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Growth Planner API
Plot a student's projected growth using Lexile or Quantile measures.
API Calls
Getting Started with API Access
To access the API, partners must authenticate using the OAuth 2.0 Client Credentials flow. This ensures secure, token-based access for approved applications.

APIs
- Scoring Service API
  Assigns an ability estimate to an assessment-taker in the form of a Lexile Reading, El Sistema Reading, or Quantile measure.
- Lexile Text Analyzer API
  Analyzes text to produce Lexile text measures on custom content.
- Titles API
  Access more than 470,000 hardcover, e-books, paperback, trade and other titles.
- Forecasting API
  Forecast an individual student or group performance on an upcoming assessment.
- Growth Planner API
  Plot a student's projected growth using Lexile or Quantile measures.
  - About Growth Planner API
    The Growth Planner provides authorized partners with secure, real-time access to key student predictive growth data. It is designed to automate data exchange, streamline integration workflows, and support timely insights within your own platform or tools.
  - API Calls
    - Getting Started with API Access
      To access the API, partners must authenticate using the OAuth 2.0 Client Credentials flow. This ensures secure, token-based access for approved applications.
    - Authentication – Retrieve an Access Token
      POST/authToken: Retrieve an Auth Token for use with protected endpoints.
    - Growth Planner Chart API Overview
      An API to generate Lexile and Quantile Growth Charts.
    - Chart Generation - Summative Data
    - Chart Generation - Interim Data
    - API Schema Reference
  - Growth Planner FAQ
  - Support and Feedback
    If you need help with setup, troubleshooting, or have a technical question about our product, our support team is here to help.
- Oral Reading API
  Measures a student's oral reading ability and the oral readability of text on the same scale.
- PowerV API
  Create and access vocabulary lists for over thousands of titles with the Titles Database.
- Career Database APIs
  Identify a career’s reading and math demands in Lexile and Quantile metrics for goal setting and career preparedness.

Getting Started with API Access

To access the API, partners must authenticate using the OAuth 2.0 Client Credentials flow. This ensures secure, token-based access for approved applications.

To obtain an access token, contact your Partner Success representative.

Your Partner Success representative will need the name, email, and role of the person responsible for API integration on the partner’s side.
You will be provisioned with client credentials: client_id and client_secret, and granted access to the appropriate API scopes.
Access tokens expire after 30 days. Once expired, you will need to refresh them by repeating the token request.
Keep your client_id and client_secret confidential.