CSS and layout maths for agents: unit conversion, fluid clamp(), type scales, aspect ratios, grids, specificity and readability.
payments ON MAINNET (real money) · 12 live endpoints
| Endpoint | Price | What it answers |
|---|---|---|
GET /aspect-ratio | $0.02 | Aspect ratio of a width and height (simplified, nearest common ratio) or the missing side for a ratio, with CSS values. |
GET /box-size | $0.02 | CSS box model sizes: content, padding, border and margin boxes from a width and height under content-box or border-box. |
GET /clamp-fluid | $0.02 | Generate a CSS clamp() that scales a size linearly between a min and max viewport width, in rem, with the exact slope. |
GET /css-specificity | $0.02 | CSS selector specificity (ids, classes, types) per Selectors Level 4, including :is(), :not(), :where() and :has(); compare two. |
GET /css-unit-convert | $0.02 | Convert a CSS length between px, rem, em, pt, pc, in, cm, mm, Q, vw, vh, vmin, vmax and % with your root and viewport sizes. |
GET /golden-ratio | $0.02 | Split a length into major and minor parts by the golden ratio (or silver, root-2, custom) with matching rectangle sizes. |
GET /grid-columns | $0.02 | Column and span widths for an N-column grid from container width, columns and gutter, or the container for a column width. |
GET /line-length | $0.02 | Estimate characters per line from column width and font size and rate it for readability (45-75 ideal, WCAG max 80). |
GET /pixel-density | $0.02 | Screen pixel density (PPI) from resolution and diagonal, physical size, CSS viewport at a device pixel ratio, and image widths. |
GET /target-size | $0.02 | Check a click or touch target against WCAG 2.2 target size (24 px AA, 44 px AAA) including the spacing exception. |
GET /type-scale | $0.02 | Modular type scale: sizes in px and rem for steps below and above a base size, by named ratio (major third, golden) or number. |
GET /vertical-rhythm | $0.02 | Snap line-heights for font sizes to a baseline grid: baseline unit, lines per element, unitless line-height and margins. |
GET /catalog returns this list as JSON. Activity hub · uptime.
Results are computed locally from published formulas and the CSS and WCAG specifications, provided as is, with no warranty. Rendering depends on browsers, fonts and user settings; accessibility checks cover the stated criteria only and are not a conformance audit. Every paid response carries a disclaimer field.