Who resolves markets on VPX?

VPX staff resolve public markets once they close, according to the resolution criteria in the market description. Private markets are resolved by their owner or admins.

Can VPX trade against its users?

No. VPX runs an order book: every trade is between two users, matched by price and then by time. VPX does not take the other side of your orders.

How does VPX handle insider trading?

VPX monitors for suspicious trading and can void trades, suspend accounts, or delay resolution when integrity concerns arise. Report concerns to integrity@vancouverpx.ca.

Is there real money at stake?

No. All trading on VPX uses play money, which cannot be bought with or cashed out for real currency.

Market Integrity & Insider Trading

Market integrity is essential for a fair prediction exchange. This page explains how markets are resolved, how orders are matched, and how VPX handles trading by informed participants.

How Markets Are Resolved

Every market states its resolution criteria in its description. A public market must close before it can be resolved, and VPX staff then resolve it against those criteria, recording a note with the outcome. Private markets are resolved by their owner or admins, who can also halt trading and void individual trades in their market.

If you think a market was resolved incorrectly, email integrity@vancouverpx.ca with the market link and your reasoning.

How Orders Are Matched

VPX is a limit order book, not a house that sets odds. Orders match by price first, then by time: at the same price, the order placed earliest fills first. A YES buy and a NO buy whose prices add up to 100¢ or more are matched into a new pair of shares. VPX never takes the other side of a trade. See The Order Book and Marriage & Divorce for the details.

What Is Toxic Order Flow?

Toxic order flow refers to trades from participants who have better information than the rest of the market. These traders consistently profit at the expense of less-informed participants, which can discourage regular traders from participating.

Insiders who know an outcome before it's public
Participants who can influence the outcome being predicted
Traders with access to non-public data sources

Information Asymmetry

Some level of information asymmetry is natural and even desirable — it's what makes prices accurate. A trader who does better research should be rewarded. The problem arises when the asymmetry comes from privileged access rather than effort.

The paradox: Prediction markets need informed traders to set accurate prices, but too much informed trading drives away the liquidity providers who make the market function.

VPX Policies

VPX takes market integrity seriously. While we cannot prevent all informed trading, we monitor for suspicious patterns and reserve the right to:

Void trades that appear to be based on insider information
Suspend accounts engaged in market manipulation
Delay resolution if integrity concerns arise
Adjust market rules to prevent exploitation

Reporting Concerns

If you suspect insider trading or market manipulation, please contact us at integrity@vancouverpx.ca. All reports are reviewed confidentially.