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AgentsToolsHub WCAG Contrast Ratio Checker
x402
AgentsToolsHub WCAG Contrast Ratio Checker is a paid API for AI agents from agentstoolshub.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-23).
Computes the WCAG 2.1 contrast ratio between a foreground text color and background color, returning pass/fail results for AA and AAA accessibility thresholds for normal text, large text, and UI components.
Price / call$0.01
Success—
StatusUnknown
How this service works
Compute the WCAG 2.1 contrast ratio between a text and background color with pass/fail against every accessibility threshold: AA and AAA for normal and large text, plus the 3:1 UI-component minimum. Exact luminance math — the check every design system needs. Use this when an agent needs to contrast ratio + AA/AAA pass/fail.
Output
Returns the computed WCAG 2.1 contrast ratio as a numeric value, relative luminance for both foreground and background colors, and individual pass/fail results for AA normal text (4.5:1), AA large text (3:1), AAA normal text (7:1), AAA large text (4.5:1), and the 3:1 UI component minimum threshold.
Example use cases
Design system accessibility audit
“I'm building a component library and need to know if my primary button — light gray text (#F5F5F5) on a medium blue (#2563EB) — meets WCAG AA and AAA contrast standards for normal text, large text, and UI components.”
Color palette accessibility review
“We're finalizing our brand colors and I need to check if our dark green (#1A5C2A) on a white background (#FFFFFF) passes WCAG 2.1 contrast thresholds at both the AA and AAA levels.”
Catch failing colors before launch
“Before we ship, can you run a contrast check on our footer text color #757575 against the background #F0F0F0 and tell me exactly which WCAG 2.1 levels it passes or fails?”
Technical details
Endpoint
GEThttps://agentstoolshub.com/api/v1/media/contrast-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need exact WCAG 2.1 luminance-based contrast math with granular AA/AAA pass/fail results for all text sizes and UI component thresholds — ideal for design system validation, automated accessibility audits, or pre-ship color checks where precise compliance verdicts are required rather than approximate visual assessments.
Side effects
- Invalid or unparseable color format provided (e.g. unsupported color string) returns an error
- Missing required foreground or background query parameter returns a 400 bad request
- Malformed hex codes or unsupported color spaces may result in computation errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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