Separate the interface from the market underneath
Before commissioning a decentralized exchange, identify what you are actually building: an interface to existing pools, a routing integration, new pools, or custom protocol contracts. These choices create different delivery and operating responsibilities. A working swap form does not supply liquidity. Ask who establishes supported markets, where initial liquidity comes from, and who handles the integration when a dependency changes. Include those answers in the scope before comparing visual demonstrations. The proposal should distinguish application work from market operations and any independent contract review.
Explain price impact and slippage separately
Price impact concerns how a trade changes its execution price through available liquidity. Slippage concerns a changed price between quotation and execution. Customers need both concepts translated into decisions, rather than hidden behind one warning badge. Show a smaller example trade beside a larger one during product review and discuss the expected message in each case. Avoid treating a permissive tolerance as the routine solution for failed trades. Specify when the interface refreshes a quote and when a meaningful change requires the customer to approve again.
Design liquidity information for the decision at hand
Concentrated liquidity positions cover chosen price ranges, so liquidity provision involves more than entering two balances. If the product includes position management, describe how a customer sees its range and whether it is currently active. For a trading interface, prioritize what the available route means for the proposed order rather than relying on a large total-value figure. Ask the implementation team to demonstrate a quiet market and a thin route. The interface should remain understandable when a popular pair is not economically practical for the requested amount.
Make the quote a reviewable agreement
Present the route, input, expected output, execution limit, estimated network cost, and any application fee together. Clearly label estimates and avoid silently replacing the approved terms while a wallet confirmation is open. Treat token approval as its own permission decision, with an identifiable spender and amount. During acceptance, compare the human-readable review with the transaction being prepared. The goal is traceability: a reviewer should be able to explain how the customer's selected trade became the request sent to their wallet, without reconstructing it from unrelated screens.
Give every failed or interrupted trade a next step
List the cases your team expects to support: an expired quote, insufficient balance, rejected wallet request, unavailable route, provider timeout, or transaction that remains pending. Decide which cases justify a fresh quote and which require checking an existing transaction first. Keep route selection and transaction references available to support. Do not convert every error into an instruction to increase tolerance. A useful error message describes the stage that failed and the action still available, while preserving the customer's entered pair and amount wherever that remains appropriate.
Evaluate the integration with realistic market conditions
Acceptance should include different order sizes, depleted liquidity, delayed responses, unsupported tokens, and a customer changing networks midway through the journey. Define the supported contracts and environments explicitly. Document how dependency updates are assessed and how routes can be suspended when their behavior is uncertain. If a supplier presents speed or pricing comparisons, ask for the workload and measurement conditions. A stronger DEX specification combines a coherent customer journey with explicit liquidity assumptions, observable execution states, and a maintenance plan that survives beyond the initial demonstration.