I built a stock market data API with FastAPI, here's what I learned

What I built

A REST API that gives developers access to real-time stock
quotes, historical data, technical indicators, and crypto
prices. Built with FastAPI and deployed on Railway.

Endpoints

• GET /stocks/quote/{symbol} — live price, volume, change
• GET /stocks/history/{symbol} — OHLCV going back years
• GET /stocks/indicators/{symbol} — RSI, MACD, SMA, EMA
• GET /stocks/info/{symbol} — market cap, P/E, sector
• GET /crypto/quote/{symbol} — crypto prices
• GET /market/movers — top gainers and losers
• POST /stocks/batch — multiple symbols at once

Tech stack

• FastAPI (Python)
• yfinance for data
• PostgreSQL on Railway
• Stripe for billing
• slowapi for rate limiting

Try it free

100 requests/day, no credit card required.

👉 https://thisapi-production-d755.up.railway.app

Comments

[scru]

Update - March 2026

Since posting this, the API has grown quite a bit. Here's what's new:

3 new endpoints:

• /v1/stocks/analyst/{symbol} - analyst price targets, buy/hold/sell ratings, and recent upgrades/downgrades (Pro+)
• /v1/stocks/options/{symbol} - full options chain with calls and puts for the nearest expiry (Business)
• /v1/forex/quote/{pair} - real-time exchange rates for 15 major currency pairs (Free)

Docs improvements:

• Interactive Try it panels on every endpoint - paste your key once and test live responses directly in the browser
• Your API key is remembered across visits so you don't have to re-enter it

Free tier still gets you 100 requests/day with no credit card.