VERIFICATION

Data Sources & Methodology

Published by ExpiredOptions // Last Updated: August 2026

Data Integrity Overview

To maintain full transparency, this page documents the exact origin, update frequency, timezone, and known limitations of all financial data feeds, market indicators, and portfolio records shown on expiredoptions.com.

All market and calendar times reference U.S. Eastern Time (ET).

Market Indices (S&P 500, Dow Jones, Nasdaq, Russell 2000)

Live / Near Real-Time

Primary Provider / Source: Finnhub Financial Market API / Yahoo Finance WebSocket

Cadence & Limitations: Live during market hours (9:30 AM – 4:00 PM ET), 60-second polling cadence, 15-minute standard exchange delay where applicable.

Earnings Calendar & Estimates

Nightly Sync / Cached

Primary Provider / Source: Finnhub Earnings API / SEC 10-Q & 8-K Filings

Cadence & Limitations: Scanned nightly and cached in Upstash Redis. Updated hourly during market days.

Macroeconomic Events Calendar

Weekly Aggregated

Primary Provider / Source: U.S. Bureau of Labor Statistics (BLS), Federal Reserve FOMC Schedule, Bureau of Economic Analysis (BEA)

Cadence & Limitations: Aggregated weekly from primary government economic release schedules.

Insider Trading Filings (Form 4)

Daily EDGAR Feed

Primary Provider / Source: U.S. Securities and Exchange Commission (SEC EDGAR System)

Cadence & Limitations: Scanned and parsed daily from primary SEC Form 4 XML feeds.

Personal Portfolio & LEAPS Positions

Direct Brokerage Sync

Primary Provider / Source: Robinhood Financial Brokerage Transaction Ledger & Streamlit Admin Engine

Cadence & Limitations: Live SQLite ledger synchronized on demand via secure Upstash Redis bridge.

Options Wheel & LEAPS Calculator Math

Mathematical Model

Primary Provider / Source: Black-Scholes & Standard OCC Expiration Mechanics Formulae

Cadence & Limitations: Calculated client-side in real time based on user inputs.

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