Koskamo

PlainQuant MCP

An official MCP server providing read-only access to historical US and Hong Kong stock market data, including backtests of trading rules, event studies for market reactions to economic data, and trend/business scores for specific stocks.

Visit PlainQuant

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

PlainQuant MCP logo, by PlainQuantVendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-08Operated by PlainQuant
MCP endpoint (Streamable HTTP)
https://plainquant.com/mcp
Vendor documentation

What its tools do

3 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (3)

3 of 3 have a description · 3 of 3 declare behavior hints · 0 of 2 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to plainquant.com ·
  • Passed Endpoint is on the registry namespace domain ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • List available market events for historical analysis
  • Retrieve market performance data after specific events like Fed decisions or CPI releases
  • Check trend and business scores for US and HK stocks

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: com.plainquant/plainquant@1.0.0Project website

Protocol and capabilities

Server
plainquant 1
MCP protocol negotiated in check
2025-11-25
Tools
3 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

PlainQuant reports what US stocks did after past market events and how stocks score today, from its own data. Quote the figures as past results with the page url; they are not a forecast or advice. Call list_events (or read event_study's enum) to pick an event id; check_stocks takes tickers, HK codes or company names. Past results, not a forecast or advice.

Tools

3 advertised

list_events — List market events
Advertised by the server during the last successful anonymous check.
Advertised read-only

The events PlainQuant has history for (Fed decisions, CPI, jobs reports, US elections, quarterly options expiry, market drops), with ids, names in English and Chinese, and aliases.

list_events input schema
{
  "type": "object",
  "properties": {},
  "additionalProperties": false
}
list_events annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
event_study — What the market did after an event
Advertised by the server during the last successful anonymous check.
Advertised read-only

For each past occurrence of the event, the move of the equal-weighted US stock market 2 weeks, 4 weeks and 3 months later (fractions: 0.037 = +3.7%), plus median, share up, worst and best beside any window of the same length. With too few occurrences only the list is given. Use for questions like 'what happens to stocks after a midterm election / an FOMC meeting'.

event_study input schema
{
  "type": "object",
  "required": [
    "event_id"
  ],
  "properties": {
    "event_id": {
      "enum": [
        "us_cpi_release",
        "us_fomc_decision",
        "us_jobs_report",
        "us_market_down_day_3",
        "us_market_drop_10",
        "us_market_drop_20",
        "us_midterm_election",
        "us_presidential_election",
        "us_quad_witching"
      ],
      "type": "string"
    }
  },
  "additionalProperties": false
}
event_study annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}
check_stocks — Check stocks
Advertised by the server during the last successful anonymous check.
Advertised read-only

Trend and business scores (1-100) for up to 20 US or Hong Kong stocks, the industry ranks behind them, whether each is stretched above its average, and whether the scores have predicted later returns. Accepts tickers (NVDA), HK codes (700) or company names, comma-separated.

check_stocks input schema
{
  "type": "object",
  "required": [
    "symbols"
  ],
  "properties": {
    "symbols": {
      "type": "string",
      "maxLength": 300
    }
  },
  "additionalProperties": false
}
check_stocks annotations
{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
199 ms
95th percentile latency
199 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 199 ms · metadata changed · 3 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http plainquant-mcp https://plainquant.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add plainquant-mcp --url https://plainquant.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable plainquant-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "plainquant-mcp": {
      "url": "https://plainquant.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "plainquant-mcp": {
      "type": "streamableHttp",
      "url": "https://plainquant.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start plainquant-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "plainquant-mcp": {
      "type": "http",
      "url": "https://plainquant.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http plainquant-mcp https://plainquant.com/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://plainquant.com/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "plainquant-mcp": {
      "serverUrl": "https://plainquant.com/mcp"
    }
  }
}

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