Vextorium Color Contrast & Conversion API

x402

Vextorium Color Contrast & Conversion API is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-16).

Converts a color between HEX, RGB, HSL, HSV, and CMYK formats and computes WCAG 2.x contrast ratio against an optional background color, returning AA/AAA accessibility pass flags.

Price / call$0.003

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StatusUnknown

How this service works

Convert a color between HEX, RGB, HSL, HSV and CMYK and, given a background, compute the WCAG 2.x contrast ratio with AA/AAA pass flags; without background, suggests black or white text.

Output

Returns the input color fully converted to HEX, RGB, HSL, HSV, CMYK, and relative luminance. If a background color was provided, also returns the same conversion data for the background, plus a contrast object containing the ratio (e.g. 14.24) and boolean WCAG pass flags for AA normal text, AA large text, AAA normal text, AAA large text, and UI components. Without a background, suggests black or white as the optimal text color.

Example use cases

Accessibility audit for UI color pair

“Check if my foreground color #3B82F6 is accessible on a white background #FFFFFF — does it pass WCAG AA and AAA for both normal and large text?”

Convert brand color to all formats

“I have a brand color #FF6B35 — can you give me its RGB, HSL, HSV, and CMYK values along with its luminance?”

Best text color for a dark card background

“My card background is #1a1a2e — should I use black or white text to get the best contrast, and what ratio would each give?”

Technical details

Endpoint

POSThttps://api.vextorium.com/color-contraste-pago?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need both color format conversion and WCAG 2.x accessibility validation in a single call, especially for design system audits, automated accessibility checks in CI/CD pipelines, or generating print-ready CMYK values. It is ideal when you need luminance, contrast ratio, and multiple pass/fail flags (AA, AAA, large/normal text, UI components) together rather than separate tools.

Side effects

Invalid color format (not recognized HEX, RGB, or HSL) returns an error
Missing required 'color' field returns a validation error
Malformed background color 'fondo' may cause computation to skip contrast section
Payment not fulfilled results in 402 response from x402 layer

Input

Schema · Request body

Field	Type	Description
color	string	#RRGGBB, #RGB, rgb() or hsl()
fondo	string	Background color (optional)

Output

Schema · Response

{
  "type": "json",
  "example": {
    "color": {
      "hex": "#00ff66",
      "hsl": [
        144,
        100,
        50
      ],
      "hsv": [
        144,
        100,
        100
      ],
      "rgb": [
        0,
        255,
        102
      ],
      "cmyk": [
        100,
        0,
        60,
        0
      ],
      "luminancia": 0.7248
    },
    "fondo": {
      "hex": "#0d0e11",
      "hsl": [
        225,
        13,
        6
      ],
      "hsv": [
        225,
        24,
        7
      ],
      "rgb": [
        13,
        14,
        17
      ],
      "cmyk": [
        24,
        18,
        0,
        93
      ],
      "luminancia": 0.0044
    },
    "contraste": {
      "ratio": 14.24,
      "componentes_ui": true,
      "AA_texto_grande": true,
      "AA_texto_normal": true,
      "AAA_texto_grande": true,
      "AAA_texto_normal": true
    }
  }
}

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