KW Worldwide Listings Search API
The only Keller Williams API whose specification is published anonymously in the DevHub API catalog. The KW Worldwide Listings service returns Keller Williams Listing Service (KWLS) listings scoped to a KW Worldwide region, and supports listing create, update and delete plus a lookup table of controlled vocabularies (property types, statuses, flooring, roof type, appliances, currency, country, state/province and more) and an organization-people lookup. The published OpenAPI 3.0.1 document declares 5 paths and 8 operations against a production and a sandbox server. The spec's own description states the service is not a substitution for, or tied to, any Multiple Listing Service database records. Access requires an approved DevHub application; requests carry an API key plus a Basic or Bearer credential.