← The evidence ledger
Evidence row 2201252
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://photo-calc.x402tookit.com/exposure-trade
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 4fa721e43e4d04132707137c5154407a471489aa17a71591d2dcfa55c00eafca
- Leaf
- 0xea7635473126fa744935b4edd0908153e103bde053723773fa7365660f0a2a73
What was observed
{
"endpoints": [
[
"x402",
"https://photo-calc.x402tookit.com/exposure-trade"
]
],
"name": "Photography 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": "Hold exposure constant: change one setting (aperture, shutter or ISO) and get the other two compensations, in stops.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"aperture": 5.6,
"iso": 100,
"newAperture": 11,
"shutter": "1/125"
},
"type": "http"
},
"output": {
"example": {
"after": {
"aperture": 11,
"iso": 100,
"nearestStandardAperture": 11,
"shutter": "1/32 s",
"shutterS": 0.030867347
},
"asOf": "2026-10-11T08:40:14.514Z",
"before": {
"aperture": 5.6,
"iso": 100,
"shutterS": 0.008
},
"changed": "newAperture",
"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": [
"the lens' actual aperture range and the camera's shutter limits",
"image-quality trade-offs: noise at high ISO, diffraction at small apertures, motion blur at slow shutters",
"…1 more"
],
"reasons": [
"A stop is a doubling or halving of light: shutter time x2, ISO x2, or aperture area x2 (f-number x 1.414).",
"Standard stops: f/1.4 2 2.8 4 5.6 8 11 16 22."
],
"source": "computed locally",
"stopsChanged": -1.948,
"summary": "aperture changed by -1.95 stop(s) of light; shutter compensates to 1/32 s at the same ISO: f/11, 1/32 s, ISO 100 matches f/5.6, 1/125 s, ISO 100.",
"verdict": "EQUIVALENT_EXPOSURE"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"aperture": {
"description": "Current f-number",
"type": "number"
},
"iso": {
"description": "Current ISO",
"type": "number"
},
"newAperture": {
"description": "New f-number (give exactly one new value)",
"type": "number"
},
"newIso": {
"description": "New ISO",
"type": "number"
},
"newShutter": {
"description": "New shutter",
"type": "string"
},
"shutter": {
"description": "Current shutter such as 1/125",
"type": "string"
}
},
"required": [
"aperture",
"shutter",
"iso"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"after": {
"properties": {
"aperture": {
"type": [
"null",
"number"
]
},
"iso": {
"type": [
"null",
"number"
]
},
"nearestStandardAperture": {
"type": [
"null",
"number"
]
},
"shutter": {
"type": [
"null",
"string"
]
},
"shutterS": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"before": {
"properties": {
"aperture": {
"type": [
"null",
"number"
]
},
"iso": {
"type": [
"null",
"number"
]
},
"shutterS": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"changed": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"stopsChanged": {
"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": "2026-11-02T04:07:19.168Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-11-02T04:07:19.01Z"
},
"resource": "https://photo-calc.x402tookit.com/exposure-trade",
"serviceName": "Photography Calculators",
"tags": [
"photography",
"exposure",
"stops",
"calculator"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Hold exposure constant: change one setting (aperture, shutter or ISO) and get the other two compensations, in stops."
}What the leaf hashes
{"body":"4fa721e43e4d04132707137c5154407a471489aa17a71591d2dcfa55c00eafca","id":2201252,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646803057218,"prev":null,"subject":"x402_bazaar:https://photo-calc.x402tookit.com/exposure-trade","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).
- 0xea75b82b2917c0102a175a95cc003505916dbc5bb03b19c2c7d2bf6202001283
- 0x7ae74f0fa701f4040052fb9a10c0ff694a65f1b8fccd41a59a8d75a802681825
- 0x8f7e98dfcf607dcdfe57a5b4074c8923c4f2842f3586fd6154d16e378be24c7d
- 0x337928c237a19b5530cf73b865bb8b454fdb47abf2fa9e6e4c194e8cdbe0764c
- 0x3a8946adf08d53dc3bdafa9365f838d6dfff3b7c91a14b008b7037947fd20234
- 0xa0862dec0b780042fffb834d4218619c2015eeed5d6749e70477c9ada10f1658
- 0x754ba4b558dd1a9cffa35339c4b1230b5b8bf36085c1c574b4a9649b6e888e3a
- 0xbabd507df8cbd4f16c86e8c34d07de9e0c339ab3d1e1c942f95e2b90e77739e8
- 0xa72e1812fd5b62f43fbc3d0307d7bfcddc8a3ead23966035beedf19b469a1a58
- 0x1daca82cb27b471502e9b166b7f075da5e023ac5ba652dd8f1c32c73453a2858
- 0x8612cc730626cd6eaeb2985f053b96a9a221c1762d24274367fb6c5637472b69
- 0xc179417f8ae1f11ae3d161c9b0dfda8c85fd1a0287b9cd9a92883e24030e37b5
- 0xe61415e30eff3f78f72f491cf1aa4fddf56b5fa4aab16d517b5f3bb9587740ef
- 0xf02baa2f8f9b385919b2f698b2e9351b84bd44118a8d5a72f2d1303df2c329b4
- 0xd643f764eee39146411d4bff8903a327f4f8f55616e14e57281a245206d6ed2b
- 0x6dd7e4db65395e8670c7c2747d44fec79e03305934ef4746bf5dbca04ec6ec49
- 0xec5d643575d83c9e07e65deeef71943b53cbf3007e7e2b9a6ef414081509b0cc
- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af