Urlbox does not publish one universal screenshot API rate limit: its per-minute allowance depends on your plan. Check the account’s response headers, queue bulk work at a bounded rate, and honor Retry-After when Urlbox returns an API-level 429. Async rendering can change how your worker receives results, but it does not remove the account quota.
What is Urlbox’s screenshot API rate limit?
Urlbox documents a request limit per minute that varies by customer plan; the reviewed documentation does not establish a single requests-per-minute figure for every account. Confirm the limit for your own account rather than building a bulk job around a number found elsewhere. Urlbox’s rate-limit documentation identifies response headers to inspect, including x-ratelimit-limit, x-ratelimit-remaining, and reset information. Urlbox rate limits
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Record those headers with each response, along with the HTTP status, any Retry-After value, and the request ID when provided. The API reference describes JSON errors that may include a message, code, and request ID. This gives you evidence to distinguish an exhausted quota from a render or configuration problem. Urlbox API reference
How to handle a 429 from Urlbox
- Check which request returned it. An API-level
429means Urlbox is throttling your request. The API reference describes it as “Too many requests — Rate limit was reached.” - Read
Retry-After. Urlbox says the rate-limited response includes this header with the wait time expressed in seconds. Pause for at least that interval; do not immediately resend the same request. - Resume conservatively. After the wait, restart with bounded concurrency and use the remaining and reset headers to guide pacing. Keep recording status and headers so the worker can adapt instead of repeating the same burst.
- Inspect persistent failures. If throttling continues, check your plan’s actual limit and whether other workers are consuming the same account quota. Avoid an unbounded retry loop.
A retry should not be a blind replay. Keep the URL and relevant render options with the failed job, but separate retryable throttling from deterministic errors such as invalid options. Those errors need correction, not repeated requests.
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How to pace bulk screenshot jobs
Use a queue and a fixed, bounded number of in-flight requests. Track the account’s per-minute usage in the worker, but treat Urlbox’s response headers as the source of truth when available. A single shared limiter is preferable when multiple workers use the same account; independent workers can otherwise exceed the shared allowance even if each appears conservative.
Urlbox’s bulk capture guide recommends batch processing and spacing requests for very large sites. That guidance appears on Urlbox’s staging subdomain, so treat it as workflow advice rather than a contractual throughput limit. The guide does not supply a universal batch size, and the reviewed documentation does not establish a best concurrency setting or throughput SLA. Tune batch size and concurrency to your account quota, render duration, retry delays, and completion deadline. Urlbox bulk screenshot guidance
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- Start with a modest queue and bounded concurrency rather than submitting the entire URL list at once.
- Persist job state so a worker restart does not lose completed captures or cause all pending items to be resubmitted.
- Use per-job outcomes to retry only eligible failures, not every item in a partially failed batch.
- Track completion latency as well as request rate: slow renders can increase the number of simultaneous requests even when submissions are paced.
Choose synchronous or asynchronous rendering
| Workflow | Use it when | What to plan for |
|---|---|---|
/v1/render/sync |
The caller needs the generated result in the request-response flow. | The caller must manage response waiting and still pace submissions against the plan quota. |
/v1/render/async |
Your worker can hand off a render and retrieve completion by polling or webhook. | Track the render through completion; asynchronous submission does not bypass the account’s rate limit. |
Both paths are documented by Urlbox. A large asynchronous job still benefits from a client-side queue: async changes how you receive completion, not how many requests your plan permits. Urlbox POST API
When Urlbox’s built-in retries help
Urlbox’s render options include retry_on for selected conditions such as page status 429 and 503, render timeout or crash, and small output size. These are render-level retry controls; they are distinct from handling an API request rejected because your account reached its rate limit. For API throttling, follow the Retry-After header in the client that submits requests.
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The documented retry controls require the Ultra plan or above. The options reference lists max_retries from 0 to 5 (default 2), max_attempts from 0 to 5 (default 3), and retry_delay_ms from 100 to 60,000; exponential waits are capped at 30 seconds. Check the current plan and option documentation before depending on these settings. Urlbox render options
Choose retry conditions deliberately. More attempts can extend a job’s total time and consume additional rendering work. Do not retry invalid configuration or other deterministic failures. Set a bounded attempt count that fits the job’s deadline, and log which condition caused each retry.
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Tell API throttling apart from a target-site block
A 429 can refer to two different layers. An API response from Urlbox may mean your client exceeded its Urlbox account allowance. Separately, a website being rendered may return HTTP 429 or 403 to Urlbox’s renderer. Diagnose the response layer before changing retry behavior: inspect the API response, request ID, and rate-limit headers for a Urlbox throttle; use the render result and page status to investigate a target-site response. Urlbox’s blocked-render guidance discusses these distinct cases. Urlbox guide to avoiding blocks
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A target site can also return a challenge or CAPTCHA page with HTTP 200. Urlbox notes that status-based rules will not detect every such page. Its documented options include checking output size with min_size_bytes and the small_size retry condition, or checking for a known challenge element with a selector. Use a selector tied to the target site’s challenge markup where possible; a generic status retry cannot identify a page that reports success while serving the wrong content.
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For a separate screenshot API option, ScreenshotNeo offers a one-call capture endpoint. Its clean-shot steps can accept cookie or consent banners and remove 60+ known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, with the result identified in response headers. ScreenshotNeo also has an MCP server for AI agents, including Claude, Cursor, and other MCP clients.
Example cURL request (replace YOUR_API_KEY with your key; see the ScreenshotNeo API documentation):
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpThe free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000. Sign up for ScreenshotNeo’s free plan.
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Does async rendering let me exceed my Urlbox plan’s rate limit?
No. Async rendering changes how a render is handed off and completed; it does not remove the account quota.
Should I retry every failed screenshot?
No. Retry only selected transient conditions with a bounded attempt count. Correct deterministic errors such as invalid options instead of replaying them.
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