How-to Backtesting

Backtesting with Kite historical API

From WebNotes, a public knowledge base. Last updated 19 June 2026. Reading time ~4 min.

Conflict-of-interest disclosure. This guide is published by the WebNotes Editorial Team for informational purposes and is written independently. WebNotes operates a Zerodha account-opening referral programme, disclosed on the pages that carry the referral link; this guide does not carry it and earns no referral commission from the procedure described here.

Step-by-step procedure

Per the procedure infobox.

Libraries

backtrader (Python): Full backtesting framework.
vectorbt (Python): Vectorized fast backtests.
Custom code: Pandas + NumPy for simple strategies.

Common pitfalls

Lookahead bias: Using future data in signal generation.
Survivorship bias: Only testing on currently-listed stocks.
Optimistic fills: Assuming you got the closing price always.
Ignoring slippage: Real fills differ from candle close.
Ignoring costs: Brokerage, STT, exchange fees materially affect P&L.

Walk-forward validation

Train on 60-70% of data, test on rest. Avoid over-fitting.

Risk

Past performance doesn’t guarantee future results. Backtest results are not investment advice. For complex strategies with significant capital, consult a SEBI-registered Investment Adviser.

External references

References

Zerodha, Kite Connect historical API, kite.trade.
backtrader project, Documentation, backtrader.com.

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WebNotes Editorial Team

The WebNotes Editorial Team covers Indian capital markets, payments infrastructure and retail investor procedures. Every article is fact-checked against primary sources, principally SEBI circulars and master directions, NPCI specifications and the official support documentation published by the intermediary in question. Drafts go through a second-pair-of-eyes review and a separate compliance read before publication, and revisions are tracked against the SEBI and NPCI rule changes referenced in the methodology section.

Last reviewed: 19 June 2026
Conflicts of interest: WebNotes is independent. No relationship with any broker, registrar or bank named in this article.