specification: API Commons Rate Limits
specificationVersion: '0.1'
provider: Landmark Information Group
providerId: landmark-information
generated: '2026-07-26'
method: searched
created: '2026-07-26'
modified: '2026-07-26'
tags:
- Rate Limiting
- Property Data
- Conveyancing
description: >-
  Landmark publishes explicit per-caller rate limits in the documentation text of two of its five
  public APIs - 1,000 calls per minute per caller on the Document Vault API and 250 requests per
  customer per minute on the Milestone Notification Service. The Compliance/Order, Conveyancing and
  Intelliworks APIs declare a 429 response and the 42900 error code but do not publish a numeric
  limit. No RateLimit or Retry-After response headers are documented on any API.
sources:
- https://www.landmarkcloudservices.com/?api=document-vault-experience
- https://www.landmarkcloudservices.com/?api=milestone-service-api
- openapi/landmark-information-document-vault-api-openapi.yml
- openapi/landmark-information-milestone-notification-service-api-openapi.yml
headers:
  requestId: traceresponse
  rateLimit: null
  retryAfter: null
responseCodes:
  throttled: 429
  throttledErrorCode: '42900'
limits:
- name: Document Vault API calls
  api: Landmark Document Vault API
  scope: caller
  metric: requests_per_minute
  limit: 1000
  timeFrame: minute
  source: https://www.landmarkcloudservices.com/?api=document-vault-experience
- name: Milestone Notification Service requests
  api: Landmark Milestone Notification Service API
  scope: customer
  metric: requests_per_minute
  limit: 250
  timeFrame: minute
  source: https://www.landmarkcloudservices.com/?api=milestone-service-api
unpublished:
- api: Landmark Order Experience API
  note: 429 and error code 42900 declared, numeric limit not published.
- api: Landmark Conveyancing Experience API
  note: 429 and error code 42900 declared, numeric limit not published.
- api: Landmark Intelliworks APIs
  note: 429 and error code 42900 declared, numeric limit not published.
payload_limits:
- api: Landmark Document Vault API
  rule: One document per upload call
- api: Landmark Document Vault API
  rule: Up to 60 documents per vault
- api: Landmark Document Vault API
  rule: 25 MB maximum per file
- api: Landmark Document Vault API
  rule: 'Accepted file types: PDF, DOC, DOCX, JPEG, PNG'