Site24x7's REST API lists every monitor on the account with GET https://www.site24x7.com/api/monitors, and supports narrowing the pull with a monitor_ids filter.
Call GET https://www.site24x7.com/api/monitors with a Zoho OAuth token. The documented curl examples return the full monitor objects; add ?monitor_ids=... when you only want a subset, which is useful if you are migrating one client at a time.
Site24x7 documents monitor-level report endpoints in the same API reference, but we could not isolate a confirmed historical-uptime export endpoint on 4 August 2026. Plan on downloading the reports you care about from the UI before you leave.
Export mechanics verified on 2026-08-04 against Site24x7's own documentation.