were affected, per an X post.
Security researcher “deeberiroz” of Venn Network first flagged the exploit on Wednesday, saying Coinbase mistakenly approved tokens to the swapper contract — a permissionless tool designed for executing swaps but not intended to hold token allowances.
That setup opened the door for opportunistic MEV bots, which immediately drained the wallet once approvals were live.
MEV, or “maximal extractable value,” refers to the practice of front-running or reordering blockchain transactions to capture profits, or in this case, executing transfers before Coinbase could revoke access.
“There appears to have been an MEV bot lurking in the dark, waiting for users to mistakenly approve to this contract — and then drain all their funds,” the researcher wrote on X. “Well, their dream came true thanks to Coinbase … They made a killing by draining the Coinbase fee receiver account of all the tokens they gathered.”
Because the contract can be accessed by anyone, the bots were able to call it (a software term requesting services from another program) to transfer out the approved tokens directly to their own addresses.
While $300,000 is immaterial for Coinbase, the breach shows how even leading exchanges are vulnerable to small but sophisticated forms of automated trading exploitation.
MEV bots have long been a fixture in Ethereum and other blockchain ecosystems, profiting from token launches, NFT mints, and liquidity events by exploiting memepool visibility and transaction reordering.
In this case, the bots simply waited for a high-value wallet — like Coinbase’s fee receiver — to mistakenly grant spending rights to an exposed contract, then executed the drain instantly.
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Bank of England’s Proposed Stablecoin Ownership Limits are Unworkable, Says Crypto Group

The Financial Times (FT) reported on Monday that cryptocurrency groups are urging the Bank of England (BoE) to scrap proposals limiting the amount of stablecoins individuals and businesses can own.
The group warned that the rules would leave the UK with stricter oversight than the U.S. or the European Union (EU).
According to the FT, BoE officials plan to impose caps of 10,000 british pounds to 20,000 british pounds ($13,600–$27,200) for individuals and about 10 million british pounds ($13.6 million) for businesses on all systemic stablecoins, defined as tokens already widely used for payments in the U.K. or expected to be in the future.
The central bank has argued the restrictions are needed to prevent outflows of deposits from banks that could weaken credit provision and financial stability.
The FT cited Sasha Mills, the BoE’s executive director for financial market infrastructure, as saying the limits would mitigate risks from sudden deposit withdrawals and the scaling of new systemic payment systems.
However, industry executives told the FT the plan is unworkable.
Tom Duff Gordon, Coinbase’s vice president of international policy, said “imposing caps on stablecoins is bad for U.K. savers, bad for the City and bad for sterling,” adding that no other major jurisdiction has imposed such limits.
Simon Jennings of the UK cryptoasset business council said enforcement would be nearly impossible without new systems such as digital IDs. Riccardo Tordera-Ricchi of The Payments Association told the FT that limits “make no sense” because there are no caps on cash or bank accounts.
The U.S. enacted the GENIUS Act in July, which establishes a federal framework for payment stablecoins. The law sets licensing, reserve and redemption standards for issuers, with no caps on individual holdings. The European Union has also moved ahead with its Markets in Crypto-Assets Regulation (MiCA), which is now fully in effect across the bloc.
Stablecoin-specific rules for asset-referenced and e-money tokens took effect on June 30, 2024, followed by broader provisions for crypto-assets and service providers on Dec. 30, 2024. Like the U.S. approach, MiCA does not cap holdings, instead focusing on reserves, governance and oversight by national regulators.
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What’s Next for Bitcoin and Ether as Downside Fears Ease Ahead of Fed Rate Cut?

Fears of a downside for bitcoin (BTC) and ether (ETH) have eased substantially, according to the latest options market data. However, the pace of the next upward move in these cryptocurrencies will largely hinge on the magnitude of the anticipated Fed rate cut scheduled for Sept. 17.
BTC’s seven-day call/put skew, which measures how implied volatility is distributed across calls versus puts expiring in a week, has recovered to nearly zero from the bearish 4% a week ago, according to data source Amberdata.
The 30- and 60-day option skews, though still slightly negative, have rebounded from last week’s lows, signaling a notable easing of downside fears. Ether’s options skew is exhibiting a similar pattern at the time of writing.
The skew shows the market’s directional bias, or the extent to which traders are more concerned about prices rising or falling. A positive skew suggests a bias towards calls or bullish option plays, while a negative reading indicates relatively higher demand for put options or downside protection.
The reset in options comes as bitcoin and ether prices see a renewed upswing in the lead-up to Wednesday’s Fed rate decision, where the central bank is widely expected to cut rates and lay the groundwork for additional easing over the coming months. BTC has gained over 4% to over $116,000 in seven days, with ether rising nearly 8% to $4,650, according to CoinDesk data.
What happens next largely depends on the size of the impending Fed rate cut. According to CME’s Fed funds futures, traders have priced in over 90% probability that the central bank will cut rates by 25 basis points (bps) to 4%-4.25%. But there is also a slight possibility of a jumbo 50 bps move.
BTC could go berserk in case the Fed delivers the surprise 50 bps move.
«A surprise 50 bps rate cut would be a massive +gamma BUY signal for ETH, SOL and BTC,» Greg Magadini, director of derivatives at Amberdata, said in an email. «Gold will go absolutely nuts as well.»
Note that the Deribit-listed SOL options already exhibit a strong bullish sentiment, with calls trading at 4-5 volatility premium to puts.
Magadini explained that if the decision comes in line with expectations for a 25 bps cut, then a continued calm «grind higher» for BTC looks likely. ETH, meanwhile, may take another week or so to retest all-time highs and convincingly trade above $5,000, he added.
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Asia Morning Briefing: Native Markets Wins Right to Issue USDH After Validator Vote

Good Morning, Asia. Here’s what’s making news in the markets:
Welcome to Asia Morning Briefing, a daily summary of top stories during U.S. hours and an overview of market moves and analysis. For a detailed overview of U.S. markets, see CoinDesk’s Crypto Daybook Americas.
Hyperliquid’s validator community has chosen Native Markets to issue USDH, ending a weeklong contest that drew proposals from Paxos, Frax, Sky (ex-MakerDAO), Agora, and others.
Native Markets, co-founded by former Uniswap Labs president MC Lader, researcher Anish Agnihotri, and early Hyperliquid backer Max Fiege, said it will begin rolling out USDH “within days,” according to a post by Fiege on X.
According to onchain trackers, Native Markets’ proposal took approximately 70% of validators’ votes, while Paxos took 20%, and Ethena came in at 3.2%.
The staged launch starts with capped mints and redemptions, followed by a USDH/USDC spot pair before caps are lifted.
USDH is designed to challenge Circle’s USDC, which currently dominates Hyperliquid with nearly $6 billion in deposits, or about 7.5% of its supply. USDC and other stablecoins will remain supported if they meet liquidity and HYPE staking requirements.
Most rival bidders had promised to channel stablecoin yields back to the ecosystem with Paxos via HYPE buybacks, Frax through direct user yield, and Sky with a 4.85% savings rate plus a $25 million “Genesis Star” project.
Native Markets’ pitch instead stressed credibility, trading experience, and validator alignment.
Market Movement
BTC: BTC has recently reclaimed the $115,000 level, helped by inflows into ETFs, easing U.S. inflation data, and growing expectations for interest rate cuts. Also, technical momentum is picking up, though resistance sits around $116,000, according to CoinDesk’s market insights bot.
ETH: ETH is trading above $4600. The price is being buoyed by strong ETF inflows.
Gold: Gold continues to trade near record highs as traders eye dollar weakness on expected Fed rate cuts.
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