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There is no per-key rate limiter — you will never receive a 429.

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Regions

Set the region with payload.country (ISO 3166-1 alpha-2). It defaults to US.
A few taskType × country combinations cannot be served — those are rejected at submit time with 422 REGION_UNSUPPORTED rather than queued to fail later.

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Best practices

1

Use batch submission

One POST /v1/async/task/batch with 500 items costs one round trip. Five hundred single submissions cost five hundred.
2

Use priority to order work

A high priority moves a task to the front of the queue.
3

Monitor your queue

GET /stats exposes queue depth and task states. Use it to pace large submissions.