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WCAG Color Contrast Checker
x402
WCAG Color Contrast Checker is a paid API for AI agents from x402render-u5vwpxpyua-uc.a.run.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Computes the WCAG contrast ratio between a foreground and background hex color, returning AA and AAA accessibility pass/fail flags
Price / call$0.01
Success—
StatusUnknown
How this service works
WCAG contrast ratio between two colours, with AA/AAA pass flags
Output
Returns a numeric WCAG contrast ratio (e.g. 4.5:1) along with boolean pass/fail flags for both the AA standard (minimum 4.5:1 for normal text) and AAA standard (minimum 7:1), allowing developers and designers to quickly assess whether a color pair meets accessibility requirements.
Example use cases
Accessibility audit for brand colors
“Can you check whether my brand's primary text color #1A1A2E on a white background #FFFFFF passes WCAG AA and AAA contrast requirements?”
UI component color validation
“I'm designing a button with light grey text #CCCCCC on a blue background #0057B8 — does that color combo meet WCAG AA accessibility standards?”
Dark mode palette compliance check
“In my dark mode design I have #E0E0E0 text on a #121212 background — what's the contrast ratio and does it pass both WCAG AA and AAA?”
Technical details
Endpoint
POSThttps://x402render-u5vwpxpyua-uc.a.run.app/color-contrastWhen to prefer
Choose this endpoint when you need a programmatic, standards-based WCAG contrast ratio check between two specific hex colors and want AA/AAA compliance flags returned directly. Prefer this over manual calculation tools or generic color libraries when building automated accessibility auditing pipelines, design linting tools, or CI checks for UI components.
Side effects
- Invalid or malformed hex color values (missing # prefix, wrong length) may cause a 400 error
- Missing required background or foreground fields returns an error
- Identical foreground and background colors return a contrast ratio of 1:1 and fail all standards
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| background | string | hex |
| foreground | string | hex |
Tags
x402
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