← The evidence ledger
Evidence row 17685
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://nbu.navistri.com/v1/rates
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 6f386141630f8647c9c9af9cf44bad46d809c971183d26901b8492c5adf10e08
- Leaf
- 0x877c9eb4695d34aca15112052b81813fbc3bd5abb809bdab3d29414309781636
What was observed
{
"endpoints": [
[
"x402",
"https://nbu.navistri.com/v1/rates"
]
],
"name": "NBU Data Ukraine",
"owner_address": "0x44e5ebeb366ab69a0a3c1c05080a01fe0d8013ef",
"raw": {
"accepts": [
{
"amount": "1000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:8453",
"payTo": "0x44e5eBeB366Ab69A0a3C1c05080a01FE0d8013ef",
"scheme": "exact"
}
],
"description": "Official National Bank of Ukraine (NBU) exchange rates of the hryvnia (UAH) on a date: 40+ currencies, gold, silver and SDR, with English names. Call it when you need the legally official UAH rate for Ukrainian accounting, tax, invoices or customs, or to convert to/from UAH on a given date. Params: date (YYYY-MM-DD, default today in Kyiv), currency (ISO code, optional; omit for all).",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"currency": "USD",
"date": "2026-10-09"
},
"type": "http"
},
"output": {
"example": {
"data": {
"base": "UAH",
"count": 1,
"date": "2026-10-09",
"rates": [
{
"currency": "USD",
"name": "US Dollar",
"nameUk": "Долар США",
"numericCode": 840,
"rate": 44.8526,
"ratePerUnit": 44.8526,
"setOn": "2026-10-08",
"specialConditions": false,
"units": 1
}
]
},
"meta": {
"cached": false,
"endpoint": "GET /v1/rates",
"params": {
"currency": "USD",
"date": "2026-10-09"
},
"retrievedAt": "2026-10-12T12:00:00.000Z",
"source": "National Bank of Ukraine open data (bank.gov.ua)",
"sourceUrl": "https://bank.gov.ua/ua/open-data/api-dev",
"terms": "Ukrainian public open data: free reuse including commercial use, with mandatory attribution to the source (Law of Ukraine 'On Access to Public Information', art. 10-1; https://bank.gov.ua/ua/open-data). Values are passed through unchanged. Not affiliated with or endorsed by the NBU.",
"upstreamUrl": "https://bank.gov.ua/..."
}
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"additionalProperties": false,
"properties": {
"currency": {
"description": "ISO 4217 code such as USD, EUR, PLN, XAU. Omit to get every published currency.",
"pattern": "^[A-Za-z]{3}$",
"type": "string"
},
"date": {
"description": "Date the rate applies to, YYYY-MM-DD, from 1996-09-02 to tomorrow (Kyiv). Default: today.",
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"base": {
"const": "UAH"
},
"count": {
"type": "number"
},
"date": {
"format": "date",
"type": "string"
},
"rates": {
"items": {
"properties": {
"currency": {
"description": "ISO 4217 alphabetic code",
"type": "string"
},
"name": {
"description": "English name",
"type": [
"string",
"null"
]
},
"nameUk": {
"description": "Ukrainian name",
"type": [
"string",
"null"
]
},
"numericCode": {
"type": [
"number",
"null"
]
},
"rate": {
"description": "UAH per `units` units of the currency",
"type": "number"
},
"ratePerUnit": {
"description": "UAH per 1 unit of the currency",
"type": "number"
},
"setOn": {
"description": "Date the NBU set the rate",
"type": [
"string",
"null"
]
},
"specialConditions": {
"description": "USD only: rate set under special conditions",
"type": [
"boolean",
"null"
]
},
"units": {
"type": "number"
}
},
"required": [
"currency",
"rate",
"units",
"ratePerUnit"
],
"type": "object"
},
"type": "array"
}
},
"required": [
"date",
"base",
"count",
"rates"
],
"type": "object"
},
"meta": {
"properties": {
"cached": {
"type": "boolean"
},
"endpoint": {
"type": "string"
},
"params": {
"type": "object"
},
"retrievedAt": {
"format": "date-time",
"type": "string"
},
"source": {
"type": "string"
},
"sourceUrl": {
"type": "string"
},
"terms": {
"type": "string"
},
"upstreamUrl": {
"type": "string"
}
},
"type": "object"
}
},
"required": [
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-26T08:41:33.315Z",
"quality": {
"l30DaysTotalCalls": 11,
"l30DaysUniquePayers": 9,
"lastCalledAt": "2026-10-26T08:41:33.203Z"
},
"resource": "https://nbu.navistri.com/v1/rates",
"serviceName": "NBU Data Ukraine",
"tags": [
"data",
"finance",
"ukraine",
"exchange-rates",
"nbu"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Official National Bank of Ukraine (NBU) exchange rates of the hryvnia (UAH) on a date: 40+ currencies, gold, silver and SDR, with English names. Call it when you need the legally official UAH rate for Ukrainian accounting, tax, invoices or customs, or to convert to/from UAH on a given date. Params: date (YYYY-MM-DD, default today in Kyiv), currency (ISO code, optional; omit for all)."
}What the leaf hashes
{"body":"6f386141630f8647c9c9af9cf44bad46d809c971183d26901b8492c5adf10e08","id":17685,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025327178906,"prev":null,"subject":"x402_bazaar:https://nbu.navistri.com/v1/rates","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).
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- 0xb4f34e56a246a606cda25588ebd1e90b964ed19a227403fa5c40e7f3b5bc8063
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- 0x2c5228bcc2151136a1b082bc407949f71fc0ab3a60e58575c4ec80240c348fbc
- 0xaf665900dda994fc87232a31e5ec02cfdd4ae4b41f6b32dc8c13b0c2b012c393
- 0xe25366af2af274496ca41787eafb2c119ce9a251db42a02a5eb1561d64ea1966
- 0xec5e8d8107df73a55b5645397c05edbd1f63c299281c6362a3438a21d64fc937
- 0xf711b9b9e4c3b8926dcd8da66413d329b6436fc26d19d8021ba003e1303e5918
- 0xe0e4a60716d95ec12c35a9b9e1bff1012120a026fa97f38064a594590f5c029f
- 0xab0c5c1fde083e427b8955a771d679773808751fc069bed2944e88e84fcb655e
- 0x099dd43573993f2a1bea674129b7ed050429a0ac76c3bfda8aaf82a3af126469
- 0x49d11be052a4c069b10250aaba214f566b3f2e5aaa7a98e82ccc6a71c0e801a0
- 0x78ac2b34737774659a6a411f4d10b8ba570d40699d9f277321c3a32ff03d1dc9
- 0x7eb603d37f0f22dae1ea013e391889906ffc0139ff26e25b044bee38eec8f9b2
- 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
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- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae