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Documentation Index

Fetch the complete documentation index at: https://developer.alterscope.org/llms.txt

Use this file to discover all available pages before exploring further.

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Tiers

TierRequests/MinuteRequests/DayNotable features
Free10100Basic yield data
Pro605,000Factor attribution, SHAP, WebSocket
Enterprise30050,000Custom limits, SLA, dedicated support
Limits apply per organization, not per key. Issuing a second key does not double your budget.

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Response headers

Every successful response carries the current state of both windows:
HeaderMeaning
X-RateLimit-Limit-RPMPer-minute limit for your tier
X-RateLimit-Remaining-RPMRequests remaining this minute
X-RateLimit-Limit-RPDPer-day limit for your tier
X-RateLimit-Remaining-RPDRequests remaining today
The minute window resets on the wall clock minute. The day window resets at 00:00 UTC.

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429 handling

When you exceed either window, the API returns: 
HTTP/2 429 Too Many Requests
Retry-After: 30
Content-Type: application/json

{
  "error": {
    "code": "rate_limit_exceeded",
    "message": "Per-minute limit reached. Retry after 30s.",
    "window": "minute"
  },
  "meta": { "request_id": "req_01HX..." }
}
The Retry-After header is in seconds. Honor it. The error.window discriminates minute from day so you can decide whether to backoff or pause for hours.
A simple exponential backoff is fine for the minute window. For the day window, throttle the producer rather than retry the request, otherwise you exhaust the quota the moment it resets.

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Asking for more

Enterprise customers can negotiate per-route uplift or burst windows. Email engineering@alterscope.org with traffic shape and a target peak RPS.