When the API_TYPE argument is set to "aws-sagemaker", API_Request in-database function works with Amazon SageMaker. The syntax is:
SELECT * FROM tapidb.API_Request( ON { table | view | (query) } [ AS InputTable ] USING AUTHORIZATION ('{"Access_Id": "AWS_access_id", "Access_Key" :"AWS_Access_Key", "Session_Token": "AWS_Session_Token", "Region" : "aws_region"}') ENDPOINT ('sagemaker-endpoint') [TARGET_MODEL ('sagemaker-target-model')] [CONTENT_TYPE ({'json' | 'csv'})] [ENDPOINT_URL ('sagemaker-url')] [API_TYPE('aws-sagemaker')] [KEY_START_INDEX('0')] ) AS alias;