groundhog.markets

markets.groundhogPublished by groundhog.marketsOfficial publisherv1.2.0Updated Oct 30, 2026

groundhog.markets: free weather forecasts in one call, plus Kalshi and Polymarket market rules.

VerifiedStreamable HTTPWeb executableLocation & LifestyleFinance

Overview

AI-generated overview

Free multi-source weather forecasts for any place, plus Kalshi and Polymarket weather market rules and settlement tracking.

What you can do
  • Get daily high/low forecasts for a place from every free source, with median, spread, rain, current observations and active alerts
  • Find places by name, city and state, airport code or coordinates, and fetch a place's 7-day forecast
  • Inspect the open data sources behind the forecasts, with licence, latest run, age and status
  • Look up weather markets in a place, including settlement station, rule, the number so far, the server's value and the official result
  • Check how often the server's settlement value matched the venue's result, including every miss
  • Pull as-issued history for backtests: daily hi/lo/rain per run, NBM text columns, or settlement observations
When to use it
Useful when you want a quick consensus forecast across several free sources for a location, or when you need to check the station, rule and running number behind a Kalshi or Polymarket weather market before or after settlement.
Requirements
Remote streamable HTTP endpoint; no authentication, environment variables or headers declared. Network access to the provider's endpoint is required.
Before you install
The server asks that its credits line be kept and its page URL linked when numbers are repeated. Market tools report rules and settlement values but no prices, so they are not a trading feed. History requests are capped at 366 days and consume units per 31 days.

Installation

In SourceWeft

  1. Open groundhog.markets in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/markets.groundhog%2Fweather/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "groundhog-markets": {
      "type": "http",
      "url": "https://groundhog.markets/mcp"
    }
  }
}

Tools

8

forecast

Forecast blend

Daily high/low for any place from every free forecast: median, spread, rain, current obs and active alerts, with credits and the page URL. line ≈321 tok, week ≈566, table ≈1,567, series ≈1,564. Keep the credits and link the page when you repeat numbers. size=runs: one place, each source's newest runs by day with run_utc and fetched_at; NBM adds XND, P12, Q12. variable=rain: members' share of 0.01 in or more and heavier (n = model families), NBM calibrated, amounts by source, so far today, month to date; rain line ≈647 tok, table ≈1,955.

Parametersallstnwindatedaysrunssizestephoursplacerequiredunitsformat+3 more

places

Find a place

Find a place slug by name, City, ST, airport code or lat,lon; says full blend or grid only.

Parametersqrequiredlimit

sources

Sources

Open sources groundhog uses: licence, latest run, age, status.

Takes no parameters.

markets

Weather markets

Weather markets in a place (Kalshi, Polymarket high/low/rain): settlement station and rule, the number so far under that rule, our value and the official result once settled, forecast daily max/min at the station. No prices. Needs place or family. line ≈526 tok, table ≈1,757; every city ≈36,291. With neither: the list of market cities.

Parametersdatesizeplacefamilyformatcredits

receipts

Market receipts

How often our settle value matched the venue's result, with every miss. No prices.

Parametersdaysvenuefamilyformat

fetch

Fetch a place

The 7-day forecast of a place id from search: {id, title, text, url, metadata}. Keep the credits and link the url when you repeat numbers.

Parametersidrequired

history

As-issued history

As-issued history for backtests (no look-ahead): kind=daily (every source's daily hi/lo/rain per run at a place), nbm (NBM text columns: TXN, XND, P12, Q12; view=day = the books' day view) or obs (settlement truth: CLI, routine-METAR max/min). from/to (<= 366 days, 1 unit per 31 days); run=ISO | lead=N (+cycle=H: the run issued N days before) | asof=ISO (what was known then). Rows carry fetched_at and origin (bf:* = backfilled). TSV by default.

Parameterstoelsrunstnasoffromrequiredkindleadprodviewcycleplace+3 more

Version history

1
  1. v1.2.0LatestOct 30, 2026

Score

83% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.

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