Josh

VP, Engineering Defi @polymarket • prev SVP, Engineering at @aave (5 years) •

[daniel zaynullin @supermegadaniel]

Polymarket affiliates now earn Revenue share on Predictions.

20%+ of the fees your referrals pay on Predictions and Perps. No cap per referral.

Biggest upgrade our affiliate program has ever had. Everyone now can earn from the biggest prediction market without limits.

My calculations show increase of average affiliate income from 2 to 7x, some even 10x.

No better time to join us.

[Zer0dot @Zer0dots]

So I've been working solo on this harness for exactly 8 months and have been keeping quiet for a long time.

Anyway, I hate hierarchies, here's a screenshot:

[KuCoin @kucoincom]

Trade what happens next with KuCoin Predictions Now.

From headlines to market-moving events, put your views into action.

Skip the Web3 friction. Access polymarkets directly in KuCoin CEX and trade with your KuCoin USDT balance.

KuCoin Predictions is exclusively available on KuCoin App. Update your app to version 5.0.0 or later or download the App Now.

Learn more ->
https://t.co/kOC4X7Ajr0

[Josh @devjoshstevens]

@jmdev4 @SheikhSilicon @Polymarket @louispolymarket @PolymarketTrade @fun Yes flagging

[Josh @devjoshstevens]

@edkeonl @Polymarket So exited to work together 🙏🙏

[Josh @devjoshstevens]

bigup @arthur_braud and @engravr2 for this one

[Josh @devjoshstevens]

Esports markets on Polymarket are now 5.5x faster. Esports volume has been growing like crazy, and traders deserve the fastest experience we can build

[Josh @devjoshstevens]

@RookeBrollins @Polymarket We are reverting to the old rules and refunding anyone who lost money - it was unacceptable to change rules without notice, and it slipped through the cracks. We are going to create a proper playbook and workflow to make sure this doesn't happen again.

[Josh @devjoshstevens]

@shaykevin @Polymarket 🔥🔥

[Kevin Shay @shaykevin]

6mo ago I went on a sidequest to build the US Midterms dashboard for @Polymarket.

A big reason I joined the company was because the predictive clarity that our data provided which serves as a public good amidst all this media chaos.

To highlight the dashboard, here's a launch video. It's my first time making these, lots to learn.

Huge s/o to @Neesh774 for being a close collaborator on this. First of many.

[Josh @devjoshstevens]

We rebuilt the protocol from scratch, with new smart contracts designed for the next generation of prediction markets. Full write-up below 👇

[Rajath Alex @0xrajath]

Introducing Polymarket Protocol V2 https://t.co/FDzaZyiPnl

[Josh @devjoshstevens]

@mini_boss_io @Autonomous_Chad @TheGreekTrader @0xd1namit @Baheet_ Here was the update 👇

[Josh @devjoshstevens]

We usually don't share timelines, but we want to be as transparent as possible about the new Rust CLOB build-out for Polymarket DeFi. The current CLOB is the system behind most of the issues we see today, so we've got all hands on deck building the new one.

- Oct - full order lifecycle working end to end in staging: trading + settlement flow + onchain + indexer + engine notification flow
- Nov - mirroring full production traffic to the new exchange cluster and diffing outputs against the current system. MM test access opens in Nov; we'll confirm the exact date by the end of Oct.
- Nov - migration cutover plan locked, with 2x full rehearsals before we flip anything

If all goes well, we then release it.

The migration is designed to require minimal to no work on any MM/developer's side. Request and response interfaces should stay as they are: we may add extra useful fields, one field may be deprecated, and anything we deprecate will have a notice period before go-live.

[Josh @devjoshstevens]

@gcontarini136 @0xargonstark This is not the case anymore anyone can call the data API v2

[Josh @devjoshstevens]

We made placing orders much faster on the Polymarket UI.

[Josh @devjoshstevens]

@0xargonstark @gcontarini136 Yes, it will have the same request and response API - we won’t be making breaking changes to that.

[Josh @devjoshstevens]

@gcontarini136 👇

[Josh @devjoshstevens]

We usually don't share timelines, but we want to be as transparent as possible about the new Rust CLOB build-out for Polymarket DeFi. The current CLOB is the system behind most of the issues we see today, so we've got all hands on deck building the new one.

- Oct - full order lifecycle working end to end in staging: trading + settlement flow + onchain + indexer + engine notification flow
- Nov - mirroring full production traffic to the new exchange cluster and diffing outputs against the current system. MM test access opens in Nov; we'll confirm the exact date by the end of Oct.
- Nov - migration cutover plan locked, with 2x full rehearsals before we flip anything

If all goes well, we then release it.

The migration is designed to require minimal to no work on any MM/developer's side. Request and response interfaces should stay as they are: we may add extra useful fields, one field may be deprecated, and anything we deprecate will have a notice period before go-live.

[Xtine Fang @XtineFang]

Polymarket Events during Token2049 🇸🇬

Oct 7, Wed
• @Polymarket Singapore Kick-Off
https://t.co/OH6O1IwqtV

Oct 8, Thurs
• Liquid Fund Dinner @Poly_Perps
https://t.co/tHItVxxTea

🇸🇬 F1 Week 🏎️🏎️🏎️

Oct 9, Fri | host: @supermegadaniel
• F1 Paddock Club

Oct 10, Sat | host: @XtineFang
• F1 Paddock Club

Oct 11, Sun (Race Day) | host: @bbrizzzzzz
• F1 Paddock Club

I will be in SG from Oct 4 - 11, please DM or comment below if you want to meet!

[Coinbase Wallet @CoinbaseWallet]

Let your conviction do the talking.

Prediction markets have arrived in Coinbase Wallet.

Powered by @Polymarket

[Josh @devjoshstevens]

@0xRBUZ Carryover: We will rehydrate all open orders as normal when the new exchange binary goes live.

[Josh @devjoshstevens]

We usually don't share timelines, but we want to be as transparent as possible about the new Rust CLOB build-out for Polymarket DeFi. The current CLOB is the system behind most of the issues we see today, so we've got all hands on deck building the new one.

- Oct - full order lifecycle working end to end in staging: trading + settlement flow + onchain + indexer + engine notification flow
- Nov - mirroring full production traffic to the new exchange cluster and diffing outputs against the current system. MM test access opens in Nov; we'll confirm the exact date by the end of Oct.
- Nov - migration cutover plan locked, with 2x full rehearsals before we flip anything

If all goes well, we then release it.

The migration is designed to require minimal to no work on any MM/developer's side. Request and response interfaces should stay as they are: we may add extra useful fields, one field may be deprecated, and anything we deprecate will have a notice period before go-live.

[Josh @devjoshstevens]

Honest post: the Polymarket DeFi CLOB is full of tech debt. It grew fast, got hacked together, and most of the team inherited it that way. Since joining and building out the team, we have scaled it 10x and made it 3x faster, but it’s not enough; the core foundations of how it’s been built are wrong in almost every way. You try to fix one thing, and another thing goes wrong; the conclusion now is that the codebase can’t be saved long-term.

The exchange is the heart of Polymarket; everything runs through it. If we want to be the best exchange in the world, it must be fast, stable, and scalable. We can’t keep patching the old one, where these core foundations are generally missing throughout, so we’re rewriting it from scratch in Rust.

Early numbers: 10-20x faster on p99 than today, 200,000 orders per second (15x what we have now, with room to reach 400,000+), and stability under load. This will put us faster than most exchanges, including CEXs.

Building it in Rust gives us memory safety with no garbage collector. No GC means no random pauses and no random latency spikes; the tail latency in the benchmarks is the tail latency you get in production, alongside a strict compiler that enforces correctness up front. Data races and memory corruption (the bugs that take exchanges down) can’t exist in the first place.

Polymarket has to take it seriously that we are an exchange; this is people’s money, not a joke. To succeed, we have to fix this; otherwise, we will fail. It’s as simple as that. I joined to build the best software in the world, not to maintain some of the worst, and I will do everything I can to make Polymarket a serious exchange.

We are aiming to have the exchange ready sometime in Q4 (mid to end). I'll communicate progress as we go so you all know the status. Breaking changes will be minimal for all integrators and will be communicated in advance. We will maintain the existing CLOB and keep trying to improve it as we build this side by side. We can’t wait to throw away the existing CLOB; we dislike it as much as you all do.

Make Polymarket fast, finally.