> ## Documentation Index
> Fetch the complete documentation index at: https://docs.repdata.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Changelog

> Version history and updates for the Research Defender API

<Update label="2025-10-01" description="SEARCH, REVIEW, PREDUPE">
  ## Research Defender API

  Documentation for the Research Defender suite — fraud, duplication, and open-end quality detection.

  ### Products & Endpoints

  **SEARCH**

  * `GET /api/v4/respondents/search/{publishable_key}` — Digital fingerprinting, bot/click-farm detection, duplication scoring, and geolocation checks

  **PREDUPE**

  * Add-on to the SEARCH call via the `destination_platform_id` and `destination_platform_survey_number` parameters
  * `GET /api/v3/respondents/destination_platforms/{private_key}` — Look up available destination platform identifiers

  **REVIEW**

  * `GET /api/v4/respondents/review/{publishable_key}` — Open-end text analysis (GET)
  * `POST /api/v4/respondents/review/{publishable_key}` — Open-end text analysis (POST, supports longer text)

  **Security**

  * `GET /api/v3/respondents/get_token/{publishable_key}` — Generate single-use server-to-server tokens (GETTOKEN)
  * V4 Hashed Validation for SEARCH

  <Note>
    ACTIVITY and VERIFY are hosted on a separate domain (`resdefio.com`) and are documented separately.
  </Note>
</Update>