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Delx Hex Color Luminance
x402
Delx Hex Color Luminance is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Computes the relative luminance of a hex color value (#RRGGBB) and returns a float between 0 and 1.
Price / call$0.001
Success—
StatusUnknown
How this service works
Relative luminance of a #RRGGBB color. Call when contrast checks without image decode. Returns luminance as deterministic JSON for $0.001 USDC via x402 on Base. First-party local math only—no RPC, live market feed, API keys, storage, or mediagen. Advisory only; the caller owns capital, risk, and production controls.
Output
Returns a JSON object with a schema identifier ('delx/util-hex-color-luminance/v1') and a 'luminance' field containing a float between 0 (absolute black) and 1 (absolute white) representing the relative luminance of the input hex color per WCAG standards.
Example use cases
WCAG contrast ratio check
“I'm building a UI and need to verify text contrast — can you calculate the luminance of #FFFFFF and #1C1C1E so I can compute their contrast ratio for WCAG AA compliance?”
Auto text color on dynamic backgrounds
“My app dynamically picks background colors from user avatars. Can you get the luminance of #F4C430 so I can decide whether to put black or white text on top of it?”
Accessibility audit for brand palette
“I need to audit our brand colors for accessibility — can you compute the luminance of #0057B8 so I can see if it meets the minimum contrast threshold against a white background?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/hex-color-luminanceWhen to prefer
Choose this endpoint when you need a fast, single-call luminance value for a specific hex color — especially for accessibility checks, contrast ratio computation, or deciding between light and dark foreground text. It is simpler and cheaper than full color-analysis APIs when all you need is the scalar luminance float.
Side effects
- Invalid or malformed hex string (missing #, wrong length, non-hex characters) — likely returns a 4xx error
- Missing 'hex' field in request body — likely returns a 400 validation error
- Hex shorthand (e.g. #FFF instead of #FFFFFF) may not be supported — use full 6-digit form
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hex | string | Hex color #RRGGBB |
Output
Schema · Response
{
"type": "json",
"example": {
"schema": "delx/util-hex-color-luminance/v1",
"luminance": 0.01502241942073589
}
}Tags
x402
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