MCP server

The Market Calendar

tech.marketcalendar/seasonality

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Seasonality by month for 9 markets, S&P 500 day by day this month, and US economic release dates.

Website

At a glance

Type

MCP server

Publisher

marketcalendar.tech (verified by the MCP Registry)

Status

Working at last check

Tools

8

Token cost

About 1,075 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http seasonality https://marketcalendar.tech/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.seasonality]
url = "https://marketcalendar.tech/mcp"

Gemini CLI

{"mcpServers":{"seasonality":{"httpUrl":"https://marketcalendar.tech/mcp"}}}

Cursor

{"mcpServers":{"seasonality":{"url":"https://marketcalendar.tech/mcp"}}}

VS Code

{"servers":{"seasonality":{"type":"http","url":"https://marketcalendar.tech/mcp"}}}

Antigravity

agy mcp add seasonality https://marketcalendar.tech/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"seasonality","server_url":"https://marketcalendar.tech/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"seasonality","server_url":"https://marketcalendar.tech/mcp"}

Tools

• day_seasonality ~157 tokens
  How an asset has done on a calendar date across all years: average return, share of years up, rank among all days. Free for the S&P 500 in the current month; other assets/months return that month's free numbers and a Pro link (pro_required).
• economic_calendar ~98 tokens
  Scheduled US economic releases (FOMC, CPI, jobs, PCE, GDP, PPI, retail sales, ISM, JOLTS) in a date range, with US Eastern times.
• list_assets ~65 tokens
  List the markets covered (S&P 500, Nasdaq, Nasdaq-100, Dow, Russell 2000, Bitcoin, Ethereum, Crude Oil, Gold) with their data start dates.
• month_detail ~141 tokens
  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.
• monthly_seasonality ~119 tokens
  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'.
• seasonal_pattern ~187 tokens
  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, options-expiration, pre-holiday, day-of-the-week, midterm-year.
• seasonal_trends ~128 tokens
  Bullish and bearish seasonal stretches as shown on The Market Calendar. Free: the S&P 500's trends touching the current month; the full year and other assets are Pro (link included).
• window_seasonality ~180 tokens
  Every past year's return over a calendar window (start and end MM-DD), with average, median, % of years up, best and worst years. Free for S&P 500 windows inside the current month; otherwise returns the covered months' free numbers and a Pro link (pro_required).

Browse

• Calendars
• Stocks and markets
• Crypto and blockchains
• Government and public data

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