← The evidence ledger
Evidence row 2201620
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://map-tiles.x402tookit.com/zoom-table
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 7ecb0e4c8500fa9e64422ee5f41069d89b9cf8743a810f8203cc173f05793030
- Leaf
- 0xfefb44ec5fa21fdcbe95c5dafb0bfe80168e40583a0b08193148c8a3ce3aaf3f
What was observed
{
"endpoints": [
[
"x402",
"https://map-tiles.x402tookit.com/zoom-table"
]
],
"name": "Map Tile Maths",
"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": "Zoom-level ladder 0 to 24: tiles per side, metres per pixel, map scale and typical use, at a chosen latitude.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"fromZoom": 0,
"latitude": 45,
"toZoom": 20
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-12T00:57:26.325Z",
"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.",
"dpi": 96,
"latitude": 45,
"levels": 21,
"notChecked": [
"the real maximum zoom of any tile source",
"retina scaling",
"…1 more"
],
"reasons": [
"Each level doubles the tiles per side and halves metres per pixel."
],
"source": "computed locally (Web Mercator ground resolution)",
"summary": "Zoom 0 to 20 at 45 degrees: from 110692.640838 down to 0.105565 m per pixel.",
"table": [
{
"metersPerPixel": 110692.640838,
"scaleDenominator": 418365887,
"tileWidthMeters": 28337316.05,
"tilesPerSide": 1,
"totalTiles": 1,
"typicalUse": "world",
"zoom": 0
},
{
"metersPerPixel": 55346.320419,
"scaleDenominator": 209182943,
"tileWidthMeters": 14168658.03,
"tilesPerSide": 2,
"totalTiles": 4,
"typicalUse": "world",
"zoom": 1
}
],
"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": {
"dpi": {
"description": "Screen dpi for scale denominators (default 96)",
"type": "number"
},
"fromZoom": {
"description": "First level, 0 to 24 (default 0)",
"type": "integer"
},
"latitude": {
"description": "Latitude within +/-85.0511 (default 0)",
"type": "number"
},
"toZoom": {
"description": "Last level, 0 to 24 (default 24)",
"type": "integer"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"dpi": {
"type": [
"null",
"number"
]
},
"latitude": {
"type": [
"null",
"number"
]
},
"levels": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"table": {
"items": {
"properties": {
"metersPerPixel": {
"type": [
"null",
"number"
]
},
"scaleDenominator": {
"type": [
"null",
"number"
]
},
"tileWidthMeters": {
"type": [
"null",
"number"
]
},
"tilesPerSide": {
"type": [
"null",
"number"
]
},
"totalTiles": {
"type": [
"null",
"number"
]
},
"typicalUse": {
"type": [
"null",
"string"
]
},
"zoom": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T23:35:59.115Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T23:35:58.948Z"
},
"resource": "https://map-tiles.x402tookit.com/zoom-table",
"serviceName": "Map Tile Maths",
"tags": [
"zoom",
"scale",
"reference",
"tiles"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Zoom-level ladder 0 to 24: tiles per side, metres per pixel, map scale and typical use, at a chosen latitude."
}What the leaf hashes
{"body":"7ecb0e4c8500fa9e64422ee5f41069d89b9cf8743a810f8203cc173f05793030","id":2201620,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806922435,"prev":null,"subject":"x402_bazaar:https://map-tiles.x402tookit.com/zoom-table","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).
- 0xfefb7c282d67ac17046a3b281808b69c1187c72d09e1ad97b0ab860bade4c6ce
- 0x85522339f69dff3555cfaccdd6f1f0023af755e7bbd8412a3f57158b0d837883
- 0x720696edda5c2acbd6b6862649a88ab686f66e32f5fb18aa0137e07193b10293
- 0xf0626127088e3a0470c000fcdf8215e626e388c941eb2a79927afc6a7268e0d4
- 0xdb52f91ba24e7efb4872da44006391d0e2c77de18d7bea4aad5bf4bc6aadfe6a
- 0x6e19be440515be21c96b265834d120b7a84c3fff4b566a561f387563af53b9fa
- 0xcb1f8d0554f0f8e618b65062b97a6048e4e3595b516660870894d4c567e46861
- 0xa57fb27a499b564e2b02a78df263f73d2c85daa8dd663dee4480bbe426289fe5
- 0x79bd1618343ed5a309c5fe459087b742b0f4f77d693038add0976a063d4d321d
- 0x6d743535d2e8afb83e38c6f6b208fdf7744868cc9765d16c0d27963522ceb805
- 0x9688b76af0c9bb74be0f03c4bfb74ceb45b869b97c383be6fcd136445cd9055d
- 0x45415c76d2ab204a9729a2a944991420a243f07964146403ea6d43181ac1ca44
- 0x25127db2e775737b2874f6a159f7c1bf984317eea6482e94589c3ef4c5ccab32
- 0xec5d643575d83c9e07e65deeef71943b53cbf3007e7e2b9a6ef414081509b0cc
- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af