API Evangelist
Studying the technology, business, and politics of APIs since 2010.
About API Evangelist
API Evangelist has worked for the last 15 years to make sense of the technology, business, and politics of APIs, profiling public and private APIs and distilling down knowledge into a regular cadence of API storytelling, and weekly knowledge building sessions focused on schema, APIs, governance, operations, change, and evangelism.
Latest Stories
Browse All
The Kin Score, Facet By Facet: Contract Quality
This is part two of nine, one facet of the Kin Score each business day. Yesterday I covered Discoverability, which asks whether your API can be found. Today is Contract Quality,...
Eon Has Two Undocumented Dialects In One Document
Yesterday I showed you Demodesk’s x-mcp, an object with enabled, toolName and title. Here is Eon’s, from the same key, in the same position on an operation: x-mcp: true x-inter...
You Cannot See Your Own API From The Outside
I have spent a lot of my career sitting with teams who are proud of their API, and who have no idea what it looks like from the outside. This is the single most consistent thing...
The Kin Score, Facet By Facet: Discoverability
Yesterday I published Kin Score 0.23, the London release, and most scores in the catalog moved. Over the next nine business days I am going to walk through the Kin Score one fac...
Fastify Now Speaks OpenAPI 3.2
The OpenAPI Initiative announced OpenAPI 3.2 on September 23rd, 2025. Almost exactly a year later, on September 22nd, the Fastify project shipped fastify-swagger v9.9.0, and its...
Understanding Our Relationship With Technology
API Evangelist has been working to understand our relationship with Internet technology for the last fifteen years, but it has primarily been focused on understanding the producers of the technology, where moving forward I am more interested in understanding the consumers of not just APIs, but the applications they build on top of APIs.
Guidance
Browse AllAbout the API Evangelist Site
This site is the active daily working toolbox for Kin Lane. Feel free to explore the toolbox, you won't break anything. API Evangelist works out in the open to encourage the reuse of our work, while also demonstrating the potential of evangelizing your API work as it occurs.
Newsletters
Two emails, both Monday mornings. Take either, or both.
API Evangelist
Highlights of the stories, conversations, and API knowledge published across the industry each week.
The Specification Layer
What actually merged into the thirty specifications the Linux Foundation stewards — OpenAPI, AsyncAPI, JSON Schema, and the rest.
Discover APIs
Search across thousands of APIs on apis.io →