curl --request POST \
  --url https://api.iotools.cloud/v1/tool/wcag-contrast-checker \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "foreground": "#000",
  "background": "#FFFFFF"
}
'

{
  "tool": "wcag-contrast-checker",
  "tool_version": "1.0.1",
  "outputs": {
    "summary": "21.00:1 — Passes WCAG AA for normal text",
    "contrastTable": [
      {
        "metric": "Contrast Ratio",
        "value": "21.00:1"
      },
      {
        "metric": "WCAG AA — Normal Text (≥ 4.5:1)",
        "value": "Pass"
      },
      {
        "metric": "WCAG AA — Large Text (≥ 3:1)",
        "value": "Pass"
      },
      {
        "metric": "WCAG AAA — Normal Text (≥ 7:1)",
        "value": "Pass"
      },
      {
        "metric": "WCAG AAA — Large Text (≥ 4.5:1)",
        "value": "Pass"
      },
      {
        "metric": "Foreground (parsed)",
        "value": "#000000"
      },
      {
        "metric": "Background (parsed)",
        "value": "#FFFFFF"
      },
      {
        "metric": "Foreground Relative Luminance",
        "value": "0.00000"
      },
      {
        "metric": "Background Relative Luminance",
        "value": "1.00000"
      }
    ]
  },
  "credits_used": 3,
  "credits_remaining": null
}