temporal_history_unavailable

The requested point in time predates retained payload history.

What it means: as_of or updated_since is earlier than coverage.point_in_time_floor. The API returns a typed refusal instead of an empty page, because an empty page would read as "nothing happened" when the truth is "we cannot say".
What to do: Use a timestamp at or after the floor, which is published on every response and in the detail field.
Retry: Fix the request; do not retry as sent.
Who changes what: The caller. The request as sent cannot be answered; the detail field says why.
On the wire: Content-Type: application/problem+json
{"type":"https://www.veridionmarkets.com/data-api/problems/temporal_history_unavailable","code":"temporal_history_unavailable","status":400,…,"request_id":"…"}

Documented for version 1.3.5. The request_id in the body equals the X-Request-ID header; quote it to support@veridionmarkets.com. All problems · API page