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WCAG Contrast Fix — Adjust Text Color Lightness to Meet Contrast Target
x402
WCAG Contrast Fix — Adjust Text Color Lightness to Meet Contrast Target is a paid API for AI agents from color-design.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Adjusts a text color's lightness to reach a specified WCAG contrast ratio (3, 4.5, or 7) against a given background, preserving its original hue.
Price / call$0.02
Success—
StatusUnknown
How this service works
Adjust a text color's lightness just enough to reach a WCAG contrast target (4.5, 3 or 7) on a background, keeping its hue.
Output
Returns the original and corrected foreground hex, contrast ratios before and after the fix, lightness shift applied, the WCAG target used, a verdict on compliance, a human-readable summary, reasons for any adjustments, and flags for degraded or unchecked conditions.
Example use cases
Fix brand color for AA compliance
“My brand blue is #4a90d9 and I'm using it as text on a white (#ffffff) background — it's failing WCAG AA. Can you nudge its lightness until it reaches a 4.5 contrast ratio without changing the hue?”
Achieve AAA contrast for legal disclaimer
“I need my disclaimer text (#888888) on a dark background (#1c1c1c) to hit a WCAG contrast target of 7 for AAA compliance. Can you fix the text color's lightness to get there while keeping the same gray tone?”
Quick contrast check and fix for UI button
“The label color on my CTA button is #e05c5c and the button background is #ff9999 — please adjust the text color's lightness to at least meet the 3:1 contrast minimum for large text, keeping the same red hue.”
Technical details
Endpoint
GEThttps://color-design.x402tookit.com/contrast-fix?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a minimal, hue-preserving correction to a text color to meet a specific WCAG contrast threshold — not a full palette regen, color picker, or generic contrast checker. Ideal for automated accessibility remediation pipelines where brand hue must be preserved and only lightness should change.
Side effects
- Invalid hex format for foreground or background returns an error
- Contrast target not 3, 4.5, or 7 may be rejected or defaulted
- Color may already pass — fixed value equals original with contrastBefore >= target
- If no lightness adjustment can reach the target (e.g. pure hue limits), degraded flag may be set
- Missing required foreground or background parameters returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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