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Vextorium Color Contrast & Converter
x402
Vextorium Color Contrast & Converter is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-11).
Converts a color between HEX, RGB, HSL, HSV, and CMYK, and computes WCAG 2.x contrast ratio against a background with AA/AAA accessibility pass flags.
Price / call$0.003
Success—
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 full color representations of the input color (and optional background) in HEX, RGB, HSL, HSV, CMYK, and relative luminance. When a background is provided, also returns the WCAG 2.x contrast ratio and boolean pass/fail flags for: normal text AA, normal text AAA, large text AA, large text AAA, and UI components. Without a background, suggests black or white as the accessible text color.
Example use cases
Accessibility audit for a button
“I'm designing a primary button with background color #0057ff and white text (#ffffff) — does that combination pass WCAG 2.x AA and AAA contrast standards for normal and large text?”
Unknown background text color suggestion
“I have a brand color #e63946 and I'm not sure whether to put black or white text on it — which one is more accessible?”
Cross-format color conversion
“Convert the color hsl(144, 100%, 50%) into HEX, RGB, HSV, and CMYK for me.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/color-contrast?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need both color format conversion AND WCAG accessibility contrast evaluation in a single call. It is particularly valuable for UI/UX design automation, accessibility auditing pipelines, or design systems that need to validate color choices against WCAG 2.x AA and AAA standards without calling separate conversion and contrast services.
Side effects
- Invalid color format provided — returns error if color string cannot be parsed as #RRGGBB, #RGB, rgb(), or hsl()
- Missing required 'color' field — returns validation error
- Background color ('fund') in unrecognized format — may fail silently or return null contrast fields
- Network or payment failure resulting in 402 or 5xx response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"fund": {
"hex": "#0d0e11",
"hsl": [
225,
13
],
"hsv": [
225,
24
],
"rgb": [
13,
14
],
"cmyk": [
24,
18
],
"luminance": 0.0044
},
"color": {
"hex": "#00ff66",
"hsl": [
144,
100
],
"hsv": [
144,
100
],
"rgb": [
0,
255
],
"cmyk": [
100,
0
],
"luminance": 0.7248
},
"contrast": {
"ratio": 14.24,
"ui_components": true,
"grande_text_AA": true,
"normal_text_AA": true,
"grande_text_AAA": true,
"normal_text_AAA": true
}
}
}Tags
x402
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