Blockchain
Bitcoin Payment, Wallet & Transaction Data.
About Blockchain
Blockchain.com provides a set of free APIs for building bitcoin and blockchain applications. The Data API returns JSON for blocks and transactions, covering nearly all data available through the Blockchain Explorer, while a Simple Query API offers plain-text access to values like hashrate, difficulty, and block height.
A WebSockets channel streams low-latency updates on new blocks, transactions, and addresses, delivering JSON objects when events occur. Additional endpoints supply market data, including bitcoin exchange rates and JSON feeds of chart and statistics data. A separate Pay Partner API handles authentication, eligibility, and quotes for payment integrations, with documented rate limits.
These APIs are intended for developers building applications that read blockchain data, track market prices, or integrate bitcoin payments.
Key features
- Query blocks and transactions as JSON via the Blockchain Data API
- Simple plain-text API for hashrate, difficulty, block height, and more
- Low-latency WebSocket streaming for new blocks, transactions, and address notifications
- Bitcoin exchange rate data from major exchanges
- JSON feed of charts and statistics data
- Pay Partner API for authentication, eligibility, and quotes
Frequently asked questions
Is the API free to use?
Yes, Blockchain.com states you can build bitcoin apps on top of its APIs for free.
What kind of data can I query?
You can query blocks, transactions, hashrate, difficulty, block height, exchange rates, and chart/statistics data.
Can I get real-time updates?
Yes, a WebSocket channel provides low-latency streaming notifications for new blocks, transactions, and addresses.
What format is the data returned in?
Most data is available in JSON format, with a simple plain-text option also available for basic blockchain queries.
Who is this API for?
It is aimed at developers building bitcoin applications who need blockchain, market, and statistics data.
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