Bitcoin (BTC) API Documentation

Bitcoin

Bitcoin (BTC) is a peer-to-peer payments and settlement network secured by SHA-256 proof of work, with each block header committing to transactions through a Merkle root. Transactions use Bitcoin Script and consume unspent transaction outputs rather than modifying account balances, while full nodes validate blocks and transactions and maintain the current UTXO set. This UTXO-and-script model became the architectural baseline for several Bitcoin-derived networks, so block, transaction, output, and mempool data remain the core primitives exposed to applications.

Bitcoin API Methods and Endpoints

NOWNodes exposes Bitcoin's interface, plus a few others, depending on what your integration needs: JSON-RPC for reading chain state and broadcasting transactions, WSS (WebSocket) for real-time subscriptions and events, and Blockbook for indexed address, balance, transaction, and block lookups. Archive mode extends any of these to historical states and data beyond standard retention.

Browse the interfaces below for endpoint details, request parameters, response formats, and integration examples. Create an API key, select Mainnet or Testnet, choose the required interface, and start sending requests from your application.

Weighing Bitcoin RPC providers against each other? Read the comparison guide on our blog — this page stays focused on integration reference.