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Anonymous calls work against api.blockread.io. Copy a curl, then register when you need more than 1,000 calls/day.

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Network info

curl -s https://api.blockread.io/btc/network/info

Address UTXOs

curl -s https://api.blockread.io/btc/address/1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa/unspent

Socket.IO

const { io } = require('socket.io-client')
const socket = io('https://btc.blockread.io/global', { transports: ['websocket'] })
socket.on('connect', () => socket.emit('subscribe', 'address-1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa'))
socket.on('address-1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa', console.log)