A computerized system for Application Programming Interface, API, migration, the system (100, 300) comprising: at least one memory storing instructions; and at least one processor configured to execute the instructions to perform operations comprising: segregating client accounts into a first group, a second group, and a third group, each group having distinct members; assigning a first API for communications with the first group and a second API for communications with the second group; assigning the first API for communications with a first portion of the third group and the second API for communications with a second portion of the third group; collecting, during a time interval, communications from the first group, the second group, and the third group, and generating metrics associated with each group; generating a comparative report comparing the metrics associated with the first group and the metrics associated with the second group; generating a compatibility report based on the metrics associated with the third group; and transmitting at least one of an alert or a recommendation based on the comparative report and the compatibility report, wherein the alert or the recommendation comprises an updated API map comprising one or more rows each including: an API client group, an assigned API, methods associated and/or permitted for the API client group, and test scenarios for the API client group; and a migration API plugin to transfer client account between different APIs. at least one memory storing instructions; and at least one processor configured to execute the instructions to perform operations comprising: segregating client accounts into a first group, a second group, and a third group, each group having distinct members; assigning a first API for communications with the first group and a second API for communications with the second group; assigning the first API for communications with a first portion of the third group and the second API for communications with a second portion of the third group; collecting, during a time interval, communications from the first group, the second group, and the third group, and generating metrics associated with each group; generating a comparative report comparing the metrics associated with the first group and the metrics associated with the second group; generating a compatibility report based on the metrics associated with the third group; and transmitting at least one of an alert or a recommendation based on the comparative report and the compatibility report, wherein the alert or the recommendation comprises an updated API map comprising one or more rows each including: an API client group, an assigned API, methods associated and/or permitted for the API client group, and test scenarios for the API client group; and a migration API plugin to transfer client account between different APIs. segregating client accounts into a first group, a second group, and a third group, each group having distinct members; assigning a first API for communications with the first group and a second API for communications with the second group; assigning the first API for communications with a first portion of the third group and the second API for communications with a second portion of the third group; collecting, during a time interval, communications from the first group, the second group, and the third group, and generating metrics associated with each group; generating a comparative report comparing the metrics associated with the first group and the metrics associated with the second group; generating a compatibility report based on the metrics associated with the third group; and transmitting at least one of an alert or a recommendation based on the comparative report and the compatibility report, wherein the alert or the recommendation comprises an updated API map comprising one or more rows each including: an API client group, an assigned API, methods associated and/or permitted for the API client group, and test scenarios for the API client group; and a migration API plugin to transfer client account between different APIs. API client group, an assigned API, methods associated and/or permitted for the API client group, and test scenarios for the API client group; and a migration API plugin to transfer client account between different APIs.