BTC Ticker Cloudflare Worker

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

addEventListener('scheduled', event => {
  event.waitUntil(handleCronTrigger())
})

async function handleRequest(request) {
  const data = await KV.get('info');

  return new Response(data, {
    status: 200,
    headers: {
      'Content-Type': 'application/json'
    }
  })
}

function handleCronTrigger() {
  return new Promise(async (resolved, rejected) => {
    const res = await fetch('https://api.kraken.com/0/public/Ticker?pair=BTCUSD')
    const data = await res.json()

    const ticker = data.result.XXBTZUSD

    await KV.put('info', JSON.stringify({
      // Last ask price
      ask: ticker.a[0],
      // Last bid price
      bid: ticker.b[0],
      // Last trade closed
      lastTrade: ticker.c[0],
      // Volume traded in the last 24 houurs
      volume: ticker.v[1],
      // 24 hour low
      low: ticker.l[1],
      // 24 hour high
      high: ticker.h[1],
      // Open price
      open: ticker.o
    }))

    resolved()
  })
}