SOAP follows the RPC API style and exposes procedures as central concepts. It is standardized by the W3C and is the most widely used protocol for web services.

SOAP style APIs and architectures are in widespread use, however, typically only for company-internal use or for services called by trusted partners.


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Matthias Biehl

As API strategist, Matthias helps clients discover their opportunities for innovation with APIs & ecosystems and turn them into actionable digital strategies. Based on his experience in leading large-scale API initiatives in both business and technology roles, he shares best practices and provides both strategic and practical guidance. He has stayed a techie at heart and at some point, got a Ph.D. Matthias publishes a blog at, is the author of several books on APIs, and regularly speaks at technology conferences.