The Market Calendar

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

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

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "The Market Calendar": {
      "url": "https://marketcalendar.tech/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (8)

• list_assets read-only

  List the markets covered (S&P 500, Nasdaq, Nasdaq-100, Dow, Russell 2000, Bitcoin, Ethereum, Crude Oil, Gold) with their data start dates.

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• monthly_seasonality read-only

  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'.

  Parameters:

  • asset (required) — string

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• month_detail read-only

  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.

  Parameters:

  • asset (required) — string
  • month (required) — string — 1-12 or month name

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• day_seasonality read-only

  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).

  Parameters:

  • asset (required) — string
  • date (required) — string — MM-DD or YYYY-MM-DD

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• window_seasonality read-only

  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).

  Parameters:

  • asset (required) — string
  • start (required) — string — MM-DD
  • end (required) — string — MM-DD, on or after start

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• seasonal_trends read-only

  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).

  Parameters:

  • asset (required) — string
  • year — integer

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• seasonal_pattern read-only

  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.

  Parameters:

  • pattern (required) — string

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

• economic_calendar read-only

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

  Parameters:

  • days — integer
  • start — string — YYYY-MM-DD (default today)

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world no

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