Free options tools for
traders and API builders.
Every tool here is built from the same endpoint surface you can use in your own app, script, dashboard, or research workflow. Use the browser tool first, then grab a key when you want to automate it.
Tools index
Browse the tools first, then build your own version with the API
Each card shows what the tool does, who it is for, and the main endpoint you would wire up if you want to move from a browser workflow into code.
Endpoint Coverage Matrix
What it does
Map backtesting, 0DTE, dashboard, and scanner workflows to the exact endpoint groups they need before comparing providers.
Who it's for
API buyers, developers planning integration scope, and teams translating product requirements into endpoint coverage.
API Cost Calculator
What it does
Estimate daily and monthly request volume from tickers, expirations, chain refreshes, selected contracts, quote windows, trades, and snapshots.
Who it's for
Founders, engineering leads, and researchers sizing a production API workflow before choosing a plan.
Vendor Checklist
What it does
Turn an options-data vendor comparison into a practical checklist for contracts, expirations, chains, quotes, trades, Greeks, docs, and pricing.
Who it's for
Teams comparing providers without reducing the decision to vague coverage claims or unverifiable feature lists.
Options Greeks Calculator
What it does
Model Black-Scholes prices and Greeks instantly, or switch into live mode to pull current market inputs from a real options chain.
Who it's for
Developers prototyping risk dashboards, traders checking pricing assumptions, and anyone who wants a fast Greeks sanity check.
OCC Symbol Decoder
What it does
Decode OSI option tickers into underlying, expiration, contract type, and strike so you can validate symbols before querying contracts or snapshots.
Who it's for
Developers parsing broker exports, researchers validating contract IDs, and teams building contract lookup workflows.
IV Skew Explorer
What it does
Scan ATM IV, 25-delta wings, and risk reversals across a watchlist to spot names where downside and upside volatility are priced differently.
Who it's for
Volatility traders, research teams, and developers building skew monitors or watchlist dashboards.
Unusual Options Activity Scanner
What it does
Rank contract activity by volume, premium, volume/open-interest pressure, spread quality, DTE, IV, and moneyness across a watchlist.
Who it's for
Traders screening option flow, developers prototyping alert logic, and teams validating which chain fields matter before automating.
Backtest Realism Checker
What it does
Score an options backtest setup for stale-contract risk, quote availability, spread cost, last-price dependence, and liquidity evidence.
Who it's for
Researchers validating historical fills, developers building options simulators, and teams reviewing whether a backtest is causal enough to trust.
Options Slippage Calculator
What it does
Convert bid, ask, last, midpoint, contract count, and fill assumptions into per-contract drag, total dollar drag, and breakeven move.
Who it's for
Traders sizing execution costs, founders estimating data requirements, and developers making fill assumptions explicit in research tooling.
Options Liquidity Scanner
What it does
Rank contracts by spread quality, volume, open interest, quote midpoint, IV, and delta with chain heatmaps and strike-level diagnostics.
Who it's for
Scanner builders, systematic traders, and dashboard teams deciding which contracts are liquid enough to model or display.
Put/Call Ratio Dashboard
What it does
Track the current total, equity, and index put/call ratios with daily, weekly, and monthly historical context.
Who it's for
Alert builders and research teams turning market-wide option flow into sentiment features.
Options Chain Visualizer
What it does
Inspect IV smile, spread by strike, volume versus open interest, and chain heatmap views from the same chain snapshot.
Who it's for
Developers and traders who need a quick visual audit of chain shape before writing scanner or backtest logic.
Expiration Calendar
What it does
Track weekly, monthly, and quarterly expirations in one place so you can plan roll windows, event trades, and options calendar logic.
Who it's for
Traders planning expiry-sensitive strategies and developers building date pickers, schedule logic, or event tooling.
Put/Call Ratio Scanner
What it does
Build a segmented put/call ratio scanner with chain volume, open interest context, expiration buckets, and liquidity controls.
Who it's for
Python developers, alert builders, and researchers turning option volume imbalances into watchlist signals.
High-intent guides
Exact-answer pages for expiration dates, OCC symbols, and API classification
These pages answer the calendar and parser questions traders search for before they build a tool or query the API.
Learn Options From Zero
A beginner-first path through calls, puts, chains, Greeks, IV, paper trading, and risk.
Options Data API Evaluation Framework
Workflow-first provider evaluation for endpoints, historical validation, pricing, and implementation risk.
Options Expiration Data Workflow
Use calendar context, listed expirations, date filters, and ticker pages in the right order.
Expiration Calendar
Monthly, weekly, and ticker-specific expiration workflows in one place.
Next OpEx Date
Immediate June 18, 2026 monthly and quarterly OpEx answer plus nearby weekly context.
2026 Options Expiration Dates
Monthly OpEx, June 18, quarterly expiration months, LEAPS notes, and holiday moves.
SPX Options Dates
Standard SPX monthly cycles, SPXW context, and AM/PM settlement caveats.
SPY 2026 Expirations
SPY weekly and monthly dates, including January 9 and the June 18 holiday-adjusted cycle.
VIX Expiration Calendar 2026
Standard VIX options expiration dates, last trading days, and related SPX cycles.
Why VIX Expires Before SPX
The 30-day VIX rule, related SPX monthly cycles, and last-trading-day caveats.
OCC Symbol Format
Parser-focused OSI examples for GLDM, SPY, QQQ, and SPXW option tickers.
Weekly Options Classification API
Classify listed dates as weekly, monthly, quarterly, or LEAPS in code.
Expiration Date Filters API
Exact, inclusive, and exclusive expiration_date filters for contract lookups.
Options Aggregates API Guide
Historical OHLC bars, VWAP, missing intervals, and detailed backtesting use cases.
Put/Call Ratio API
Build sentiment scanners with volume ratios, open-interest context, and expiration segmentation.
Why Options Backtests Fail
A technical checklist for survivorship leakage, stale contracts, wide spreads, and unsupported fill assumptions.
Options Slippage Modeling
Translate bid/ask spreads and fill models into measurable drag before trusting strategy output.
Mid Price vs Fill Price
Separate midpoint reference prices from executable fill assumptions in options research.
Bid/Ask Spread Backtesting
Use spread width as both a liquidity gate and execution-cost input.
Quote vs Trade Timeline
Read bid, ask, midpoint, and print timelines together when validating modeled entries.
Endpoint Coverage Matrix
Map chains, contracts, expirations, quotes, trades, aggregates, snapshots, and Greeks to workflows.
Options API Cost Calculator
Estimate request volume for scanners, dashboards, quote windows, trade windows, and backtests.
Options Vendor Checklist
Evaluate providers across historical contracts, quote history, trades, bars, docs, limits, and pricing.
Build your own with the API
The site tools are just the thin end of the wedge
Use the same endpoints behind these tools to build watchlist scanners, option dashboards, expiry-aware workflows, and research scripts. Start with the docs if you want the full payload shape, then move into a real API key when you are ready to automate.