Onchain data weakens insider-trading claim in NYT election betting report

what happened

The New York Times reported on Friday that researchers at Vanderbilt University had flagged big, profitable wagers on Polymarket and Kalshi placed ahead of certain polls in the Nebraska and Michigan Senate contests. The timing raised the question of whether the bettor had early access to poll results.

The Block says its own analysis of onchain records and trading data points elsewhere. It found the trader has a long record of large, risky positions and complex DeFi yield farming, which the Times did not mention. Matching deposits to Kalshi trades also suggests two large bets may have been placed ten minutes after one poll was published. Two experts who reviewed the findings said foul play cannot be ruled out, but other explanations, such as a wealthy crypto investor with a habit of making large directional wagers, fit the evidence better.

The Times itself acknowledged it was unclear whether the trader had inside information, and Polymarket said it is running its own investigation. Economist Rajiv Sethi of Barnard College said the activity looked more like wagers on the final result than an effort to profit from the poll releases.

why it matters

For prediction-market users and the platforms themselves, the case is a reminder of how hard it is to separate insider trading from an ordinary large bet. The Block's findings weaken the poll-access theory, but there is no conclusive answer yet, and Polymarket's probe could shape trust in these platforms.

market impact

Prediction markets on Polymarket and Kalshi: scrutiny of insider trading may weigh on trust in these platforms.

tags

instruments

on polymarket