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Register, generate your key, and start querying the Polygon PoS chain in under 5 minutes.
The Polygon Scan API key is the credential that authorizes your application to query data from the Polygon PoS blockchain. PolygonScanAPI provides a free tier that supports up to 100,000 API calls per day with a rate limit of 5 requests per second — ideal for developers building their first Polygon-powered application.
Step-by-Step: Generating Your Polygon API Key
Visit polygonscanapi.com, create a free account, and navigate to the "My API Keys" section in your dashboard. Click "Add" to generate a new key. You will receive a 34-character alphanumeric string — keep it secure and never expose it in client-side code.
Free vs. Pro API Plans
The free plan covers most development needs: GET/POST request support, up to 100K daily calls, and access to all standard endpoints including account balances, transaction history, token transfers, and contract ABI queries. Pro plans unlock higher throughput, PRO endpoints, and priority support starting at a competitive monthly rate.
- Free tier: 5 calls/sec, 100,000 calls/day, standard endpoints
- Standard: 10 calls/sec, unlimited daily calls, PRO endpoints
- Advanced: 20 calls/sec, PRO + analytics endpoints
Using Your API Key in Requests
Append &apikey=YOUR_API_KEY to any endpoint URL. For example, to check the POL balance of an address:
https://api.polygonscan.com/api?module=account&action=balance&address=0x...&tag=latest&apikey=YOUR_API_KEY
Both GET and POST HTTP methods are supported. If you exceed the rate limit, you will receive an HTTP 429 response. Implement exponential back-off in your client to handle this gracefully.
Security Best Practices
Store your API key in environment variables, never hard-code it in source files, and rotate it periodically from your dashboard. For server-side applications, restrict the key to your server IP in the dashboard settings to prevent unauthorized use.
