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Cheap Utilities Color Contrast Checker
x402
Cheap Utilities Color Contrast Checker is a paid API for AI agents from cheap-utilities.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-31).
Calculates the WCAG contrast ratio between two hex colors and returns AA/AAA pass/fail verdicts for normal text, large text, and UI components.
Price / call$0.02
Success—
StatusUnknown
How this service works
WCAG contrast ratio between two hex colors with AA and AAA pass/fail for normal and large text.
Output
Returns a numeric WCAG contrast ratio (e.g. 4.5:1), boolean AA and AAA pass/fail results separately for normal text and large text, a UI components 3:1 flag, a human-readable summary verdict, reasons for the verdict, and optional degraded/disclaimer fields.
Example use cases
Accessibility audit for brand colors
“I'm building a website and want to use #333333 text on a #f5f5f5 background — can you check the contrast ratio and tell me if it passes WCAG AA and AAA for normal and large text?”
Dark mode color pair validation
“For our dark mode theme, we're using #e0e0e0 foreground on a #121212 background — does that combination meet WCAG accessibility standards, especially for small body text?”
Button text legibility check
“Our design team chose #ffffff text on a #0057b8 button — can you tell me the contrast ratio and whether it passes WCAG AA for normal text and also the 3:1 threshold for UI components?”
Technical details
Endpoint
GEThttps://cheap-utilities.x402tookit.com/color-contrast?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap, standards-compliant WCAG contrast ratio check with explicit AA and AAA verdicts for both normal and large text. Ideal for automated accessibility audits in CI pipelines, design system validation, or any agent workflow that needs to verify color choices without a browser or rendering engine.
Side effects
- Missing fg or bg query parameter returns an error
- Invalid or malformed hex color strings (e.g. non-hex characters) may return an error or null ratio
- Very short hex codes not expandable to 6 digits may fail parsing
- Network or upstream service timeout returns no data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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