Status 503
not_ready
Not ready yet
Why it happens
The answer waits on a nightly update that has not run yet. The API says so rather than answering an empty list or a guessed zero.
What to do
Retry after Retry-After. A 503 is never billed.
Example
{
"type": "https://unique.domains/api/problems/not_ready",
"title": "Not ready yet",
"status": 503,
"detail": "The nightly sales update has not run yet. Retry in a minute.",
"instance": "/v1/market/sales",
"code": "not_ready"
}