authlete.com
Authlete
https://www.authlete.com/pricing.html
You can start Free plan for free. And upgrade it later when you want to. Xff5e; 0.1 M. After 0.1 M calls. 1 M ~ 10 M. Per 10,000 calls. After 1 M calls. 10 M ~ 100 M. Per 10,000 calls. After 10 M calls. To upgrade Free plan to Lite plan or to Premium plan, please contact us: support@authlete.com. To use Enterprise plan, please contact us: support@authlete.com. If your service has possibility to expand to the level of Enterprise plan, please consider selecting Enterprise plan from the beginning.
authlete.com
Authlete
https://www.authlete.com/documents.html
Amazon API Gateway Custom Authorizer OAuth. Amazon API Gateway AWS Lambda OAuth. Proof Key for Code Exchange (RFC 7636). Authlete is your OAuth 2.0 server and OpenID Connect provider on cloud.