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0DTE Options Backtester with Realistic Fills
A specialized backtesting platform built exclusively for 0DTE index options strategies, featuring tick-level historical data, realistic bid-ask spread and slippage modeling, regime-aware performance attribution, and tail-risk fragility scoring. The platform would address the core complaint that generic backtesters produce misleading results for 0DTE strategies.
Why this matters
You trade 0DTE index options and have a strategy idea you want to validate before risking real capital. You try existing backtesting tools but they use mid-price fills that dramatically overstate returns for 0DTE options where bid-ask spreads are wide. When you test with real money, the results don't match your backtest. You have no way to see how your strategy performs on trend days versus range days, or how it would have survived specific volatile events. The worst part is discovering that a handful of bad days can wipe out years of gains, something no existing tool warned you about. You need a backtester built specifically for the unique characteristics of 0DTE options.
- · Built for Active retail and semi-professional options traders who trade 0DTE SPX/NDX credit spreads and iron condors, typically managing $20K-$200K in options collateral.
- · Most likely monetization: SaaS subscription.
The Pain · Narrative
You trade 0DTE index options and have a strategy idea you want to validate before risking real capital. You try existing backtesting tools but they use mid-price fills that dramatically overstate returns for 0DTE options where bid-ask spreads are wide. When you test with real money, the results don't match your backtest. You have no way to see how your strategy performs on trend days versus range days, or how it would have survived specific volatile events. The worst part is discovering that a handful of bad days can wipe out years of gains, something no existing tool warned you about. You need a backtester built specifically for the unique characteristics of 0DTE options.
Score Breakdown
Market Signal
Go-to-Market
Active retail options traders executing 0DTE SPX or NDX credit spreads at least weekly, managing $20K-$200K in collateral
~15,000 active 0DTE traders in the US who would benefit from specialized backtesting
Organic posts in options trading communities with free strategy analysis teardowns
$79/month for full backtesting access, $29/month for basic tier
25 paying subscribers within 30 days of launch from organic community engagement
MVP Scope · 1–2 weeks
- Secure historical SPX 0DTE options data provider and validate data quality for 2+ years of tick-level history
- Build core backtesting engine in Python with configurable spread construction (credit spreads, iron condors) for SPX 0DTE
- Implement realistic fill model using bid-ask spread data with configurable slippage and commission parameters
- Create basic web UI for defining strategy rules (entry time, strike selection, spread width) and running backtests
- Develop regime classification logic to tag each historical day as trend, range, or high-volatility
- Add performance attribution dashboard showing P/L breakdown by market regime, day of week, and volatility level
- Implement tail-risk analysis module with worst-N-days visualization and fragility scoring
- Add strategy comparison feature allowing users to run the same strategy with different parameters side by side
- Create event-risk calendar that flags FOMC, CPI, and other known high-impact days in backtest results
- Build onboarding flow with sample strategy and tutorial showing how realistic fills differ from mid-price assumptions
Differentiation
Why This Might Fail
Self-rebuttal — the most important trust signal
- 1Intraday options data licensing costs from exchanges like CBOE could exceed $10K/month, making the product uneconomical below 150 subscribers
- 2Users may be unwilling to pay $79/month when free tools like ThinkOrSwim offer basic backtesting, even if inferior for 0DTE
- 3Regulatory scrutiny on options analysis tools could require expensive compliance infrastructure and legal review before launch
Evidence Summary
How AI synthesized this insight — no verbatim quotes
Approximately 8 commenters expressed frustration with backtesting quality for 0DTE strategies. Multiple users highlighted that mid-price fills overstate returns, that generic tools lack regime-aware analysis, and that the gap between backtested and real-world results is significant. One user abandoned backtesting entirely in favor of risking real capital. Several users requested specific features like worst-case loss analysis, regime breakdowns, and realistic fill modeling. The intensity of pain is high given users are risking $30K+ per strategy set on unvalidated approaches.
Action Plan
Validate this opportunity before writing code
Recommended Next Step
Build
Strong demand signals detected. Real pain, real willingness to pay — start building an MVP.
Landing Page Copy Kit
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Headline
0DTE Options Backtester with Realistic Fills
Sub-headline
A specialized backtesting platform built exclusively for 0DTE index options strategies, featuring tick-level historical data, realistic bid-ask spread and slippage modeling, regime-aware performance attribution, and tail-risk fragility scoring. The platform would address the core complaint that generic backtesters produce misleading results for 0DTE strategies.
Who It's For
For Active retail and semi-professional options traders who trade 0DTE SPX/NDX credit spreads and iron condors, typically managing $20K-$200K in options collateral
Feature List
✓ Tick-level historical 0DTE SPX/NDX options data with bid-ask spreads ✓ Configurable slippage, commission, and fee modeling for realistic fill simulation ✓ Regime-aware performance breakdown (trend/range/vol days, event days) ✓ Tail-risk and fragility scoring with worst-case scenario analysis ✓ Strategy comparison and parameter optimization across multiple entry times
Where to Validate
Share your landing page in r/r/options — that's exactly where these pain points were discovered.
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