Answer
Good starting candidates share a few traits: they touch one clear transaction, such as an order status check, an inventory lookup, or a customer account balance, they have an obvious external consumer such as a mobile app, e-commerce platform, or partner system, and they do not require write access to core files on day one. Read-only APIs are lower risk to launch and still deliver real business value, which makes them a natural first phase before the team tackles anything that updates production data.
The most common way this kind of pilot goes wrong is scope creep, where a bounded lookup API quietly grows into a general-purpose integration layer without anyone revisiting security, versioning, or ownership. Buyers should insist on a defined boundary for the pilot, a named owner responsible for the endpoint after launch, and a specific measure of success, such as reduced manual order status calls or faster partner onboarding, agreed before the project starts. That discipline is what turns a good first API into a template for the next ten rather than a one-off that has to be reworked later.