# BlockCypher API

Category: [Crypto](https://free-web-services.com/web-services/unit-convertors/crypto/)  
Page: https://free-web-services.com/web-services/unit-convertors/crypto/blockcypher-api.html  
Documentation: https://www.blockcypher.com/dev/bitcoin/

The BlockCypher API reads blocks, addresses and transactions on Bitcoin and other chains, and can post events to a webhook, for example to watch an address for payments. Requests are GET calls with JSON answers. Free, no key needed for read-only calls, up to 3 requests a second and 100 an hour. POST calls and webhooks need a free token.

- API key: Not needed
- Pricing: Free, no key needed for read-only calls, up to 3 requests a second and 100 an hour.
- From the browser: Yes (CORS)
- Formats: JSON
- Interface: REST, HTTP-GET, Webhooks
- Provider: blockcypher.com
- Last checked: Working on November 9th, 2026

Example request:

```sh
curl 'https://api.blockcypher.com/v1/btc/main'
```

The JavaScript works in a web page as well as in Node.js 18 or newer.