How 45,000 stocks, ETFs, commodities and forex pairs behaved in each month over up to 25 years, plus SEC company data. Through a REST API, or straight inside ChatGPT and Claude.
Average and median return, win rate, best and worst year for each calendar month, the same profile shown on every symbol page.
The current seasonal window of a symbol, the strongest historical months across the market and its behaviour ahead of macro releases.
Fundamentals, insider transactions, institutional (13F) and fund (N-PORT) holdings, dividends and filings.
Connect ChatGPT or Claude to our MCP server and ask about seasonality in plain language.
API access comes with your SeasOptima account: what is free on the site is free in the API, and Premium unlocks the rest.
| Plan | Includes | Requests |
|---|---|---|
| Free | SEC company data and the monthly profile of every symbol | 500 / day |
| Premium | Everything in Free plus seasonal windows, rankings and macro-event behaviour | 10,000 / day |
| Premium + AI | Everything in Premium plus AI company reports in 6 languages and higher limits | 50,000 / day |
Our MCP server lets AI assistants look up seasonality for you. No key needed: it serves the data that is public on the site, with a link to each symbol's page.
Connector support depends on your assistant and plan. Usage is limited per network address.
Company data comes from the U.S. SEC and other public sources, processed by SeasOptima; seasonality statistics are computed by SeasOptima. Full list of sources and licences
Currency conversions use European Central Bank reference rates, which are available free of charge at ecb.europa.eu.
Historical statistics only. Past seasonal behaviour does not predict future returns. Not investment advice.