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CSS Design Calc – Vertical Rhythm / Baseline Grid Snapper
x402
CSS Design Calc – Vertical Rhythm / Baseline Grid Snapper is a paid API for AI agents from css-design-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Snaps multiple font sizes to a baseline grid, returning unitless line-heights, baseline lines, and margins for each size in both px and rem.
Price / call$0.02
Success—
StatusUnknown
How this service works
Snap line-heights for font sizes to a baseline grid: baseline unit, lines per element, unitless line-height and margins.
Output
Returns a table of rows — one per font size — each with fontSizePx, rem, baselineLines, lineHeightPx, lineHeightUnitless, and marginBottomPx. Also includes the computed baselinePx, a summary, a ready-to-copy CSS block, and optionally reasons or warnings if any size could not be snapped cleanly.
Example use cases
Design system vertical rhythm setup
“I'm building a design system with a 16px base font and 1.5 line-height. Can you snap the sizes 12, 14, 16, 20, 24, 32, 40, and 48px to a baseline grid and give me the unitless line-height and margin-bottom in px for each one?”
Custom type scale baseline alignment
“I have a base font of 18px and a line-height of 1.4. Snap font sizes 18, 22, 28, 36, and 60px to my baseline grid — I want the baseline lines, line-height px, and a ready-to-use CSS snippet.”
Enforce minimum readable line-heights
“Snap my heading sizes 24, 32, 48, and 64px to a 16px baseline grid with line-height 1.5, but make sure no size ever gets a line-height smaller than 1.3 — show me the rem values and margin-bottoms too.”
Technical details
Endpoint
GEThttps://css-design-calc.x402tookit.com/vertical-rhythm?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to align a set of font sizes to a consistent vertical baseline grid — especially when building or auditing a CSS design system or component library. It is purpose-built for snapping multiple sizes simultaneously to a shared baseline, returning both the calculated CSS values and a ready-to-use CSS snippet. Prefer it over manual calculation or generic typography tools when you need precise unitless line-heights and baseline-consistent margins in one call.
Side effects
- Missing required baseFontPx parameter returns an error
- Non-numeric or zero baseFontPx may cause division errors or unexpected output
- Extremely large font sizes or very small baselines may produce degenerate line counts
- minLineHeight greater than the computed optimal may cause overrides and warnings in reasons array
- Malformed comma-separated sizes string may be ignored or produce partial results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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