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Research Defender protects survey data quality by detecting fraudulent, duplicate, and low-effort respondents. This documentation covers the three core products — SEARCH, REVIEW, and PREDUPE — and the security options that protect your integration from suppression and link manipulation.
ACTIVITY and VERIFY are hosted on a separate domain (resdefio.com) and are documented separately. This site covers SEARCH, REVIEW, and PREDUPE.

Getting Started

Overview of the Research Defender products and how they fit into your survey flow.

Environments & Authentication

Base URLs and how publishable and private keys are used.

Security Options

Protect against API suppression with V3 server-to-server tokens or V4 Hashed Validation.

SEARCH

Digital fingerprinting, bot and click-farm detection, and duplication scoring.

REVIEW

Open-end text analysis — copy/paste, profanity, engagement, and LLM detection.

API Reference

Full reference for every endpoint — parameters, response schemas, and a live playground.