How to Check a Prediction-Market Influencer’s Profit Claim

A prediction-market influencer’s profit screenshot is a claim, not a trading record. It might show a genuine win, an unsold position, a payout mislabeled as profit—or a fabricated trade. Before copying it, check whether the trade happened, whether the gain was realized, and what costs were omitted.

What the New York City inquiry actually alleges

On August 12, 2026, the New York City Council announced a marketing investigation and sent information requests to Kalshi, Polymarket, Coinbase and Gemini Titan. Its announcement specifically described allegations that Polymarket used or allowed influencers to promote nonexistent trades on lookalike websites, portray wagers as profitable when they would have lost money, and publish undisclosed influencer marketing. The announcement describes allegations to be investigated, not findings of liability against the four companies receiving letters. (Council announcement)

For a reader, the useful distinction is between fabrication and incomplete accounting. A fake interface can invent a trade. A genuine interface can still be presented misleadingly if the video hides entry costs, losses or the difference between an estimated value and cash received.

Recalculate one claimed win

Consider a hypothetical contract: “Will the city’s official weather station record at least one inch of rain on Friday?” Assume its rules specify the station, measurement period and official report, with a $1 payout for a winning Yes contract and $0 for a losing one. That is a common binary event-contract structure; the CFTC explains that profit is the payout minus the initial investment, with fees and taxes potentially affecting returns. (CFTC explainer)

An influencer buys 100 Yes contracts at $0.60, spending $60, plus a $1 entry fee. Later, a video values them at $0.65 each. Assume the live order book instead has a $0.57 bid and $0.65 ask, with enough quantity to sell all 100 at the bid.

• Screen valuation: 100 × $0.65 = $65. The apparent $5 gain is not a completed sale and ignores fees.
• Immediate sale: 100 × $0.57 = $57. Assuming $2 in combined entry and exit fees, net profit is $57 − $60 − $2 = −$5.
• Hold and win: The payout is $100, but profit is $100 − $60 − $1 = $39, assuming no additional settlement charge.
• Hold and lose: The payout is $0, leaving a $61 loss, including the entry fee.

These prices and fees are illustrative, not a platform fee quote; taxes are excluded. The bid–ask spread is $0.08. A displayed value or asking price does not establish what a seller can receive. Check the executable bid, available quantity and actual fees.

The resolution wording matters too: rain elsewhere in the city would not establish a Yes outcome under these assumed rules. On Polymarket, for example, market rules identify resolution sources, end dates and treatment of edge cases. (Polymarket resolution documentation)

Ask for evidence the screenshot leaves out

1. The exact market and completed trade. Look for the market identifier, Yes or No side, quantity, filled price and timestamp. Open the operator’s site independently rather than relying on a promotional link. The CFTC warns about counterfeit trading apps and recommends verifying official apps through the trading website. A familiar logo is not authentication. (CFTC safety guidance)

2. The exit or settlement record. An order submission is not a fill. An open-position valuation is not realized profit. Ask whether the contracts were sold or settled, then calculate proceeds minus purchase cost and applicable fees. A withdrawal alone does not distinguish trading gains from deposited money.

3. The performance denominator. One winning trade cannot establish overall profitability. Ask what period the claim covers and whether it includes losing trades, open positions and fees. For a percentage return, identify the capital used as the denominator. Missing records make the result unverified; they do not by themselves prove fraud.

4. The promotional relationship. Look for sponsorship or referral compensation. U.S. FTC guidance says material brand connections should be obvious; video disclosures belong in the video, not merely its description. Disclosure helps you assess incentives—it does not validate the profit calculation. (FTC influencer guidance)

Even a verified historical win does not make today’s entry price attractive. Before considering a position, use the pre-trade market-reading checklist to assess the rules, price history, spread and capital at risk. If the claimed profit cannot be reconciled, do not use it as evidence for risking your money.