Researchers & Developers

The data behind
human decisions.

The Regret Index is building the world's most comprehensive structured dataset of real-world decision outcomes. Academic researchers, data scientists, and developers can access this data through our API or via dataset licensing.

Access Levels
Community
Free
  • ◆ 100 API calls/day
  • ◆ Basic search endpoint
  • ◆ Aggregated category stats
  • ◆ No auth required
Start for free →
Research
$49 / mo
  • ◆ 10,000 API calls/day
  • ◆ Full semantic search
  • ◆ Regret curve data
  • ◆ Longitudinal follow-up data
  • ◆ CSV export
  • ◆ Academic citation support
Apply for access →
Dataset License
Custom
  • ◆ Full bulk export
  • ◆ Custom filters & slices
  • ◆ Dedicated support
  • ◆ Co-authorship discussions
  • ◆ GDPR-compliant delivery
Contact us →
API Reference
MethodEndpointDescription
GET/api/v1/decisions/searchFull-text + semantic search with filters
GET/api/v1/stats/{category}Aggregate statistics for a decision category
GET/api/v1/regret-curve/{category}Time-series regret score distribution
Authentication

API keys are issued after signup and plan selection. Include your key as a Bearer token in the Authorization header of each request. Keys can be rotated from your account settings.

Academic Citation

Citing the dataset in your research

The Regret Index Dataset (2026). Structured outcomes of human life decisions — Vol. I. Regret Index Ltd. https://regretindex.com. doi: pending.

DOI registration is pending. If you are using the dataset before DOI assignment, contact research@regretindex.com for pre-publication attribution guidance.

Get in touch

Research collaborations, bulk data requests, or dataset licensing enquiries — we respond to academic and institutional requests within 48 hrs.

Contact Research Team →