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Foundry Color Converter
x402
Foundry Color Converter is a paid API for AI agents from minty-sprout.onrender.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-11-01).
Converts a color (hex, RGB, HSL, or basic name) and returns all formats, luminance, contrast ratios against white and black, and the best readable text color overlay.
Price / call$0.001
Success—
StatusUnknown
How this service works
Color converter: hex, RGB and HSL, luminance, contrast against white and black, best text color. Input: '#1e90ff'.
Output
Returns a JSON object with the color expressed in hex, RGB, and HSL formats, its relative luminance (0–1), contrast ratio against black, contrast ratio against white, and the recommended best text color (#000000 or #ffffff) for legibility.
Example use cases
Accessibility contrast check for brand color
“I'm using #d4380d as my primary button background — what's the contrast ratio against white and black, and which text color should I use to meet accessibility standards?”
Full color format conversion for CSS
“Can you convert hsl(210, 100%, 56%) into hex and RGB so I can use it in my stylesheet?”
Choosing readable overlay text color
“I have a card with a background color of rgb(255, 200, 50) — what text color, black or white, will be most readable on top of it?”
Technical details
Endpoint
POSThttps://minty-sprout.onrender.com/v1/color-convert?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically convert colors between formats (hex/RGB/HSL), compute WCAG luminance or contrast ratios for accessibility checks, or determine the best readable text color (black vs white) to overlay on a given background color. It handles all common CSS color input formats in a single call.
Side effects
- Invalid or unparseable color input returns an error (e.g. malformed hex, out-of-range RGB values)
- Missing input field returns a validation error
- Network timeout if the Render.com host is cold-starting
- Unsupported color name not in the basic color name set may fail to parse
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | string | #hex, rgb(r,g,b), hsl(h,s%,l%) or a basic name |
Output
Schema · Response
{
"type": "json",
"example": {
"hex": "#1e90ff",
"hsl": "hsl(210, 100%, 56%)",
"rgb": "rgb(30, 144, 255)",
"luminance": 0.2744,
"best_text_color": "#000000",
"contrast_vs_black": 6.49,
"contrast_vs_white": 3.24
}
}Tags
x402
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