← The evidence ledger
Evidence row 126116
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://x402.forgemesh.io/vehicle-fuel-economy
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 1f1423de3f0df90ae5857b478b7d6d237591a22a439543d52a687afa85183cf4
- Leaf
- 0x0ffedc33d670e8caf6746c65b81e51b4163a1979bc153f6b5d106f758db3a78b
What was observed
{
"endpoints": [
[
"x402",
"https://x402.forgemesh.io/vehicle-fuel-economy"
]
],
"name": "x402.forgemesh.io/vehicle-fuel-economy",
"owner_address": "0x850363a27f0ac6feb9c7a3ec4c1d295262df9432",
"raw": {
"accepts": [
{
"amount": "5000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0x850363a27F0aC6fEb9C7a3eC4C1d295262dF9432",
"scheme": "exact"
}
],
"description": "Official fuel-economy lookup for US light-duty vehicles back to 1984: city, highway, and combined MPG, fuel type, estimated annual fuel cost, tailpipe CO2 grams per mile, and greenhouse-gas score — by year/make/model, VIN, or exact variant id. Sibling engine/transmission variants are listed so agents can price the exact configuration. For cost-of-ownership, shopping, and fleet agents. Response includes affiliate offers for full VIN history reports.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"make": "Honda",
"model": "Accord",
"model_year": "2020"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"attribution": "US DOE/EPA fuel economy database (public domain)",
"fuel_economy": {
"annual_fuel_cost_usd": 1600,
"city_mpg": 26,
"co2_tailpipe_g_per_mi": 302,
"combined_mpg": 29,
"fuel_type": "Regular",
"highway_mpg": 35
},
"matched_variant": {
"description": "2020 Honda Accord — Man 6-spd 1.5L",
"vehicle_id": 42069
},
"offers": {
"disclosure": "Affiliate links: they fund the free data; the price is the same for you.",
"history_reports": [
{
"adds": "title brands, accidents, odometer readings, prior sales",
"label": "EpicVIN vehicle history report",
"partner": "epicvin",
"pricing": "per report",
"url": "https://forgemesh.io/go/epicvin"
},
{
"adds": "title brands, accident and damage records, odometer readings, prior sales",
"label": "Detailed Vehicle History report (10% off)",
"partner": "dvh",
"pricing": "per report, coupon applied",
"url": "https://forgemesh.io/go/dvh"
}
],
"note": "Our data above is free public NHTSA/EPA data for the model year. Whether THIS VIN was wrecked, flooded, rolled back or branded salvage lives in licensed title databases; these partners sell that per VIN."
}
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"make": {
"description": "e.g. Honda",
"type": "string"
},
"model": {
"description": "e.g. Accord",
"type": "string"
},
"model_year": {
"description": "4-digit year, 1984+",
"type": "string"
},
"vehicle_id": {
"description": "exact variant id from other_variants",
"type": "integer"
},
"vin": {
"description": "VIN — decoded automatically (alternative to make/model/model_year)",
"type": "string"
}
},
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
},
"info": {
"required": false
},
"offer-receipt": {
"info": {
"offers": [
{
"acceptIndex": 0,
"format": "eip712",
"payload": {
"amount": "5000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"network": "eip155:8453",
"payTo": "0x850363a27F0aC6fEb9C7a3eC4C1d295262dF9432",
"resourceUrl": "https://x402.forgemesh.io/vehicle-fuel-economy",
"scheme": "exact",
"validUntil": 1790849079,
"version": 1
},
"signature": "0x4378d9cba35f8ed2a543ba74dc3f0bf8d851d5ea5fb2cd81d5d0c445ef69016a28fc14cddcd46d5d9d91b7ce20ffd318d2d02bc5e0fa2f42bc18238bddcb213a1b"
}
]
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"offers": {
"items": {
"properties": {
"acceptIndex": {
"type": "integer"
},
"format": {
"type": "string"
},
"payload": {
"properties": {
"amount": {
"type": "string"
},
"asset": {
"type": "string"
},
"network": {
"type": "string"
},
"payTo": {
"type": "string"
},
"resourceUrl": {
"type": "string"
},
"scheme": {
"type": "string"
},
"validUntil": {
"type": "integer"
},
"version": {
"type": "integer"
}
},
"required": [
"version",
"resourceUrl",
"scheme",
"network",
"asset",
"payTo",
"amount"
],
"type": "object"
},
"signature": {
"type": "string"
}
},
"required": [
"format",
"signature"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"offers"
],
"type": "object"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"id": {
"maxLength": 128,
"minLength": 16,
"pattern": "^[a-zA-Z0-9_-]+$",
"type": "string"
},
"required": {
"type": "boolean"
}
},
"required": [
"required"
],
"type": "object"
}
},
"lastUpdated": "2026-10-01T09:59:39.296Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-10-01T09:59:39.121Z"
},
"resource": "https://x402.forgemesh.io/vehicle-fuel-economy",
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Official fuel-economy lookup for US light-duty vehicles back to 1984: city, highway, and combined MPG, fuel type, estimated annual fuel cost, tailpipe CO2 grams per mile, and greenhouse-gas score — by year/make/model, VIN, or exact variant id. Sibling engine/transmission variants are listed so agents can price the exact configuration. For cost-of-ownership, shopping, and fleet agents. Response includes affiliate offers for full VIN history reports."
}What the leaf hashes
{"body":"1f1423de3f0df90ae5857b478b7d6d237591a22a439543d52a687afa85183cf4","id":126116,"kind":"listing","method":"baseline/1","observed_us":1793025627247137,"prev":null,"subject":"x402_bazaar:https://x402.forgemesh.io/vehicle-fuel-economy","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
- 0x0fff061f39d261ef9a343f871ba02fdadd382031306f32d7950b887a12a5fa50
- 0x23ad419a016aa240d11e17cab6d608279b33a90977f5cf407718d9518255baf9
- 0x66a5dc303cbc31f3866d23cd04be759cb8f395159e2908593f585450538aec51
- 0xaf36c263333a421756c27bfc0238b2475f2c671a6b4d0405923c03fbd5dbc5c9
- 0x8818f7d4d374c0ceee1c22d895f8fb0e6c59a8e636f376842107006ca7e07dc2
- 0xa7ba20719ddd15d788989e6d2580be3dc715d163ccf0598824b0012780800880
- 0xa389215a96c63d0ed6d78396b93585f2f887e5454cdf330390cd54f791b6de69
- 0xee819d3454a3a03d7c97016073e3b5be975e93162a3367a9af2d13e7ea3bf0ef
- 0x408b4b0d88b50e53b862ace299a0857608e658ebbbe49159e1bfa41d695e3552
- 0xaa43465b4a572fffa8395a77131320726863b79220ee24a33f803988e66ef177
- 0xb8387431db70826417a9bc1c445139bee1e0c5d359e4f9e2d85832f49bafe68b
- 0x129649b2ec48fbc611fb055c3f5627bda42692beb65d09e853d75bcda4e06239
- 0x294f7935f78a896b5f246a7c9a7ee1b023720acdb03fff3cd549c63479848ec9
- 0xb49e8c2564256e5322e375cb619d9ac70fd17c1d1eba9c991bba4cb6428f45cc
- 0x60582ab4b41e72eb70eb0bce07fbf0fb4d2b62a8bad5be50f5d16d511adc746c
- 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
- 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
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- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae