Polymarket CMO fired: Modabber Out After Fake-Trades Probe

Polymarket CMO fired: the prediction market has reportedly pushed out chief marketing officer Matthew Modabber after an internal probe into several episodes that worried investors, including a webpage built around videos of users profiting from fake trades. The New York Post broke the story on October 22, citing unnamed sources, and CoinDesk and Crypto Briefing followed.

What actually happened

According to the New York Post, as summarized by CoinDesk, Polymarket fired Modabber after an internal investigation into several embarrassing incidents. One source said the company is finalizing a separation agreement. CoinDesk said it had reached out to Polymarket for comment, and as of its report there was no public statement from the company.

The best-known issue dates back to June, when The Wall Street Journal reported that Modabber's team built a webpage showcasing videos of Polymarket users making money on trades that were not real. The Commodity Futures Trading Commission opened an investigation into that page. CoinDesk stresses that the probe is ongoing and that no wrongdoing has been proven. Polymarket told the Journal back then that it was "committed to maintaining accurate, fair, and transparent markets."

Crypto Briefing added more claims, citing research it did not fully identify: more than $2.5 million allegedly routed through Modabber's personal PayPal account, with at least $350,000 reportedly paid to content creators for promotional posts that lacked required disclosures. Those figures have not been confirmed by Polymarket, so treat them as reported allegations, not established facts.

Why the Polymarket CMO fired story matters

This was not a random marketing hire. Crypto Briefing describes Modabber as Polymarket's eleventh employee, a trusted adviser to Coplan, and the head of a marketing team of more than 50 people. He has claimed credit for helping push daily trading volume from about $300,000 to the mid-nine figures.

The Post's account, relayed by CoinDesk, says the decision was messy. An "irate" Coplan reportedly threatened to fire members of the legal team pushing for the termination, according to one source, before accepting that parting ways was best for the company. The board, which includes Coplan, crypto investor Nick Tomaino, lawyer Alex Spiro and an unnamed Founders Fund partner, reportedly concluded in recent weeks that Modabber was hindering efforts to shed a scrappy startup image ahead of a potential IPO.

Prediction markets sell trust in prices. Staged profit videos and undisclosed paid posts hit that trust directly.

That is the real stake for users. Prediction markets live or die on people believing the prices are honest and the marketing is not rigged. A page showing fake winning trades makes winning look easier than it is, and undisclosed sponsored posts blur ads with genuine enthusiasm.

What it does not change

Nothing in these reports says markets on Polymarket were mispriced or that user funds were at risk. The allegations are about marketing practices, not about how contracts resolve. Your open positions do not change because a marketing chief left.

The piece with real regulatory weight is the CFTC probe into the fake-trades page, and that remains open. Until regulators say something, the outcome is unknown. For background on the platform itself, see our Polymarket V2 explainer and our piece on Galaxy's Polymarket retail losses research.

What to do as a reader

First, keep a clear line between confirmed and reported. The Polymarket CMO fired headline rests on anonymous sources in the Post, and the PayPal numbers come from Crypto Briefing's unnamed research. Polymarket itself had not commented publicly in the reports we read.

Second, be skeptical of any marketing that shows easy wins, from any platform. Screenshots of huge payouts tell you nothing about the many traders who lost. Galaxy's research on retail outcomes is a useful reality check.

Third, if you use Polymarket, nothing about this requires action on your positions. Read market rules, check resolution sources, and size bets so a bad call does not hurt. Nothing here is investment advice. Watch for an official statement and for any update on the CFTC probe, since that is what could actually move things.

Sources: CoinDesk report, Crypto Briefing report and the original New York Post exclusive.