Retrieves the status of up to 500 jobs in one request, each identified by its UUID and payload hash. Every pair gets one entry in the response, in request order: 'found' with the job, 'not_found', or 'rate_limited' with retryAfter in seconds. A missing job does not fail the request. Each pair counts against its own limit of 20 checks per minute, shared with the single status check. The request itself is also rate-limited per IP address: over that limit it gets 429 with Retry-After in seconds. No authentication is required.