Screenshot API limits are set by each provider: a requests-per-minute cap controls how quickly requests may be started, while concurrency may mean active renders—or, in some APIs, something else entirely. Check the provider’s response headers and account documentation rather than assuming one universal limit.
Requests per minute, concurrency, and monthly quota are different limits
A requests-per-minute limit restricts how many calls can be started during a short time window. The provider chooses the limit and its windowing method; a service may instead document a per-second burst limit. Neither figure automatically tells you how many screenshots can render at the same time.
Concurrency often means the number of active operations, but API providers do not use the term consistently. Monthly quota is separate: you may have quota left but be sending requests too quickly, or stay within the short-window cap and still use up the month’s allowance.
- Request-start limit: How many calls can be started within a short window.
- Active-render limit: How many screenshot jobs can be rendering simultaneously, if the provider defines such a cap.
- Usage quota: The number of successful or billable captures allowed in a billing period, as defined by that provider.
Do not infer active-render capacity from a field named concurrency. ScreenshotOne explicitly says, “The concurrency values are request-bucket values, not active render counts.” In its usage response, concurrency.limit is the number of requests that can be started in the current one-minute bucket, remaining is the number still available before reset, and reset is a nanosecond Unix timestamp. With five remaining, its example permits starting five requests, then waiting for reset. These are ScreenshotOne-specific field definitions, not a general convention. ScreenshotOne Get Usage documentation (checked 2026-10-03).
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Published vendor examples
The following are plan values shown in vendor documentation when checked on 2026-10-03, not a performance test or a standardized comparison. Providers may change limits; confirm the current documentation and your own account’s settings before relying on a figure.
| Service and plan | Short-window request limit | Monthly allowance |
|---|---|---|
| ScreenshotNeo | Depends on plan; documentation describes request-per-minute and simultaneous-render limits but does not give a complete numeric plan table in the portion checked | Not stated in the cited documentation |
| Screenshot API (screenshot-api.org), Free | 60 requests per minute | 500 screenshots |
| ScreenshotEngine, Free | 5 requests per minute | 50 screenshots |
| ScreenshotEngine, Starter | 40 requests per minute | 3,000 screenshots |
| ScreenshotEngine, Professional | 100 requests per minute | 15,000 screenshots |
| ScreenshotEngine, Engine | 250 requests per minute | 60,000 screenshots |
| Screenshot API (screenshot-api.net), Free | 1 request per second | 100 renders |
| Screenshot API (.net), Starter | 5 requests per second | 2,000 renders |
| Screenshot API (.net), Pro | 10 requests per second | 10,000 renders |
| Screenshot API (.net), Team | 25 requests per second | 25,000 renders |
| Screenshot API (.net), Business | 50 requests per second | 100,000 renders |
The two services named Screenshot API are distinct: the per-minute figures above belong to screenshot-api.org, while the per-second figures belong to screenshot-api.net. ScreenshotEngine says failed requests remain subject to rate limiting even though they do not count toward its successful-capture allowance. Its documentation also distinguishes a rate-limit 429 from a monthly-quota 429. See ScreenshotEngine’s errors and limits documentation for its current definitions.
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How to handle a 429 response
HTTP 429 means the service is refusing requests for a limit-related reason, but the response details determine what to do next. It may indicate a temporary request-rate cap, a simultaneous-render limit, or a depleted quota. Read the body and headers before retrying.
- Inspect the response. Check the error body,
Retry-Afterif present, rate-limit headers, and quota headers. For screenshot-api.org, documented headers includeX-RateLimit-Limit,X-RateLimit-Remaining,X-RateLimit-Reset,X-Quota-Remaining, andX-Quota-Reset. - If a short-window limit is exhausted, pause starts. Wait until the supplied retry or reset time. If the API exposes remaining capacity and reset information, use them to pace queued work instead of releasing a burst of requests.
- If the monthly quota is exhausted, stop retrying. Wait for the quota period to reset or change the plan or workload. Repeated rapid calls do not restore quota.
- If a temporary 429 or 503 has no retry time, back off carefully. ScreenshotEngine advises a short delay that increases on each retry, with jitter and no more than three retries in its example. Avoid retrying invalid input, invalid credentials, or exhausted quota.
- Account for timeouts. A client timeout does not prove the capture failed on the server. Retrying may create another successful, billable capture.
Keep API credentials out of public query strings and logs. Screenshot API (.net) warns that query-string keys may be exposed and recommends a bearer header for production calls; follow the authentication method documented by your own provider.
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Pacing a queue without guessing at concurrency
For bulk capture, pace request starts according to the provider’s documented window and live remaining/reset data. If the provider publishes a separate simultaneous-render cap, enforce that too. When it does not, do not invent one from a rate-limit field; use the provider’s documentation and observed response semantics to decide how to manage in-flight work.
- Track short-window usage separately from period quota.
- Use a queue or rate limiter to control starts, and honor reset times rather than sending a large burst.
- Retry only errors that may be temporary, with bounded backoff and jitter.
- Compare providers on window type, active-render semantics, what counts toward quota, enforcement scope, usage headers or endpoints, and 429 guidance—not requests per minute alone.
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ScreenshotNeo is a screenshot API with an MCP server for AI agents. Its documentation describes plan-dependent request-per-minute and simultaneous-render limits, a 429 rate_limited / concurrency_limit response, and directs clients to Retry-After. It does not give a complete numeric plan table in the documentation portion checked. Its response headers also identify page verdict and billing status, including when an outcome is not billed.
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One GET request can return a screenshot or PDF. For example, this cURL call saves a WebP capture of Stripe:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for authentication and request options. ScreenshotNeo removes cookie and consent banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are not billed; AI agents can take screenshots through its MCP server; and the Free plan includes 1,000 screenshots per month with no card, while paid plans start at $5 for 3,000. Learn about ScreenshotNeo or sign up free for 1,000 screenshots a month with no card.
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FAQ
Does a 429 always mean I sent too many requests per minute?
No. Depending on the provider, it can also mean an active-render restriction or an exhausted usage quota. The response body and headers distinguish the cause.
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Can I convert requests per second into requests per minute?
Multiplying gives a rough arithmetic equivalent, not a guarantee that the provider allows the same pattern over a minute. A per-second burst limit and a per-minute bucket are different enforcement rules.
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