Here is a color palette designed with contrasting colors that ensure black text is visible on top. The selected colors are bright and sufficiently distinct to support readability when overlaid with black text.

json
{
  "palette_name": "High Contrast Stacked Bar Colors",
  "colors": [
    {
      "name": "Bright Cyan",
      "hex_code": "
                            
                            #00BFFF
                        "
    },
    {
      "name": "Light Lime",
      "hex_code": "
                            
                            #B2FF59
                        "
    },
    {
      "name": "Vivid Orange",
      "hex_code": "
                            
                            #FF5722
                        "
    }
  ]
}

This palette features bright cyan, light lime, and vivid orange, all of which provide a high contrast against black text, ensuring good readability.

Would you like to see more options, or do you have any specific color preferences in mind?