There should be only one API design guideline. <a href="http:&#x2F;&#x2F;www.vinaysahni.com&#x2F;best-practices-for-a-pragmatic-restful-api" rel="nofollow">http:&#x2F;&#x2F;www.vinaysahni.com&#x2F;best-practices-for-a-pragmatic-res...</a>.