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Erroneous trade and fat-finger review policies

Anyone who has traded in a hurry knows the moment of entering the wrong price. On a thin event contract book, a single mistaken order can sweep several price levels in a second. Venues have rules for what happens next, but those rules are narrower than many people assume. This SoftCta guide explains how erroneous trade policies typically work, how price bands reduce errors, and why the safest assumption is that a filled trade is final.

What error trade policies cover

Regulated exchanges commonly publish error trade policies in their rulebooks. These describe when the exchange may cancel or adjust a trade that was executed at a price clearly away from fair value. Common elements include a no-bust range around a reference price, a deadline for requesting review, and discretion for the exchange. A trade inside the no-bust range usually stands even if it was a mistake.

Price bands as prevention

Many venues reject orders priced too far from recent trades or limit how far a price can move in one step. Our price bands guide explains these controls. They exist partly so that fewer errors need reviewing afterward.

Adjust versus bust

If a trade is reviewed, the venue might cancel it entirely (bust) or adjust the price to a fair reference. Both sides of the trade are affected. The other party may have hedged or traded further based on the fill, which is one reason exchanges keep these reviews narrow.

Halts and pauses

A sudden run of erroneous fills may lead a venue to pause trading in a market. Our halt and suspension guide covers what that means for open orders. A pause does not mean trades will be reversed.

On-chain finality

Venues that settle on a blockchain generally cannot reverse a confirmed transaction. Policies on off-chain order matching may allow some intervention before settlement, but readers should not rely on it. Our refund and undo guide covers related situations.

Prevention habits

Use limit orders rather than market orders on thin books, check the side (Yes or No) and the price format before submitting, start with small sizes when using a new interface, and turn on any confirmation dialogs the venue offers. Our slippage guide explains how a market order can walk a thin book, and the fee drag tool shows how costs add up even on correct trades.

If it happens

Contact the venue promptly through its official support channel, describe the trade with timestamps, and read the error policy. Beware of anyone who contacts you offering to recover funds for a fee.

Primary sources SoftCta readers open

• Exchange rulebooks and error trade policy sections.
• CFTC guidance on designated contract market rules.
• Venue help centre pages on order confirmation settings.

Reading the quote step by step

• Read the full title and rules, including the named settlement source and the time zone.
• Convert the Yes and No prices to implied probabilities and note the gap between them.
• Subtract fees and spread to see the effective price you would actually face.
• Write your own probability range and the evidence behind it, then compare.
• Check related and near-duplicate markets on other venues for consistency.

Closing SoftCta checklist

• Re-read the venue definition in your own words before reacting to a price.
• Convert prices with fee and spread awareness; verify live cents on the operator.
• Prefer primary settlement sources over secondary headlines and social summaries.
• Treat ChanceWire hubs, movers, and tools as orientation — not order entry.
• Confirm age, location, and product eligibility; SoftCta pages will not suggest location spoofing.
• If clarity is incomplete, watching is a complete SoftCta outcome — no pick-selling urgency required.

SoftCta habits

• Write your own probability range before checking the crowd price.
• Prefer dated primary sources over social summaries.
• Compare related markets when a single book looks extreme.
• Size curiosity with fees and depth in mind; substantial risk of loss.