generated: '2026-09-06'
method: searched
source: https://dev.elsevier.com/api_key_settings.html
supporting_sources:
- 'https://dev.elsevier.com/support.html (FAQ: quota reset time and header semantics)'
- 'https://dev.elsevier.com/release_notes.html (2019-07-11: shaped throttling replaced by fixed throttling)'
- live probe of https://api.elsevier.com/content/search/scopus (unauthenticated 401, 2026-09-06) for the
  runtime header set
provider: Elsevier
limit_count: 36
providerId: elsevier
description: Per-API weekly quotas and per-second throttles for the Elsevier Research Products APIs, transcribed
  from the provider's own Default API Key Settings table. Elsevier states plainly that "Quota limits are
  unique to each API, there is not a single global setting for a given APIKey" — so these are per-API-key,
  per-API limits, not tiers.
headers:
  limit: X-RateLimit-Limit
  remaining: X-RateLimit-Remaining
  reset: X-RateLimit-Reset
  reset_format: Unix timestamp (seconds)
  status: X-ELS-Status
  request_id: X-ELS-ReqId
  retryAfter: null
  policy: null
  note: 'X-RateLimit-Limit / -Remaining / -Reset are returned on successful responses. Elsevier documents
    that once the weekly quota is exhausted those two counters STOP being returned and the response instead
    carries X-ELS-Status: QUOTA_EXCEEDED alongside X-RateLimit-Reset — so an agent cannot rely on Remaining
    trending to zero as its exhaustion signal. No Retry-After and no RFC 9238 RateLimit-Policy header
    is emitted.'
responseCodes:
  throttled: 429
  quotaExceeded: 429
  note: Both exhaustion modes return the same status. They are distinguished only by whether X-ELS-Status
    is QUOTA_EXCEEDED (weekly quota) or the X-RateLimit-* counters are still present (per-second throttle).
quota_increase:
  available: true
  process: email API Support with the API key, full institution name, a description of the use case, the
    API name, and the requested quota
  url: https://service.elsevier.com/app/contact/supporthub/researchproductsapis/
  self_serve: false
access_controlled_apis:
  note: Access to these APIs is not enabled on a new key by default and requires review by Elsevier API
    Support, which explicitly "cannot guarantee permission".
  apis:
  - Scopus Citation Overview
  - Scopus Author Feedback
  - ScienceDirect Full-Text Entitlement
  - ScienceDirect Article Hosting Permissions
  - ScienceDirect Holdings Report
  - Embase Search and Retrieval
  - Engineering Village Search and Retrieval
  - SUSHI COP5 API
limits:
- name: Serial Title
  product: Scopus
  scope: api-key
  applies_to_api: Serial Title
  limit: 20000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: STANDARD, COVERIMAGE, ENHANCED views. Default 25 results / max 200 results.
- name: Citations Count Metadata
  product: Scopus
  scope: api-key
  applies_to_api: Citations Count Metadata
  limit: 50000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 10
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: STANDARD view. Default 25 results / max 200 results.
- name: Subject Classifications
  product: Scopus
  scope: api-key
  applies_to_api: Subject Classifications
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst: null
  note: STANDARD view. Default 25 results / max 200 results. Quota and throttle published as N/A.
- name: Abstract Retrieval
  product: Scopus
  scope: api-key
  applies_to_api: Abstract Retrieval
  limit: 10000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 9
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: All views, default FULL view.
- name: Affiliation Retrieval
  product: Scopus
  scope: api-key
  applies_to_api: Affiliation Retrieval
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 9
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: All views, default STANDARD view.
- name: Author Retrieval
  product: Scopus
  scope: api-key
  applies_to_api: Author Retrieval
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 3
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: All views, default STANDARD view.
- name: Affiliation Search
  product: Scopus
  scope: api-key
  applies_to_api: Affiliation Search
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Default 25 results / max 200 results; 5,000 item result limit.
- name: Author Search
  product: Scopus
  scope: api-key
  applies_to_api: Author Search
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 2
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Default 25 results / max 200 results; 5,000 item result limit.
- name: Scopus Search
  product: Scopus
  scope: api-key
  applies_to_api: Scopus Search
  limit: 20000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 9
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: STANDARD view max 200 results; COMPLETE and COMPONENT views max 25 results. 5,000 item total result
    limit unless cursor pagination is used.
- name: Serial Title
  product: ScienceDirect
  scope: api-key
  applies_to_api: Serial Title
  limit: 20000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: STANDARD, COVERIMAGE views. Default 25 results / max 200 results.
- name: Nonserial Title
  product: ScienceDirect
  scope: api-key
  applies_to_api: Nonserial Title
  limit: 20000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: STANDARD, COVERIMAGE views. Default 25 results / max 200 results.
- name: Subject Classifications
  product: ScienceDirect
  scope: api-key
  applies_to_api: Subject Classifications
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst: null
  note: No restrictions on views or results; quota and throttle published as N/A.
- name: Article Retrieval
  product: ScienceDirect
  scope: api-key
  applies_to_api: Article Retrieval
  limit: 50000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 10
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: All subscribed, open-access and complimentary articles. Unlimited for text-mining API keys.
- name: Article Metadata
  product: ScienceDirect
  scope: api-key
  applies_to_api: Article Metadata
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: 25 results, field-restricted search against ScienceDirect serial/nonserial full-text articles;
    6,000 item total result limit. Weekly quota published as N/A.
- name: ScienceDirect Search v2
  product: ScienceDirect
  scope: api-key
  applies_to_api: ScienceDirect Search v2
  limit: 20000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 2
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: STANDARD view max 200 results; 6,000 item total result limit.
- name: SciVal Author Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Author Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Default 100 results / max 500 results. Quota marked with an asterisk on the source table.
- name: SciVal Country Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Country Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Country Group Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Country Group Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Institution Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Institution Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Institution Group Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Institution Group Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Publication Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Publication Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Scopus Source Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Scopus Source Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Subject Area
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Subject Area
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Topic Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Topic Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal Topic Cluster Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal Topic Cluster Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metrics resource; no limit on total results (varies by resource).
- name: SciVal World Lookup
  product: SciVal
  scope: api-key
  applies_to_api: SciVal World Lookup
  limit: 5000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Max 100 results for the Metric resource; no limit on total results (varies by resource).
- name: Scopus Citation Overview
  product: Access-controlled
  scope: api-key
  applies_to_api: Scopus Citation Overview
  limit: 20000
  metric: requests
  window: 7d
  window_note: Quotas reset every seven days; the exact reset instant is per-API and is returned as the
    X-RateLimit-Reset Unix timestamp.
  burst:
    limit: 4
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: STANDARD view. Default 25 results / max 200 results. Access not enabled by default.
- name: Scopus Author Feedback
  product: Access-controlled
  scope: api-key
  applies_to_api: Scopus Author Feedback
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst: null
  note: Quota and throttle published as N/A. Access not enabled by default.
- name: ScienceDirect Full-Text Entitlement
  product: Access-controlled
  scope: api-key
  applies_to_api: ScienceDirect Full-Text Entitlement
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Weekly quota published as N/A. Access not enabled by default.
- name: ScienceDirect Article Hosting Permissions
  product: Access-controlled
  scope: api-key
  applies_to_api: ScienceDirect Article Hosting Permissions
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Open-access information for a single full-text article. Weekly quota published as N/A. Access
    not enabled by default.
- name: ScienceDirect Holdings Report
  product: Access-controlled
  scope: api-key
  applies_to_api: ScienceDirect Holdings Report
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst:
    limit: 2
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Weekly quota published as N/A. Access not enabled by default.
- name: Embase Search
  product: Access-controlled
  scope: api-key
  applies_to_api: Embase Search
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: Default 25 results; no limit on total results. Weekly quota published as N/A. Access not enabled
    by default.
- name: Embase Retrieval
  product: Access-controlled
  scope: api-key
  applies_to_api: Embase Retrieval
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: One document per request. Weekly quota published as N/A. Access not enabled by default.
- name: Engineering Village Search
  product: Access-controlled
  scope: api-key
  applies_to_api: Engineering Village Search
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst: null
  note: Default 25 results. Quota and throttle published as N/A. Access not enabled by default.
- name: Engineering Village Retrieval
  product: Access-controlled
  scope: api-key
  applies_to_api: Engineering Village Retrieval
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst: null
  note: One document per request. Quota and throttle published as N/A. Access not enabled by default.
- name: SUSHI COP5 API
  product: Access-controlled
  scope: api-key
  applies_to_api: SUSHI COP5 API
  limit: null
  metric: requests
  window: 7d
  window_note: Elsevier publishes N/A for this API in the weekly-quota column.
  burst:
    limit: 6
    metric: requests
    window: 1s
    note: Hard throttle. Since the 2019-07-11 release, exceeding it returns HTTP 429 immediately rather
      than queueing the request.
  note: One request per metric type. Weekly quota published as N/A. Access not enabled by default.
summary:
  limit_count: 36
  apis_with_published_weekly_quota: 24
  apis_with_published_throttle: 31
  runtime_headers_published: true