The Market Calendar MCP Server

by marketcalendar Your server? Claim it

answering

The Market Calendar is answering right now. Last checked 2 min ago. It exposes 8 tools.

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

Uptime history 20 days of history · worst day 99%

20 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

413 ms

Response time

average over 24h

open, no key

Access

streamable-http

What changed 5

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 19 October 2026. No other catalogue keeps this.

20 Oct 3 tool descriptions were rewritten day_seasonality, seasonal_trends, window_seasonality

19 Oct a tool description was rewritten seasonal_pattern

19 Oct a tool changed the parameters it asks for seasonal_pattern

Nothing serious here today

Today is the operative word: we check The Market Calendar every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 2 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

Settings → Connectors → Add custom connector, then paste this address

https://marketcalendar.tech/mcp

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 8

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

seasonal

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, options-expiration, pre-holiday, day-of-the-week, midterm-year.

seasonal_trends

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).

assets

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.

day

day_seasonality

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

economic_calendar

Scheduled US economic releases (FOMC, CPI, jobs, PCE, GDP, PPI, retail sales, ISM, JOLTS) in a date range, with US Eastern times.

month

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.

monthly

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'.

window

window_seasonality

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).

Endpoints

URL	Transport	State	Latency	Checked
https://marketcalendar.tech/mcp	streamable-http	answering	394 ms	2 min ago

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The Market Calendar — questions

Answers built from our own checks of this server.

What can The Market Calendar do?

It exposes 8 tools, read directly from the server on our last check. Among them: day_seasonality, economic_calendar, list_assets, month_detail, monthly_seasonality, seasonal_pattern and 2 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is The Market Calendar working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 413 ms. The bar chart above shows every period we have measured.

How do I connect The Market Calendar?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does The Market Calendar need an API key?

No. The Market Calendar completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 8 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is The Market Calendar?

It answers our handshake in 413 ms on average, which is faster than 32% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.