data.spencermcw.com
Distill sells pre-computed answers to narrow factual questions to AI agents, per call, over x402 (HTTP 402 and a USDC payment on Base). Every answer carries its sources, an as_of time, a computed confidence and the method version that produced it. No account, API key or signup.
TradingLiveeip155:8453Exactvia cdp
Calls · 30d
2
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far.
$0.73
Verified settled volume
28 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-23 04:28Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xE6900aE625875b748f56Fb45C3e06a59Be8870DFThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xE6900aE625875b748f56Fb45C3e06a59Be8870DF",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://data.spencermcw.com/v1/drug/nadac",
"mimeType": "application/json",
"description": "What do US pharmacies pay for this drug? CMS’s National Average Drug Acquisition Cost (NADAC) per unit for an NDC, the generic’s NADAC for a brand and the weekly price history since January 2025, from CMS’s NADAC files on data.medicaid.gov. Updated weekly. $0.01 per call (x402, USDC on Base); 3 free calls a day."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"ndc": "00378410591"
}
},
"output": {
"type": "json",
"example": {
"data": {
"ndc": "00378410591",
"otc": false,
"listed": true,
"current": {
"as_of": "2026-10-21",
"effective_date": "2026-10-21",
"nadac_per_unit": "0.55226",
"explanation_codes": [
"1"
]
},
"history": [
{
"weeks": 1,
"last_as_of": "2026-10-21",
"first_as_of": "2026-10-21",
"effective_date": "2026-10-21",
"nadac_per_unit": "0.55226"
},
{
"weeks": 4,
"last_as_of": "2026-10-14",
"first_as_of": "2026-09-23",
"effective_date": "2026-09-23",
"nadac_per_unit": "0.54555"
},
{
"weeks": 5,
"last_as_of": "2026-09-16",
"first_as_of": "2026-08-19",
"effective_date": "2026-08-19",
"nadac_per_unit": "0.53801"
},
{
"weeks": 4,
"last_as_of": "2026-08-12",
"first_as_of": "2026-07-22",
"effective_date": "2026-07-22",
"nadac_per_unit": "0.55679"
},
{
"weeks": 5,
"last_as_of": "2026-07-15",
"first_as_of": "2026-06-17",
"effective_date": "2026-06-17",
"nadac_per_unit": "0.60124"
},
{
"weeks": 4,
"last_as_of": "2026-06-10",
"first_as_of": "2026-05-20",
"effective_date": "2026-05-20",
"nadac_per_unit": "0.64093"
},
{
"weeks": 4,
"last_as_of": "2026-05-13",
"first_as_of": "2026-04-22",
"effective_date": "2026-04-22",
"nadac_per_unit": "0.65861"
},
{
"weeks": 5,
"last_as_of": "2026-04-15",
"first_as_of": "2026-03-18",
"effective_date": "2026-03-18",
"nadac_per_unit": "0.65238"
},
{
"weeks": 4,
"last_as_of": "2026-03-11",
"first_as_of": "2026-02-18",
"effective_date": "2026-02-18",
"nadac_per_unit": "0.64179"
},
{
"weeks": 4,
"last_as_of": "2026-02-11",
"first_as_of": "2026-01-21",
"effective_date": "2026-01-21",
"nadac_per_unit": "0.63114"
},
{
"weeks": 5,
"last_as_of": "2026-01-14",
"first_as_of": "2025-12-17",
"effective_date": "2025-12-17",
"nadac_per_unit": "0.62468"
},
{
"weeks": 4,
"last_as_of": "2025-12-10",
"first_as_of": "2025-11-19",
"effective_date": "2025-11-19",
"nadac_per_unit": "0.62091"
},
{
"weeks": 4,
"last_as_of": "2025-11-12",
"first_as_of": "2025-10-22",
"effective_date": "2025-10-22",
"nadac_per_unit": "0.64489"
},
{
"weeks": 5,
"last_as_of": "2025-10-15",
"first_as_of": "2025-09-17",
"effective_date": "2025-09-17",
"nadac_per_unit": "0.67127"
},
{
"weeks": 4,
"last_as_of": "2025-09-10",
"first_as_of": "2025-08-20",
"effective_date": "2025-08-20",
"nadac_per_unit": "0.68204"
},
{
"weeks": 4,
"last_as_of": "2025-08-13",
"first_as_of": "2025-07-23",
"effective_date": "2025-07-23",
"nadac_per_unit": "0.67582"
},
{
"weeks": 5,
"last_as_of": "2025-07-16",
"first_as_of": "2025-06-18",
"effective_date": "2025-06-18",
"nadac_per_unit": "0.66208"
},
{
"weeks": 4,
"last_as_of": "2025-06-11",
"first_as_of": "2025-05-21",
"effective_date": "2025-05-21",
"nadac_per_unit": "0.6502"
},
{
"weeks": 4,
"last_as_of": "2025-05-14",
"first_as_of": "2025-04-23",
"effective_date": "2025-04-23",
"nadac_per_unit": "0.63617"
},
{
"weeks": 5,
"last_as_of": "2025-04-16",
"first_as_of": "2025-03-19",
"effective_date": "2025-03-19",
"nadac_per_unit": "0.61614"
},
{
"weeks": 4,
"last_as_of": "2025-03-12",
"first_as_of": "2025-02-19",
"effective_date": "2025-02-19",
"nadac_per_unit": "0.60252"
},
{
"weeks": 4,
"last_as_of": "2025-02-12",
"first_as_of": "2025-01-22",
"effective_date": "2025-01-22",
"nadac_per_unit": "0.59565"
},
{
"weeks": 3,
"last_as_of": "2025-01-15",
"first_as_of": "2025-01-01",
"effective_date": "2024-12-18",
"nadac_per_unit": "0.60042"
}
],
"description": "ABACAVIR 300 MG TABLET",
"last_listed": {
"as_of": "2026-10-21",
"effective_date": "2026-10-21",
"nadac_per_unit": "0.55226"
},
"pricing_unit": "EA",
"pharmacy_type": "C/I",
"classification": "G",
"same_description": {
"max": "0.55226",
"min": "0.55226",
"ndcs": 12
},
"corresponding_generic": null
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"ndc"
],
"properties": {
"ndc": {
"type": "string",
"pattern": "^(\\d{11}|\\d{4,5}-\\d{3,4}-\\d{1,2})$"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"data": {
"type": "object",
"required": [
"ndc",
"description",
"pricing_unit",
"otc",
"classification",
"pharmacy_type",
"listed",
"current",
"last_listed",
"corresponding_generic",
"same_description",
"history"
],
"properties": {
"ndc": {
"type": "string"
},
"otc": {
"type": "boolean"
},
"listed": {
"type": "boolean",
"description": "Whether the NDC is in the latest weekly file."
},
"current": {
"anyOf": [
{
"type": "object",
"required": [
"nadac_per_unit",
"effective_date",
"as_of",
"explanation_codes"
],
"properties": {
"as_of": {
"type": "string"
},
"effective_date": {
"type": "string"
},
"nadac_per_unit": {
"type": "string"
},
"explanation_codes": {
"type": "array",
"items": {
"type": "string"
}
}
},
"additionalProperties": false
},
{
"type": "null"
}
]
},
"history": {
"type": "array",
"items": {
"type": "object",
"required": [
"nadac_per_unit",
"effective_date",
"first_as_of",
"last_as_of",
"weeks"
],
"properties": {
"weeks": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
},
"last_as_of": {
"type": "string"
},
"first_as_of": {
"type": "string"
},
"effective_date": {
"type": "string"
},
"nadac_per_unit": {
"type": "string"
}
},
"additionalProperties": false
},
"description": "Price periods, newest first: runs of weekly files with the same NADAC."
},
"description": {
"type": "string"
},
"last_listed": {
"type": "object",
"required": [
"nadac_per_unit",
"effective_date",
"as_of"
],
"properties": {
"as_of": {
"type": "string"
},
"effective_date": {
"type": "string"
},
"nadac_per_unit": {
"type": "string"
}
},
"additionalProperties": false
},
"pricing_unit": {
"type": "string",
"description": "EA, ML or GM: the unit the NADAC is per."
},
"pharmacy_type": {
"type": "string"
},
"classification": {
"type": "string",
"description": "G generic, B brand (as CMS classifies for rate setting)."
},
"same_description": {
"type": "object",
"required": [
"ndcs",
"min",
"max"
],
"properties": {
"max": {
"type": "string"
},
"min": {
"type": "string"
},
"ndcs": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
}
},
"additionalProperties": false
},
"corresponding_generic": {
"anyOf": [
{
"type": "object",
"required": [
"nadac_per_unit",
"effective_date"
],
"properties": {
"effective_date": {
"type": [
"string",
"null"
]
},
"nadac_per_unit": {
"type": "string"
}
},
"additionalProperties": false
},
{
"type": "null"
}
]
}
},
"additionalProperties": false
}
}
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.01USDC≈ $0.01 USD
on Base · exact scheme
Pay 0.01 USDC on Base to 0xE690…870DF. The signed payment is good for 5 minutes.
- Paid to
- 0xE690…870DF
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 10000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xE6900aE625875b748f56Fb45C3e06a59Be8870DF",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"ndc": "00378410591"
}
},
"output": {
"type": "json",
"example": {
"data": {
"ndc": "00378410591",
"otc": false,
"listed": true,
"current": {
"as_of": "2026-10-21",
"effective_date": "2026-10-21",
"nadac_per_unit": "0.55226",
"explanation_codes": [
"1"
]
},
"history": [
{
"weeks": 1,
"last_as_of": "2026-10-21",
"first_as_of": "2026-10-21",
"effective_date": "2026-10-21",
"nadac_per_unit": "0.55226"
},
{
"weeks": 4,
"last_as_of": "2026-10-14",
"first_as_of": "2026-09-23",
"effective_date": "2026-09-23",
"nadac_per_unit": "0.54555"
},
{
"weeks": 5,
"last_as_of": "2026-09-16",
"first_as_of": "2026-08-19",
"effective_date": "2026-08-19",
"nadac_per_unit": "0.53801"
},
{
"weeks": 4,
"last_as_of": "2026-08-12",
"first_as_of": "2026-07-22",
"effective_date": "2026-07-22",
"nadac_per_unit": "0.55679"
},
{
"weeks": 5,
"last_as_of": "2026-07-15",
"first_as_of": "2026-06-17",
"effective_date": "2026-06-17",
"nadac_per_unit": "0.60124"
},
{
"weeks": 4,
"last_as_of": "2026-06-10",
"first_as_of": "2026-05-20",
"effective_date": "2026-05-20",
"nadac_per_unit": "0.64093"
},
{
"weeks": 4,
"last_as_of": "2026-05-13",
"first_as_of": "2026-04-22",
"effective_date": "2026-04-22",
"nadac_per_unit": "0.65861"
},
{
"weeks": 5,
"last_as_of": "2026-04-15",
"first_as_of": "2026-03-18",
"effective_date": "2026-03-18",
"nadac_per_unit": "0.65238"
},
{
"weeks": 4,
"last_as_of": "2026-03-11",
"first_as_of": "2026-02-18",
"effective_date": "2026-02-18",
"nadac_per_unit": "0.64179"
},
{
"weeks": 4,
"last_as_of": "2026-02-11",
"first_as_of": "2026-01-21",
"effective_date": "2026-01-21",
"nadac_per_unit": "0.63114"
},
{
"weeks": 5,
"last_as_of": "2026-01-14",
"first_as_of": "2025-12-17",
"effective_date": "2025-12-17",
"nadac_per_unit": "0.62468"
},
{
"weeks": 4,
"last_as_of": "2025-12-10",
"first_as_of": "2025-11-19",
"effective_date": "2025-11-19",
"nadac_per_unit": "0.62091"
},
{
"weeks": 4,
"last_as_of": "2025-11-12",
"first_as_of": "2025-10-22",
"effective_date": "2025-10-22",
"nadac_per_unit": "0.64489"
},
{
"weeks": 5,
"last_as_of": "2025-10-15",
"first_as_of": "2025-09-17",
"effective_date": "2025-09-17",
"nadac_per_unit": "0.67127"
},
{
"weeks": 4,
"last_as_of": "2025-09-10",
"first_as_of": "2025-08-20",
"effective_date": "2025-08-20",
"nadac_per_unit": "0.68204"
},
{
"weeks": 4,
"last_as_of": "2025-08-13",
"first_as_of": "2025-07-23",
"effective_date": "2025-07-23",
"nadac_per_unit": "0.67582"
},
{
"weeks": 5,
"last_as_of": "2025-07-16",
"first_as_of": "2025-06-18",
"effective_date": "2025-06-18",
"nadac_per_unit": "0.66208"
},
{
"weeks": 4,
"last_as_of": "2025-06-11",
"first_as_of": "2025-05-21",
"effective_date": "2025-05-21",
"nadac_per_unit": "0.6502"
},
{
"weeks": 4,
"last_as_of": "2025-05-14",
"first_as_of": "2025-04-23",
"effective_date": "2025-04-23",
"nadac_per_unit": "0.63617"
},
{
"weeks": 5,
"last_as_of": "2025-04-16",
"first_as_of": "2025-03-19",
"effective_date": "2025-03-19",
"nadac_per_unit": "0.61614"
},
{
"weeks": 4,
"last_as_of": "2025-03-12",
"first_as_of": "2025-02-19",
"effective_date": "2025-02-19",
"nadac_per_unit": "0.60252"
},
{
"weeks": 4,
"last_as_of": "2025-02-12",
"first_as_of": "2025-01-22",
"effective_date": "2025-01-22",
"nadac_per_unit": "0.59565"
},
{
"weeks": 3,
"last_as_of": "2025-01-15",
"first_as_of": "2025-01-01",
"effective_date": "2024-12-18",
"nadac_per_unit": "0.60042"
}
],
"description": "ABACAVIR 300 MG TABLET",
"last_listed": {
"as_of": "2026-10-21",
"effective_date": "2026-10-21",
"nadac_per_unit": "0.55226"
},
"pricing_unit": "EA",
"pharmacy_type": "C/I",
"classification": "G",
"same_description": {
"max": "0.55226",
"min": "0.55226",
"ndcs": 12
},
"corresponding_generic": null
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"required": [
"ndc"
],
"properties": {
"ndc": {
"type": "string",
"pattern": "^(\\d{11}|\\d{4,5}-\\d{3,4}-\\d{1,2})$"
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"data": {
"type": "object",
"required": [
"ndc",
"description",
"pricing_unit",
"otc",
"classification",
"pharmacy_type",
"listed",
"current",
"last_listed",
"corresponding_generic",
"same_description",
"history"
],
"properties": {
"ndc": {
"type": "string"
},
"otc": {
"type": "boolean"
},
"listed": {
"type": "boolean",
"description": "Whether the NDC is in the latest weekly file."
},
"current": {
"anyOf": [
{
"type": "object",
"required": [
"nadac_per_unit",
"effective_date",
"as_of",
"explanation_codes"
],
"properties": {
"as_of": {
"type": "string"
},
"effective_date": {
"type": "string"
},
"nadac_per_unit": {
"type": "string"
},
"explanation_codes": {
"type": "array",
"items": {
"type": "string"
}
}
},
"additionalProperties": false
},
{
"type": "null"
}
]
},
"history": {
"type": "array",
"items": {
"type": "object",
"required": [
"nadac_per_unit",
"effective_date",
"first_as_of",
"last_as_of",
"weeks"
],
"properties": {
"weeks": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
},
"last_as_of": {
"type": "string"
},
"first_as_of": {
"type": "string"
},
"effective_date": {
"type": "string"
},
"nadac_per_unit": {
"type": "string"
}
},
"additionalProperties": false
},
"description": "Price periods, newest first: runs of weekly files with the same NADAC."
},
"description": {
"type": "string"
},
"last_listed": {
"type": "object",
"required": [
"nadac_per_unit",
"effective_date",
"as_of"
],
"properties": {
"as_of": {
"type": "string"
},
"effective_date": {
"type": "string"
},
"nadac_per_unit": {
"type": "string"
}
},
"additionalProperties": false
},
"pricing_unit": {
"type": "string",
"description": "EA, ML or GM: the unit the NADAC is per."
},
"pharmacy_type": {
"type": "string"
},
"classification": {
"type": "string",
"description": "G generic, B brand (as CMS classifies for rate setting)."
},
"same_description": {
"type": "object",
"required": [
"ndcs",
"min",
"max"
],
"properties": {
"max": {
"type": "string"
},
"min": {
"type": "string"
},
"ndcs": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
}
},
"additionalProperties": false
},
"corresponding_generic": {
"anyOf": [
{
"type": "object",
"required": [
"nadac_per_unit",
"effective_date"
],
"properties": {
"effective_date": {
"type": [
"string",
"null"
]
},
"nadac_per_unit": {
"type": "string"
}
},
"additionalProperties": false
},
{
"type": "null"
}
]
}
},
"additionalProperties": false
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-23 04:28Z
- Last indexed by Roundhouse
- 2026-10-26 17:40Z
- Last enriched (probe, favicon, geo)
- 2026-10-22 20:46Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 4 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service data.spencermcw.com and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=data.spencermcw.com' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://data.spencermcw.com/v1/drug/nadac, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.