Stock Market APIs: Build Your Own Stock Monitoring Platform

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Stock apps show what their designers decided matters. Build your own and you choose what to watch and when to be told. This guide covers the services people use for each part of the job.

A stock monitoring platform can be a weekend Python script or a polished dashboard. Either way it does five jobs, and every financial API you’ll come across fits one of them.

  1. Ingest data
  2. Store it
  3. Evaluate rules
  4. Send alerts
  5. Display

Data is the hard part. You can write your own alert logic and charts, but you can’t write market data, and that’s where cost and licensing get decided. So most of this guide is about getting prices in. The sections on storage, alerts and charts come later and are shorter.

Before you choose:prices and free-tier limits in this market change often, and providers get bought or renamed. The specific limits here were checked in...

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