nephyr-backtest

Strategy backtesting with real on-chain Polymarket data.

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What it can do

  • Run Weather Backtest: Run a weather signal backtest over a historical date range. Uses GFS ensemble forecasts vs Polymarket prices. Returns summary stats: win rate, P&L, Sharpe, monthly breakdown.
  • Run Copy Backtest: Run a copy trading backtest by replaying historical on-chain trades from top Polymarket wallets. Strategies: baseline, top3, consensus, category-filtered.
  • Get Available Data: Check what historical data is available for a city and date range. Returns counts of cached forecast, observed, and Polymarket price days.

What data it sees

Do you need an account

No: the server works without sign-in

Strategy backtesting with real on-chain Polymarket data. Backtest weather-based prediction market strategies, simulate copy-trading top wallets, and query available historical data. Validate your strategies against real market outcomes before risking capital.

How to connect

How to connect nephyr-backtest to Claude

The server address to paste into Claude settings:

https://nephyr-backtest--clm-studios.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect nephyr-backtest to ChatGPT

The server address to paste into ChatGPT settings:

https://nephyr-backtest--clm-studios.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect nephyr-backtest to Cursor

The server address to paste into Cursor settings:

https://nephyr-backtest--clm-studios.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (3)

Raw names from tools/list. Only developers need these.

run_weather_backtestRun a weather signal backtest over a historical date range. Uses GFS ensemble forecasts vs Polymarket prices. Returns summary stats: win rate, P&L, Sharpe, monthly breakdown.
run_copy_backtestRun a copy trading backtest by replaying historical on-chain trades from top Polymarket wallets. Strategies: baseline, top3, consensus, category-filtered.
get_available_dataCheck what historical data is available for a city and date range. Returns counts of cached forecast, observed, and Polymarket price days.