Josh

Excited to join @Polymarket as VP of Engineering. I haven’t seen a hungrier team in my career, the talent density here is insane. We’re building the future of how people understand the world. What should we build next? What’s broken? What’s missing? Drop it below. P.s we are hiring world class people in NYC DMs open

@ikarusz26 👇

Ghost fills are fixed with deposit wallet.. the new issues is due to some edge case in cancellation races causing some failing trades (it’s not the same) - fix for that goes out today. We also do use the private mempool for some tx types but that wouldnt fix for the ghost order issue.

Why are ghost orders still a thing on Polymarket? Surely banning accounts isn't the fix here. Polygon already has private mempool services, which should be more than enough for now. And when they launch their L2, they can implement a private sequencer. What am I missing?

@Autonomous_Chad This is now fully fixed the last part of the fix went out early EST this morning and looks clear.

This is due to a bad state not staying in sync with the chain all the time, causing a trade not to be taken down when it would revert. The percentage of affected trades is small, but it's more prominent in markets with lower liquidity, like weather. We are working on a fix for this now. This fix will also fix the reward issue, as it’s related to it.

Ghost fills are back ! exploiters found a new way to cancel their orders after they got filled. They are printing over 6 figs/day across a range of new wallets. It's yet unknown how the exploit work but the signs are there : - total absence of adverse fill - impossible rewards/fills ratio - multiple reports traders having their ordered cancelled post fills - multiple new accounts printing $5k every day then being cycled through Right now it's affecting mostly weather markets, because that's where adverse fills are most prominent, but the exploit is probably general Ghost fills had been fixed by the deposit wallet update a few months ago, but it seems attackers found a new way @mustafap0ly @williamlegate look this up

@kopiXBT @Polymarket Dm you

I've been an avid @Polymarket user for the past year now but the lack of support the team has given me on UNAUTHORISED withdrawals is insane to me as this should be A HUGE ISSUE to see what is going on. My @Polymarket account has had unauthorised withdrawals thrice in the past 3 weeks and support has not provided any valuable help of sorts and just said too bad we can't do anything. Is this how @Polymarket decides to be? Clearly somehow my magic link account is compromised only for withdrawals and yet there is no help supported or investigated as to how attackers are doing this. I have provided all 3 transaction hash to support and just being ignored, with the hashes showing withdrawals to the same Polymarket account that is not initiated by me. A total of USD500 was drained from my account and every time I deposit any USD in, it gets drained in matter of hours. At this point I am not even trying to get a refund for my USD, but to see that @Polymarket doesn't even care to investigate how these unauthorised withdrawals are being done is mindboggling to me. @mustafap0ly @williamlegate @devjoshstevens @Polymarket @PolymarketTrade @shayne_coplan

Combos are now officially LIVE on Polymarket​.com Stack your picks across all sports: World Cup, UFC, MLB, & more…

@sem101031 @Polymarket @PolymarketTrade @mustafap0ly @gites4490 @santiroy_28 @Airdrop_Sheriff @ImChoudharyA @Missionbe1 @PolymarketSport Good luck

Built my combos around Norway tonight. 🇳🇴 Haaland only needs a few moments to change a game. If he turns up, this could be a fun night on @Polymarket . Let's ride. ⚽🔥

@tomdnc Most likely we will integrate it in the 15 min markets first while we do more research on it for the 5 minute markets.

Polymarket staff confirms that the resolution criteria for the crypto markets are about to drastically change. TWAP (Time weighted average price) will be integrated to the 5 minute markets, probably based on the final minute, to determine it's outcome.

Yesterday we sent over $4m to ~30k users to backfill taker rebates and level up bonuses. The majority of our fees go back to our users via: 1. Taker rebates + level up bonuses 2. Maker rebates 3. Liquidity rewards 4. Referral rewards 5. Affiliate program 6. Builder rewards 7. Yield on select markets

More invites here to use perps now polymarket.com/perps?c=01fa1q…

@vonzz6 💪

今天早上polymarket上你们有没有收到一笔充值，应该是补发吃单返佣的，我已经收到400多U！ 咨询了群友也说收到了，具体数量应该根据你的手续费然后返佣等级来算的，大家可以都去看看有没有收到！

@heyvaro Reaching out

today i opened a btc position at 62k, but because of an issue with your order book it was filled at 64k. this is something that needs to be fixed. issues like this should not happen on a quality perpetuals dex. i contacted support, but they didnt offer any solution. they just told me it was my problem. its disappointing. ive been trading there every day, but after this ill most likely stop. i wasnt expecting a response like this with no resolution. before opening your platform to everyone, you should fix the issues your dex still has. @devjoshstevens

Start trading perps on Polymarket now polymarket.com/perps?c=01fa1q…

@ProMint_X x.com/devjoshstevens…

New critical Polymarket exploit Total damage stands at $31K Polymarket has dealt with this issue before, but this time it’s even worse, and the team is doing absolutely nothing about it. What sets this apart from the previous ghost fill exploit is that orders are being canceled before they even hit the CLOB system. This is a direct vulnerability in Polymarket’s engine. It all stems from a fundamentally flawed LP rewards formula. Polymarket often sets the volume weight (wvolume​) to 0 and the order book weight (worder book​) to 1 for new or niche markets (like weather markets). The platform does this intentionally to bootstrap baseline liquidity for empty markets with no trading activity. When they do this, the fvolume​ component is completely dropped from the equation. And that’s exactly what exploiters are capitalizing on. When the order book weight is maxed out, bots rack up massive scores for forder book​ simply by keeping thick orders tight to the spread. But the moment someone tries to fill them (generating real fvolume​ and taking their cash), they cancel the transaction. Because of the zero volume weight, they don't care about actual fills - they are farming the formula solely by holding orders in the book, completely eliminating any risk of adverse fill.

@cryptobasenji @Autonomous_Chad It can happen in all markets yes - it's just more prominent in markets with lower liquidity

@devjoshstevens @Autonomous_Chad “Markets with lower liquidity” FALSE. I got ghost filled in the England DR Congo match market

@polymarketfdn @vonzz6 @williamlegate @mustafap0ly We have/are banning the abusers but they spin up new ones programmatically and do it again. We keep banning as we work on a fix to limit the people hurt by it.

@vonzz6 @devjoshstevens @williamlegate @mustafap0ly Just ban them. It’s the simplest and fastest solution. Even if you can’t catch them all, keep banning them and exclude those accounts from any future rewards.

@liying49041494 @Autonomous_Chad Any market with low liquidity at mid price is prone to this. Working on a fix asap

@devjoshstevens @Autonomous_Chad They’ve dominated every market, not just the weather, as you can see in this video.

@0xMarchyel 👇

Serious issue right now. Ghost fills are currently destroying the "fun" and steal the liquidity rewards. We need a fix and bans asap for this abusers!

@protrade47 @PolymarketTrade @Polymarket 👇

Someone found a way to fake fills and is printing 6 figures a day in LP rewards on Polymarket

@Marczeller @Cbb0fe 👀👀🔥

Another good day for France.