← The evidence ledger
Evidence row 2202012
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://css-design-calc.x402tookit.com/type-scale
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- e122cce586fb83ad19605c85273d12fbd430104b37f4d271f481e1101c26b0d1
- Leaf
- 0x35dc87c881b0d78b0d01c2d6e3060b532ef60b9eb42414b32a128b6a9de46509
What was observed
{
"endpoints": [
[
"x402",
"https://css-design-calc.x402tookit.com/type-scale"
]
],
"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": "Modular type scale: sizes in px and rem for steps below and above a base size, by named ratio (major third, golden) or number.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"base": 16,
"down": 2,
"ratio": "major-third",
"up": 5
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:32:45.228Z",
"base": 16,
"customProperties": "--step-5: 3.0518rem; --step-4: 2.4414rem; --step-3: 1.9531rem; --step-2: 1.5625rem; --step-1: 1.25rem; --step-0: 1rem; --step-n1: 0.8rem; --step-n2: 0.64rem;",
"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.",
"notChecked": [
"rounding to whole pixels (sizes are exact; browsers may round text rendering)",
"whether a step is legible on screens or readable at your line length",
"…1 more"
],
"ratio": 1.25,
"ratioName": "major-third",
"reasons": [
"Each step multiplies by 1.25; step 0 is the base 16px.",
"Steps are exact; round for production if needed."
],
"rootPx": 16,
"source": "Modular scale: size(n) = base x ratio^n (Tim Brown); ratios are the musical-interval values used by common scale tools, computed locally",
"steps": [
{
"css": "3.0518rem",
"px": 48.8281,
"rem": 3.05176,
"step": 5
},
{
"css": "2.4414rem",
"px": 39.0625,
"rem": 2.44141,
"step": 4
}
],
"stepsAbove": 5,
"stepsBelow": 2,
"summary": "8 steps from 10.24px to 48.8281px at ratio 1.25 (major-third) from a 16px base.",
"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": {
"base": {
"description": "Base font size in px (step 0), for example 16",
"type": "number"
},
"down": {
"description": "Steps below the base, 0 to 6 (default 2)",
"type": "integer"
},
"ratio": {
"description": "Ratio name (minor-second, major-second, minor-third, major-third, perfect-fourth, augmented-fourth, perfect-fifth, minor-sixth, golden, major-sixth, minor-seventh, major-seventh, octave) or a number above 1 (default major-third = 1.25)",
"type": "string"
},
"rootPx": {
"description": "Root font size in px for rem output (default 16)",
"type": "number"
},
"up": {
"description": "Steps above the base, 0 to 12 (default 6)",
"type": "integer"
}
},
"required": [
"base"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"base": {
"type": [
"null",
"number"
]
},
"customProperties": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"ratio": {
"type": [
"null",
"number"
]
},
"ratioName": {
"type": [
"null",
"string"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"rootPx": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"steps": {
"items": {
"properties": {
"css": {
"type": [
"null",
"string"
]
},
"px": {
"type": [
"null",
"number"
]
},
"rem": {
"type": [
"null",
"number"
]
},
"step": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"stepsAbove": {
"type": [
"null",
"number"
]
},
"stepsBelow": {
"type": [
"null",
"number"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:46:58.413Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:46:58.228Z"
},
"resource": "https://css-design-calc.x402tookit.com/type-scale",
"serviceName": "CSS Design Calc",
"tags": [
"css",
"typography",
"type-scale",
"design"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Modular type scale: sizes in px and rem for steps below and above a base size, by named ratio (major third, golden) or number."
}What the leaf hashes
{"body":"e122cce586fb83ad19605c85273d12fbd430104b37f4d271f481e1101c26b0d1","id":2202012,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646811346752,"prev":null,"subject":"x402_bazaar:https://css-design-calc.x402tookit.com/type-scale","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).
- 0x35dc590fd675b256d3ebdf64358b244b8707b1e59cc9f7ce225a6ea96a33c920
- 0xe9a95acbd2a6acc3185de47db550d177a1befdf9e92a23b57e97110a704d3a4a
- 0x952445fc0a947bfba5afa7a99674e399405e29c8783135d930ad521c59a2bf0d
- 0x94901dc20a85708fc0895b2810f120d5b859173ae720dba08a0854566eae61de
- 0x059ae9467474cf3f438b33dacd44e24caf16b18480865ec1191077cc015c6f55
- 0xdc63d72e66d73f36071e4883b6bed7e9c014a0de92071f00fcb0a7fb29d382fd
- 0xc7d3e3d62a4b9ea627b8990c65767e4dbc011765cfe81a25ddc76488cc66805f
- 0x7d3d635cec258628567a32505f3f62b2c6f5d03a617cf7f9acff55d4a2f39b75
- 0xcfc7541b62c07a8b53cb95c1fa9c24fc6ff22569b92b8300bd9cd26d6af08508
- 0xd3008631ea6ea083bb008c175c96acc282a26947f302e7bfdf92772ca3e683f3
- 0x68aa051b5ad0958c2784980bb158b5c734a537988dd1b8fe9dfc6862edc59f2d
- 0xac5d22c21d3460b12d50113c8291cbbbccadc2854415c2ad7fea9abe7f6a56be
- 0xaabc34550f079fe0032f13b18945f4683cbb63c607e45516706e1dd02ac20d7f
- 0xeda95b8bf6c7d0b27dc5b32d6a6006255f41e0f6bbe80842a49daa792f4de811
- 0x464ce6fe060d0a6c4e810b71501e55084086148f7daf393caa14462b1a777022
- 0xd42916b5c6441e9c8d91ff91715af1489cb83dee26d47e7da107caa4d2a68b65
- 0xa20b9be86af7d690e040c9060a373b2fc5498edf3432f43c26f74fa2febc1e9a
- 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
- 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af