[Fix] Issue #97 - derivatives_df() API endpoint fix#117
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…ivatives to /api/historicalOR/foCPV - NSE deprecated the old derivatives endpoint which was returning 404 - New endpoint requires 'year' parameter in request - Adds support for current market data (futures and options) - Fixes issue #97 where derivatives_df() was not working
- Added test_derivatives_raw_futures() - tests futures data retrieval - Added test_derivatives_raw_options() - tests options data retrieval - Added test_derivatives_df() - tests DataFrame output for derivatives - All tests pass with new NSE API endpoint - Ensures derivatives_df(), derivatives_csv(), and derivatives_raw() work correctly
- Updated API_REFERENCE.md with note about historical data availability - Updated CHANGELOG.md with v0.33.1 release notes - Bumped version from 0.33.0 to 0.33.1 (patch release) - Documented API endpoint change and data retention limitations
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Problem
Issue #97: derivatives_df() and derivatives_csv() were failing with 404 errors when fetching derivatives data.
The old API endpoint was returning 'Resource not found' errors, making it impossible to retrieve derivatives historical data.
Root Cause
NSE deprecated the old /api/historical/fo/derivatives endpoint. The library was still using this defunct endpoint which now returns 404.
Solution
Changes
Testing
✅ All 12 NSE tests pass (including 3 new derivative tests)
✅ Verified derivatives_df() works with current market data (NIFTY March 2026 options)
✅ Backwards compatible - no API changes for users
Notes