The Market Calendar

tech.marketcalendar/seasonality · v1.0.0 · productivity

The Market Calendar is healthy: it completed an MCP handshake in 589 ms and exposes 8 tools.

Market seasonality by day, window and month for S&P 500, Nasdaq, Dow, Bitcoin, gold and oil.

Endpoint: https://marketcalendar.tech/mcp (streamable-http)

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Facts

Checked (UTC)	Status	Latency	Error
2026-10-18T21:45:34.742Z	Healthy	589

`list_assets`	List the markets covered (S&P 500, Nasdaq, Nasdaq-100, Dow, Russell 2000, Bitcoin, Ethereum, crude oil, gold) with their data start dates.
`monthly_seasonality`	Average and median return, share of years up, best and worst year for each calendar month of an asset. Use for 'what's the best month for X', 'is September bad for stocks'.
`month_detail`	Deep dive on one month for one asset: average, median, % of years up, rank among the 12 months, recent years, the cumulative seasonal path through the month, and its strongest/weakest days.
`day_seasonality`	How an asset has done on a calendar date (e.g. 12-26) across all years: average return, share of years up, and its rank among all calendar days.
`window_seasonality`	Every past year's return over a calendar window (start and end MM-DD in the same year), with average, median, % of years up, best and worst years. Use for 'how does X do from Dec 15 to Dec 31'.
`seasonal_trends`	The bullish and bearish seasonal stretches for an asset in a given year, as shown on The Market Calendar.
`seasonal_pattern`	Statistics for well-known S&P 500 calendar effects: santa-claus-rally, sell-in-may, september-effect, best-days-of-the-year, worst-days-of-the-year, turn-of-the-month, presidential-cycle, january-barometer.
`economic_calendar`	Scheduled US economic releases (FOMC, CPI, jobs, PCE, GDP, PPI, retail sales, ISM, JOLTS) in a date range, with US Eastern times.