What an event contract is
An event contract pays out on whether a stated real-world event happens. The underlying is not an asset price but a fact: an inflation print, an election result, a weather threshold. It settles at $1.00 or $0.00 against the stated criteria.
The term carries legal weight in the United States. Event contracts trade on CFTC-designated contract markets, which makes them regulated derivatives rather than gambling products, and that classification decides who may offer them and to whom.
Regulated venue versus on-chain market
A regulated exchange lists event contracts with a defined settlement process and named contract criteria. Polymarket's global market runs on-chain with resolution through an optimistic oracle, where a proposed outcome can be disputed and escalated.
The practical differences follow from that: how disputes are handled, who can access the venue, what happens to a position when the wording of a question turns out to be ambiguous, and where the counterparty risk sits.
Where 0xinsider uses event contracts
0xinsider covers Polymarket, where every trade clears on-chain and carries a wallet address. That is what lets it grade the trader behind a position; a regulated exchange keeps trader identity private, so the same question cannot be asked of its order flow. The comparison page covers how an event contract differs from a sportsbook wager on pricing, house edge, and regulation.
