Team · Founder & Editor-in-Chief

Eli Marsh

Founder, editor-in-chief, and the byline on most of what you read here. Ten years bridging trading floors and on-chain markets.

Last reviewed · Poly Syncer editorial team

Background

Eli Marsh grew up in Evanston, Illinois and studied mathematics at the University of Chicago, graduating with a BSc in 2014. He took a summer internship at a Chicago options market-maker the year before he graduated and never left the industry. From 2014 through 2020 he was a quantitative trader at a mid-sized Chicago proprietary trading firm, where he started on the equity options desk and moved to the futures and FX volatility book in 2017. Most of his work involved short-dated convex products: VIX options, treasury futures gamma, and a small but profitable corner of the FX options market that traded around scheduled central-bank events.

In 2020 he left the prop floor to join an on-chain analytics startup as a senior research analyst. The company built dashboards for institutional clients trying to make sense of decentralized exchange flow, and Eli wrote the research notes that went out alongside the data. The startup did not survive the 2022 cycle, but the time spent staring at on-chain order flow changed how he thought about market structure. When the team wound down he kept writing, on Substack at first, and from early 2023 he covered Polymarket full-time as a contracted research analyst for two prediction-market focused funds.

The thesis that became Poly Syncer was clear by mid-2025. Top wallets on Polymarket consistently outperformed the median, the gap was wider than on any centralized venue, and the infrastructure to act on that gap simply did not exist. Eli started Poly Syncer in November 2025 with Maria Ostrowski and Jamal Okafor, both of whom he had known professionally for years.

What he works on at Poly Syncer

Eli owns three things at Poly Syncer: editorial, partnerships, and the public face of the company. Editorial is the most visible. He is the byline on most posts on the blog, including the recurring Top Wallets data series, the methodology explainers, and the wallet evaluation guides that frame Poly Syncer as a smart money tracker for Polymarket. He sets the editorial calendar, commissions and edits guest pieces from the rest of the team, and personally signs off on anything that touches research methodology or risk disclosure.

Partnerships covers everything from Polymarket integrations to RPC providers to the Trail of Bits audit relationship. When Poly Syncer added the new Polygon CDK rollup as a settlement target in Q1 2026, Eli ran the negotiation. When the company switched its primary RPC vendor in March, he ran the procurement and the migration timeline together with Jamal.

The public face piece is the part that consumes the most calendar time. Eli is the person who shows up on prediction-market podcasts, writes the long-form pieces, and answers press inquiries. He drafted the manifesto and the whitepaper, the latter in close collaboration with Maria and Jamal. He is also the person who signs the post-mortems on the changelog when something breaks — a deliberate choice, because trust in a non-custodial system is personal.

Perspective

Eli has written extensively about why he thinks prediction markets are the most interesting asset class of the next decade. The condensed version of his thesis:

“Every other major asset class has a price-discovery mechanism that is at least partly fictional. Equities trade on multiples of cash flows that haven’t happened yet. Bonds trade on a yield curve that depends on what a central bank will or won’t do. Crypto trades on narrative. Prediction markets are the only asset class I’ve ever traded where the terminal payoff is, by design, observable. The contract pays one dollar or zero dollars on a date you know in advance, on a question with a definite answer. Everything else — the entire edifice of price discovery — is just people arguing about probability. That is an unusually clean substrate for a market.”

The corollary, which is the part that motivates Poly Syncer specifically, is that the wallets that do well on Polymarket are doing well at something measurable. They are not lucky in the way a long-only equities trader can be lucky over a five-year stretch. They are calibrated forecasters, and calibration shows up in their P&L distribution, their hit rate, and the way they size positions. Once you accept that, the question becomes whether their trades are copy-able faster than humans can copy them by hand. The answer turned out to be yes, but only with infrastructure most retail users will never build. Poly Syncer exists to provide that infrastructure.

Eli is also vocal about the things he thinks prediction markets are not good at. He has written about the limits of long-tail markets where liquidity is thin and the price is dominated by two or three counterparties, and he has been openly skeptical of efforts to push prediction markets into domains where the resolution criteria are subjective. The categories breakdown is the most direct expression of that view.

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