Review a swap integration before enabling transactions

Before enabling transactions, a team should be able to show how the integration preserves the reviewed trade from form input through settlement. A launch review is a set of evidence-backed decisions, not a declaration that every dependency is safe.

Prove the transaction boundary

Trace a representative request through amount parsing, provider serialization, quote normalization, approval discovery, payload construction and wallet submission. At each boundary, identify where chain, account, asset identities, amount, recipient and execution bounds are checked.

For every supported execution mode, record the spender and destination discovery policy. A normal transaction, a Permit2 flow and a signed intent should not share one undifferentiated “swap ready” flag.

Use the selected provider's current schema as the reference. For example, the 0x contract documentation distinguishes token permission from execution. The review should show that the implementation preserves that distinction rather than merely linking the documentation.

Demonstrate the important failures

Collect fixture results for account and chain changes, unavailable liquidity, insufficient permission, incomplete simulation, wallet rejection and a broadcast timeout. Each result should show the next application action and whether a wallet request can occur.

For intents, include lost acknowledgements, cancellation races, duplicate fill observations and partial fill followed by a terminal status where supported. For transactions, include receipt failure and replacement handling.

State what was actually tested. A parser fixture, a historical fork and a live end-to-end execution provide different evidence. Do not use one label for all three.

Check recovery and operations

• Reload during a pending attempt and confirm that observation resumes from stored references.
• Pause new execution while leaving pending history visible.
• Verify that API credentials stay outside public bundles and that diagnostic logs exclude secrets and reusable authorization material.
• Inspect provider and RPC failures separately so an incident can be localized.
• Confirm that dependency and configuration versions are attached to relevant attempt records.

The wallet provider standard supplies distinct account, chain and connection signals. The application should have an explicit response to each rather than one reset handler that loses evidence.

Define launch scope honestly

List supported chains, asset behaviors, account types and execution modes. Unsupported combinations should fail before signing with an understandable explanation. A narrow, verified launch scope is easier to operate than a broad list whose edge cases silently fall through.

Assign an owner to unresolved limitations and specify which ones block execution. Keep the review record with the release so later schema or deployment changes can be compared with the assumptions that were approved. This creates a practical basis for maintenance without implying that the checklist guarantees future market conditions or contract behavior.