Polygon.io

API Details

Quick Start

Copy this JavaScript snippet to start using the API immediately.

const res = await fetch("https://polygon.io/docs", {
  headers: { "Authorization": "Bearer YOUR_API_KEY" }
});
const data = await res.json();
console.log(data);

Access This API

View endpoints, request formats, rate limits, and full response schemas in the official docs.

Authentication Guide

Register on the provider site to get a free key, then pass it in your request:

Authorization: Bearer YOUR_KEY
// or as query param:
?api_key=YOUR_KEY

Compatibility

Developer Tips

• →Store keys in .env – never expose them in client-side code.
• →Direct browser fetch calls work – no proxy needed.
• →Handle rate limits with retry logic and exponential backoff.
• →Cache responses locally to minimize calls and stay on free tier.

Finance Category

Explore all free APIs in the Finance category.