Use it in

Charts in Slack.

Post an image block from a bot or a workflow and the chart shows in the channel, no attachment upload needed.

Start freeSee the examples
# opsToday

Ops bot 09:00

Jobs in the last hour. Workers failed 27.

Stacked horizontal bars: jobs in the last hour by service, Workers with the most failures at 27

Set it up.

  1. Write the URL

    Start from the Slack status example: two series, stacked, h=300 so it fits the preview.

  2. Post an image block

    Put the URL in image_url with alt text.

  3. Schedule it

    Send it from your bot every hour. Each new hour is one render.

{
  "blocks": [{
    "type": "image",
    "image_url": "https://c.renderchart.com/?key=rc_pub_live_7Hq2mX9pLk4vN8sT1wEa&type=hbar&x=API,Web,Workers,Queue&y1=982,1204,640,310&y2=12,3,27,4&n1=Succeeded&n2=Failed&stacked=1&title=Jobs%20in%20the%20last%20hour&h=300",
    "alt_text": "Slack status chart"
  }]
}

Worth knowing.

Hide the key
Short URLs (/s/) hide your key and data, on Starter and above.
Live charts
On Pro, a live short URL shows new data within about five minutes, so a pinned message stays current.
Start freeRead the URL spec