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Delx Commerce — Hex Color Luminance
x402
Delx Commerce — Hex Color Luminance is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-01).
Computes the relative luminance of a hex color code (#RRGGBB) and returns it as a float value.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object with a schema identifier ('delx/util-hex-color-luminance/v1') and a 'luminance' float representing the relative luminance of the input hex color, in the range 0 (black) to 1 (white), conforming to standard luminance calculation (e.g. WCAG 2.x).
Example use cases
WCAG contrast accessibility check
“I need to check if my text color #1a1a1a has enough contrast against a white background — can you get the luminance for #1a1a1a so I can calculate the contrast ratio?”
Dark vs. light color classification
“Is the brand color #4b0082 considered dark or light? Calculate its luminance so I can decide whether to put white or black text on top of it.”
Color palette luminance ranking
“I'm building a color palette and I need to sort my colors by brightness — start by getting the luminance for #e8f4f8.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/hex-color-luminance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap, single-call computation of relative luminance for a hex color, particularly for accessibility checks (WCAG contrast ratios), dynamic UI theming decisions, or color sorting by perceived brightness. It is a pay-per-call API requiring no signup, making it ideal for agent workflows that occasionally need color luminance without standing up a local color library.
Side effects
- Invalid or malformed hex string (e.g. missing #, wrong length) — likely returns a 4xx error or null luminance
- Hex string with alpha channel (8-digit) may not be supported
- Missing 'hex' field in request body — likely returns validation error
- Network or payment failure via x402 protocol — endpoint may return 402 Payment Required if payment is not correctly submitted
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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