An order book, automated market maker or pool changes the operating mechanics. It does not by itself determine the legal classification or authorization required for the complete product.
Write the outcome before choosing the engine
An event contract should specify the subject, outcome, authoritative source, relevant time and rules for ambiguity. It also states when trading closes, what makes the market invalid and how a dispute is handled.
Consider a hypothetical contract on a published index value. “Will the index be above 100?” leaves the index provider, observation time, time zone, exact comparison and correction policy unresolved. A complete specification needs those fields and an answer for an unavailable or later-corrected publication. Do not leave the resolver to supply missing rules after positions have been taken.
Version the approved wording and connect it to the listed market. If participants can propose markets, define the review and approval process before listing; accepting a suggestion is different from authorizing trading.
Choose the trading mechanism by its operating consequences
| Mechanism | Core operating requirement | Question to resolve |
|---|---|---|
| Order book | Opposing orders and matching rules | Who supplies depth, and how are partial fills and cancellations handled? |
| Automated market maker | A pricing rule and funded liquidity or inventory arrangement | Who bears exposure and can change or pause the mechanism? |
| Pool | A defined contribution and distribution rule | When is the pool closed and how are proceeds allocated? |
Compare the economics, permissions and participant experience of the proposed configuration. A mechanism suitable for one market does not prove it will support another market with different demand or resolution risk.
Make resolution and challenge handling inspectable
Identify who proposes the result, who can challenge it and who has final authority. Record the source evidence, relevant times, decisions and any adjustment. If a bond or challenge window is part of the design, specify its terms in the contract rather than borrowing parameters from another platform.
Rehearse an unavailable source, conflicting reports, canceled event and challenged outcome. Establish whether trading stops, settlement waits or the market is invalidated under the existing rules. A technical timeout should not silently become a decision about the event's truth.
Plan funds, surveillance and wind-down together
Map participant balances, reserved exposure, fees and settlement to the wallet or custody arrangement. Define access controls for market administrators and the records needed to investigate self-matching, manipulation or other suspicious activity.
A wind-down plan should explain how new trading is stopped, outstanding positions are resolved and funds are returned under the relevant rules. Test a halt with open positions so the plan reflects the platform's actual behavior.
Scope the approval and delivery work
The legal route depends on the operator, contract subjects, participant locations and trading mechanics. A jurisdiction's approval of another business does not establish permission for yours. Use licensing support to define the applicable work alongside the technical scope.
Send a sample contract and proposed trading model. Include the target markets, resolution source, liquidity plan and settlement method.