Okta is a standards-compliant OAuth 2.0 authorization server and a certified OpenID Provider.

Okta's OAuth 2.0 API provides API security via scoped access tokens, and OpenID Connect provides user authentication and an SSO layer which is lighter and easier to use than SAML.

This site shows how Okta integrates with several leading API gateways. However, any gateway that supports an external OAuth authorization server should work with Okta. Similarly, any gateway that supports jwt validation should work with Okta as well.

Apigee demo docs
AWS API Gateway (lambda authorizer) demo docs
AWS API Gateway (jwt validation) docs
Google Cloud Endpoints docs
Kong (enterprise) docs
Mulesoft Anypoint (OIDC provider) demo docs
Mulesoft Anypoint (jwt validation) docs
Software AG docs
Tyk docs