← The evidence ledger
Evidence row 2202067
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://cooking-calc.x402tookit.com/coffee-brew
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 8db00833dd3ee66db95f3a53622043a7255ccb0fe8577d5dcf73ac39a2d2d8ab
- Leaf
- 0x2a38d1178013eda9c151660c58d4207ef0672c4ebdf8bc5107104226146b2309
What was observed
{
"endpoints": [
[
"x402",
"https://cooking-calc.x402tookit.com/coffee-brew"
]
],
"name": "Cooking Calculators",
"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": "Coffee grams for your water (or water for your grams) by method: drip, pour-over, press, espresso, cold brew; rough caffeine.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"method": "pour-over",
"waterMl": 500
},
"type": "http"
},
"output": {
"example": {
"approxBrewedLiquidMl": 438,
"asOf": "2026-10-11T14:26:08.478Z",
"caffeineMgEstimate": {
"high": 375,
"low": 156,
"typical": 234
},
"caffeineMgPer240Ml": 113,
"coffeeG": 31.25,
"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.",
"fdaDailyGuidanceMgHealthyAdults": 400,
"gramsPerLitre": 62.5,
"method": "pour-over",
"notChecked": [
"taste: ratios are starting points, grind size, water temperature (about 90 to 96 C), time and the bean decide extraction",
"the real caffeine in your coffee: it depends on bean species (robusta has roughly twice as much as arabica), roast, grind and brew, so the estimate is rough",
"…2 more"
],
"ratio": "1:16",
"reasons": [
"Ratio 1:16 (62.5 g per litre): common pour-over guideline.",
"The SCA Golden Cup reference is 55 g/L (1:18), plus or minus 10%; many brewers use 60 to 67 g/L for a stronger cup.",
"…1 more"
],
"source": "computed locally",
"summary": "pour-over: 31.25 g coffee to 500 mL water (1:16, 62.5 g/L). Roughly 234 mg caffeine in total (range 156 to 375).",
"verdict": "COMPUTED",
"waterMl": 500
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"coffeeG": {
"description": "Or ground coffee in grams, 1 to 2000",
"type": "number"
},
"espressoYieldRatio": {
"description": "espresso only: liquid out per gram in, 1.5 to 3 (default 2)",
"type": "number"
},
"method": {
"description": "drip, pour-over, french-press, aeropress, moka, cold-brew, cold-brew-concentrate, sca-golden-cup or espresso",
"type": "string"
},
"waterMl": {
"description": "Water in mL, 10 to 20000 (give this or coffeeG)",
"type": "number"
}
},
"required": [
"method"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"approxBrewedLiquidMl": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"caffeineMgEstimate": {
"properties": {
"high": {
"type": [
"null",
"number"
]
},
"low": {
"type": [
"null",
"number"
]
},
"typical": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"caffeineMgPer240Ml": {
"type": [
"null",
"number"
]
},
"coffeeG": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"fdaDailyGuidanceMgHealthyAdults": {
"type": [
"null",
"number"
]
},
"gramsPerLitre": {
"type": [
"null",
"number"
]
},
"method": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"ratio": {
"type": [
"null",
"string"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"waterMl": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:44:16.107Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:44:15.936Z"
},
"resource": "https://cooking-calc.x402tookit.com/coffee-brew",
"serviceName": "Cooking Calculators",
"tags": [
"coffee",
"brewing",
"caffeine",
"cooking",
"calculator"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Coffee grams for your water (or water for your grams) by method: drip, pour-over, press, espresso, cold brew; rough caffeine."
}What the leaf hashes
{"body":"8db00833dd3ee66db95f3a53622043a7255ccb0fe8577d5dcf73ac39a2d2d8ab","id":2202067,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812375043,"prev":null,"subject":"x402_bazaar:https://cooking-calc.x402tookit.com/coffee-brew","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