Mini Disruptor Scoring Endpoint (LangChain + Groq)

Tiny FastAPI demo that uses Groq + LangChain to score how disruptive a company is. Pulls real-time data from Yahoo Finance (yfinance) and returns clean JSON.

The API validates the stock ticker, fetches company info, and then generates a short JSON report containing:

• summary: 3-sentence disruptor explanation
• risk_score (1–5)
• opportunity_score (1–5)

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Features

• Validates real stock tickers
• Fetches live company data from Yahoo Finance
• Forces the LLM to return valid JSON (using Pydantic output parser)
• Proper error handling (400/404/500 with clear messages)

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Requirements

• Python 3.11+
• uv (faster than pip/poetry, recommended)

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Setup (2025 style)

1. Install uv if you don’t have it:

pip install uv   # or brew install uv, or curl -LsSf https://astral.sh/uv/install.sh | sh

2. Clone the repo and cd into it

3. Install dependencies

• With pyproject.toml (creates venv + installs all deps including dev):

uv sync --frozen

• With requirements.txt only:

py -m venv .venv
.venv/scripts/activate
pip install -r requirements.txt

4. Configure your .env

cp .env.example .env

Then edit .env and add your Groq key:

GROQ_API_KEY=gsk_your_key_here

Get one for free at: https://console.groq.com/keys

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How to run

uv run fastapi dev

or

fastapi dev

Swagger docs → http://127.0.0.1:8000/docs

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Endpoint

POST /score-company

Request Body

{
  "ticker": "NVDA"
}

Example Response

{
  "ticker": "NVDA",
  "summary": "NVIDIA basically prints money with AI chips and has a near monopoly on training hardware...",
  "risk_score": 2,
  "opportunity_score": 5
}

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Error Responses

• 400 → invalid ticker (numbers, too long, garbage)
• 404 → ticker doesn’t exist on Yahoo Finance
• 500 → LLM returned invalid JSON (rare with Groq + output parser)