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WCAG Color Contrast Ratio Calculator
x402
WCAG Color Contrast Ratio Calculator is a paid API for AI agents from x402-zoo.lolagent.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Calculates the contrast ratio between two HEX colors and evaluates WCAG AA and AAA accessibility thresholds for text.
Price / call$0.001
Success—
StatusUnknown
How this service works
Calculate contrast ratio between two HEX colors and evaluate WCAG AA and AAA text thresholds.
Output
Returns the computed contrast ratio (a number like 4.5:1) between the two HEX colors, along with boolean pass/fail results for WCAG AA (minimum 4.5:1 for normal text) and AAA (7:1) thresholds, enabling accessibility compliance decisions.
Example use cases
Accessibility audit for brand colors
“I'm building a website with a navy blue background (#003366) and want to use white (#FFFFFF) text — does this combination pass WCAG AA and AAA contrast requirements?”
Dark mode UI contrast check
“For my app's dark mode, I'm using #121212 as the background and #B0B0B0 for body text — can you tell me the contrast ratio and whether it meets WCAG accessibility standards?”
CTA button readability validation
“My call-to-action button uses a yellow background (#FFD700) with dark gray text (#333333) — does this pass WCAG AA contrast for normal and large text?”
Technical details
Endpoint
GEThttps://x402-zoo.lolagent.workers.dev/api/color-contrastWhen to prefer
Use this endpoint when you need a quick, deterministic WCAG contrast ratio check for two specific HEX colors, especially during UI/UX design, automated accessibility audits, or CI/CD pipelines. Prefer this over manual calculations or browser dev tools when building automated accessibility workflows.
Side effects
- Invalid or missing HEX color values return an error
- HEX colors provided without # prefix may be rejected or misinterpreted
- Non-HEX color formats (RGB, HSL, named colors) are not supported
- Missing foreground or background parameter causes a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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