← The evidence ledger
Evidence row 2202011
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://css-design-calc.x402tookit.com/vertical-rhythm
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- e68631bddee75617ecae4d948d5cab438a703eef5848a54dbc96b15c46d5a096
- Leaf
- 0xd432ae2ff186c5d4e005fa055c3714b4d7b1f40fdcfb3162c9126759ebfe3b20
What was observed
{
"endpoints": [
[
"x402",
"https://css-design-calc.x402tookit.com/vertical-rhythm"
]
],
"name": "CSS Design Calc",
"owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
"raw": {
"accepts": [
{
"amount": "20000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"transactionVersions": [
0
]
},
"maxTimeoutSeconds": 300,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:137",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
},
{
"amount": "20000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:42161",
"payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
"scheme": "exact"
}
],
"description": "Snap line-heights for font sizes to a baseline grid: baseline unit, lines per element, unitless line-height and margins.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"baseFontPx": 16,
"baseLineHeight": 1.5,
"sizes": "12,16,20,24,32,48"
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:32:45.478Z",
"baseFontPx": 16,
"baseLineHeight": 1.5,
"baselinePx": 24,
"css": ":root { --baseline: 24px; } p { margin-block: 0 var(--baseline); }",
"degraded": false,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"minLineHeight": 1.2,
"notChecked": [
"font metrics: the visual baseline can sit off the grid for fonts with unusual ascent or descent",
"WCAG 1.4.12 text-spacing overrides, which users can apply on top of your values",
"…1 more"
],
"reasons": [
"Each size gets the fewest baseline units that keep its line-height at least 1.2 times the font size.",
"Use margins in whole baseline units to keep text on the grid."
],
"rows": [
{
"baselineLines": 1,
"fontSizePx": 12,
"lineHeightPx": 24,
"lineHeightUnitless": 2,
"marginBottomPx": 24,
"rem": 0.75
},
{
"baselineLines": 1,
"fontSizePx": 16,
"lineHeightPx": 24,
"lineHeightUnitless": 1.5,
"marginBottomPx": 24,
"rem": 1
}
],
"source": "Baseline-grid arithmetic (line-height = a whole number of baseline units), computed locally",
"summary": "Baseline unit 24px (16px x 1.5); 6 sizes snapped to whole multiples.",
"verdict": "COMPUTED"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
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"description": "Body font size in px",
"type": "number"
},
"baseLineHeight": {
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"type": "number"
},
"minLineHeight": {
"description": "Smallest allowed line-height multiple for any size (default 1.2)",
"type": "number"
},
"sizes": {
"description": "Comma separated font sizes in px to snap (default 12,14,16,20,24,32,40,48,64)",
"type": "string"
}
},
"required": [
"baseFontPx"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
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"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
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"null",
"string"
]
},
"baseFontPx": {
"type": [
"null",
"number"
]
},
"baseLineHeight": {
"type": [
"null",
"number"
]
},
"baselinePx": {
"type": [
"null",
"number"
]
},
"css": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"minLineHeight": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
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},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"rows": {
"items": {
"properties": {
"baselineLines": {
"type": [
"null",
"number"
]
},
"fontSizePx": {
"type": [
"null",
"number"
]
},
"lineHeightPx": {
"type": [
"null",
"number"
]
},
"lineHeightUnitless": {
"type": [
"null",
"number"
]
},
"marginBottomPx": {
"type": [
"null",
"number"
]
},
"rem": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"source": {
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"string"
]
},
"summary": {
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"string"
]
},
"verdict": {
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}
},
"type": "object"
},
"type": {
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}
},
"required": [
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],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:47:01.065Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:47:00.85Z"
},
"resource": "https://css-design-calc.x402tookit.com/vertical-rhythm",
"serviceName": "CSS Design Calc",
"tags": [
"css",
"typography",
"vertical-rhythm",
"baseline-grid"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Snap line-heights for font sizes to a baseline grid: baseline unit, lines per element, unitless line-height and margins."
}What the leaf hashes
{"body":"e68631bddee75617ecae4d948d5cab438a703eef5848a54dbc96b15c46d5a096","id":2202011,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646811343389,"prev":null,"subject":"x402_bazaar:https://css-design-calc.x402tookit.com/vertical-rhythm","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
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- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af