“I have read the API Terms of Service” is the biggest lie of the programmable web. To increase trust, openness and safety in digital Infrastructure, we evaluated the opportunity to adopt a new framework to make API Terms of Service (ToS) easily understandable and shareable with users. By conducting interviews, surveys and focus group with API users, providers and other stakeholders, by using a legal design approach and prototype testing, we have developed a model collaboratively to define a way forward for more standardized, accessible approaches to documenting and enforcing API Terms of Service. Our research has clarified the frictions in the user experience of API, the power imbalance and inequalities between API producers and consumers explored the diversity of situations and people involved in the API ecosystem. Moreover, this research designed a framework for healthier API ecosystems called FACT (FAIR API Commitment to Trust) related to a FACT license describing the mutual commitments between API Providers and Users. Particular attention has been dedicated to the creation of resources that are easily readable and understandable for a wide audience, thus contributing to the establishment of a trustworthy and sustainable framework that can be easily implemented for the essential digital infrastructures that APIs represent