Tool detail

Color Convert + Contrast

Converts a CSS color between hex/rgb/hsl, computes relative luminance and WCAG contrast ratio against a background, and can lighten, darken or mix colors.

Categories: Utilities, Website analysis

Use when

convert a color between hex, rgb() and hsl()
check WCAG AA/AAA contrast between a color and a background
lighten, darken or mix a color for a UI theme

Not for

not a full palette generator -- single color operations per call

Inputs

POST JSON body: { color: string (required) }; background, mix (strings), darken, lighten, weight (numbers, default 0.5) all optional.

Admitted input schema

{
  "type": "object",
  "properties": {
    "background": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Optional second color for a WCAG contrast check."
    },
    "color": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "A color: \"#3498db\", \"rgb(52,152,219)\", or \"hsl(204,70%,53%)\"."
    },
    "darken": {
      "type": "number",
      "minimum": -9007199254740991,
      "maximum": 9007199254740991,
      "description": "Decrease lightness by this many percent (0-100)."
    },
    "lighten": {
      "type": "number",
      "minimum": -9007199254740991,
      "maximum": 9007199254740991,
      "description": "Increase lightness by this many percent (0-100)."
    },
    "mix": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "Blend the color toward this one."
    },
    "weight": {
      "type": "number",
      "minimum": 0,
      "maximum": 1,
      "description": "Mix weight toward \"mix\".",
      "default": 0.5
    }
  },
  "required": [
    "color"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://keyronne.com/api/color

Payment

Protocol: x402
Listed price: 0.001 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://keyronne.com/api/color
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z