get_historical_fng_tool
Retrieve historical Crypto Fear & Greed Index data for analysis of market sentiment trends over a specified number of days.
Instructions
Get historical Fear & Greed Index for specified number of days as a tool.
Parameters: days (int): Number of days to retrieve (must be a positive integer).
Returns: str: Historical Fear & Greed Index values for the specified period.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| days | Yes |
Implementation Reference
- main.py:69-82 (handler)The handler function for the 'get_historical_fng_tool' MCP tool. It is registered via @mcp.tool() decorator, includes input schema in docstring and type hints, logs the request, and delegates to the core get_historical_fng helper.
@mcp.tool() async def get_historical_fng_tool(days: int, ctx: Context) -> str: """ Get historical Fear & Greed Index for specified number of days as a tool. Parameters: days (int): Number of days to retrieve (must be a positive integer). Returns: str: Historical Fear & Greed Index values for the specified period. """ ctx.info(f"Fetching historical Fear & Greed Index for {days} days") return await get_historical_fng(str(days)) - main.py:34-59 (helper)The core helper function that fetches historical Crypto Fear & Greed Index data from the API endpoint and formats the response. Called by the tool handler.
@mcp.resource("fng://history/{days}") async def get_historical_fng(days: str) -> str: """Get historical Crypto Fear & Greed Index for specified number of days""" try: days_int = int(days) if days_int <= 0: raise ValueError("Days must be a positive integer") async with httpx.AsyncClient() as client: response = await client.get(API_URL, params={"limit": days_int}) response.raise_for_status() data = response.json()["data"] result = ["Historical Crypto Fear & Greed Index:"] for entry in reversed(data): # Latest first timestamp = datetime.fromtimestamp(int(entry["timestamp"])) result.append( f"{timestamp} UTC: {entry['value']} ({entry['value_classification']})" ) return "\n".join(result) except ValueError as e: return f"Error: {str(e)}" except httpx.HTTPStatusError as e: return f"Error fetching historical FNG: {str(e)}" except Exception as e: return f"Unexpected error: {str(e)}"