The endpoint should be as below for check-block but the abuseipdb app comes with Shuffle inside has the path error. https://github.com/Shuffle/openapi-apps/blob/73c76077fff062289ce499314e247f5e0c6b530d/abuseipdb.yaml#L22 In the Shuffle the app calls check_block so it gives error. It is downloaded from cloud i think so it should be corrected from there.