← The evidence ledger
Evidence row 73179
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://data.spencermcw.com/v1/drug/nadac/changes
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- b8a629347d32b3de956757c3eaf0e0bb97b733c49aafe6f0b5678f4166782a72
- Leaf
- 0xdccb605cfa9515b7076de07fec053309fef9fbe481ca5cd4fff3fbe8200b70d6
What was observed
{
"endpoints": [
[
"x402",
"https://data.spencermcw.com/v1/drug/nadac/changes"
]
],
"name": "data.spencermcw.com/v1/drug/nadac/changes",
"owner_address": "0xe6900ae625875b748f56fb45c3e06a59be8870df",
"raw": {
"accepts": [
{
"amount": "50000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 300,
"network": "eip155:8453",
"payTo": "0xE6900aE625875b748f56Fb45C3e06a59Be8870DF",
"scheme": "exact"
}
],
"description": "Which drug acquisition costs changed this week? NADAC per-unit cost changes and NDCs added or dropped, with CMS’s stated reason, 2025 on, from CMS’s weekly NADAC files. Updated weekly. $0.05 per call (x402, USDC on Base); 3 free calls a day.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"limit": 2,
"ndc": "00378410591"
},
"type": "http"
},
"output": {
"example": {
"data": {
"next_cursor": "31659",
"records": [
{
"as_of": "2025-01-22",
"description": "ABACAVIR 300 MG TABLET",
"detected_at": "2025-01-22T00:00:00.000Z",
"effective": "2025-01-22",
"field": "nadac_per_unit",
"id": "3291",
"method_version": "drug.nadac@1.0.0",
"ndc": "00378410591",
"new": "0.59565",
"old": "0.60042",
"reason": "Survey Rate",
"source_sha256_new": "317c0387d2005b18ade760029bf61b3ff5a3aab74ef96e322d319432c410ed80",
"source_sha256_old": "317c0387d2005b18ade760029bf61b3ff5a3aab74ef96e322d319432c410ed80"
},
{
"as_of": "2025-02-19",
"description": "ABACAVIR 300 MG TABLET",
"detected_at": "2025-02-19T00:00:00.000Z",
"effective": "2025-02-19",
"field": "nadac_per_unit",
"id": "31659",
"method_version": "drug.nadac@1.0.0",
"ndc": "00378410591",
"new": "0.60252",
"old": "0.59565",
"reason": "Survey Rate",
"source_sha256_new": "317c0387d2005b18ade760029bf61b3ff5a3aab74ef96e322d319432c410ed80",
"source_sha256_old": "317c0387d2005b18ade760029bf61b3ff5a3aab74ef96e322d319432c410ed80"
}
]
}
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"cursor": {
"pattern": "^\\d{1,12}$",
"type": "string"
},
"field": {
"enum": [
"nadac_per_unit",
"listed"
],
"type": "string"
},
"limit": {
"maximum": 100,
"minimum": 1,
"type": "integer"
},
"ndc": {
"pattern": "^(\\d{11}|\\d{4,5}-\\d{3,4}-\\d{1,2})$",
"type": "string"
},
"since": {
"format": "date-time",
"pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
"type": "string"
},
"week": {
"pattern": "^\\d{4}-\\d{2}-\\d{2}$",
"type": "string"
}
},
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
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"properties": {
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"type": [
"string",
"null"
]
},
"records": {
"items": {
"additionalProperties": false,
"properties": {
"as_of": {
"description": "The weekly file the change first appears in.",
"type": "string"
},
"description": {
"type": "string"
},
"detected_at": {
"type": "string"
},
"effective": {
"type": "string"
},
"field": {
"enum": [
"nadac_per_unit",
"listed"
],
"type": "string"
},
"id": {
"type": "string"
},
"method_version": {
"type": "string"
},
"ndc": {
"type": "string"
},
"new": {
"type": [
"string",
"null"
]
},
"old": {
"type": [
"string",
"null"
]
},
"reason": {
"description": "CMS’s primary reason, from the NADAC Comparison file.",
"type": [
"string",
"null"
]
},
"source_sha256_new": {
"type": [
"string",
"null"
]
},
"source_sha256_old": {
"type": [
"string",
"null"
]
}
},
"required": [
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"as_of",
"ndc",
"description",
"field",
"old",
"new",
"effective",
"reason",
"detected_at",
"source_sha256_old",
"source_sha256_new",
"method_version"
],
"type": "object"
},
"type": "array"
}
},
"required": [
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"next_cursor"
],
"type": "object"
}
},
"type": "object"
},
"type": {
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"required": [
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],
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}
},
"required": [
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],
"type": "object"
}
}
},
"lastUpdated": "2026-10-22T16:53:53.461Z",
"quality": {
"l30DaysTotalCalls": 1,
"l30DaysUniquePayers": 1,
"lastCalledAt": "2026-10-22T16:53:53.297Z"
},
"resource": "https://data.spencermcw.com/v1/drug/nadac/changes",
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Which drug acquisition costs changed this week? NADAC per-unit cost changes and NDCs added or dropped, with CMS’s stated reason, 2025 on, from CMS’s weekly NADAC files. Updated weekly. $0.05 per call (x402, USDC on Base); 3 free calls a day."
}What the leaf hashes
{"body":"b8a629347d32b3de956757c3eaf0e0bb97b733c49aafe6f0b5678f4166782a72","id":73179,"kind":"listing","method":"baseline/1","observed_us":1793025487129146,"prev":null,"subject":"x402_bazaar:https://data.spencermcw.com/v1/drug/nadac/changes","subject_kind":"source_record"}Proof
Its day has not closed yet. A day closes ten minutes after midnight UTC; the proof appears here then.