CoinGecko
Cryptocurrency
Cryptocurrency Price, Market, and Developer/Social Data
Free crypto price, market, and social data — 10k+ coins, no key required.
Auth
No Auth
HTTPS
Yes
CORS
Yes
API URL
Common Use Cases
- •Build financial dashboards with real-time market data
- •Create currency conversion tools for e-commerce
- •Develop trading analysis and portfolio tracking apps
Integration Guide
Review the API Documentation
Visit the official CoinGecko documentation to understand available endpoints, request formats, and response structures. Familiarize yourself with the API's rate limits and usage policies before integration.
No Authentication Required
Good news — CoinGecko does not require any authentication. You can start making API requests directly without registering for an API key or setting up OAuth credentials.
Use HTTPS for Secure Requests
CoinGecko supports HTTPS, ensuring encrypted communication. Always use HTTPS endpoints in production to protect data in transit and comply with modern web security standards.
CORS Enabled — Direct Browser Access
CoinGecko has CORS enabled, meaning you can make requests directly from the browser. This is ideal for frontend-only applications built with React, Vue, or vanilla JavaScript.
Implement and Test
Write your API integration code, start with a simple test request to verify connectivity. Implement proper error handling for network failures, rate limits, and invalid responses. Monitor your API usage to stay within any limits.
Code Examples
JavaScript / Fetch API:
// JavaScript example
fetch("http://www.coingecko.com/api")
.then(response => {
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
return response.json();
})
.then(data => {
console.log("API response:", data);
})
.catch(error => {
console.error("Error fetching from CoinGecko:", error);
});Python / Requests:
# Python example
import requests
response = requests.get("http://www.coingecko.com/api")
if response.status_code == 200:
data = response.json()
print("API response:", data)
else:
print(f"Error: {response.status_code}")Frequently Asked Questions
Is CoinGecko free to use?
Do I need an API key for CoinGecko?
Can I use CoinGecko in a browser-based application?
What category does CoinGecko belong to?
Is CoinGecko secure?
Editor's Notes & Deep Dive
Key Features
- →GET /coins/markets?vs_currency=usd returns top coins by market cap
- →GET /coins/{id} returns full metadata: links, community stats, tickers
- →GET /simple/price?ids=bitcoin,ethereum&vs_currencies=usd is the lightest price endpoint
- →Demo API key (free) raises the limit from 30/min to 50/min
Rate Limits & Quotas
Demo tier (no key): 30 req/min, ~10k req/month. Pro tier (paid): 500 req/min with higher monthly caps.
Known Issues & Pitfalls
- !The /coins/{id}/market_chart endpoint now requires a demo key on the public host
- !Coin IDs are not the symbol — 'bitcoin' not 'BTC'; always map via /coins/list first
- !Public host can 429 under burst traffic; cache aggressively
How It Compares
The most popular free crypto API by usage. Coinpaprika has cleaner data modeling but a smaller free tier; CoinRanking requires a key for everything useful.
Sample Response
{
"bitcoin": { "usd": 67000.42 },
"ethereum": { "usd": 3521.18 }
}Pro Tips
- ✓Always pass vs_currencies as an array: vs_currencies=usd,eur,gbp
- ✓Use the demo API key (free signup) to dodge the 30/min ceiling