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Parkland Archives: 1900 Sears Catalog Price Modern Value Converter
x402
Parkland Archives: 1900 Sears Catalog Price Modern Value Converter is a paid API for AI agents from history.parklandarchives.com, paid per call via x402, $0.06/call, status unknown (last checked 2026-09-13).
Looks up a 1900 Sears catalog item by item number or raw price and returns its inflation-adjusted modern USD equivalent using Federal Reserve CPI data.
Price / call$0.06
Success—
StatusUnknown
How this service works
Structured historical data from verified primary sources — 1900 Sears catalog prices, World Almanac statistics, and more. Queryable by AI agents via x402 micropayments on Base.
Output
Returns a JSON object with: the found flag, a full product record (item number, product name, category, original USD price, source page, catalog year, materials, and data quality flags), the inflation multiplier (e.g. 38.7x), the original year, modern year, and the calculated modern USD value. Also includes the authoritative source citation (Federal Reserve Bank of Minneapolis CPI).
Example use cases
Inflation-adjust a known catalog item
“I found a reference to Sears item 3T400 — a cloth-bound blacksmithing book — priced at 60 cents in 1900. What would that cost in 2025 dollars?”
Research 1900 goods purchasing power
“I'm writing an article about early 1900s consumer prices. Can you look up what a $1.25 price tag in 1900 would be worth in today's money using the Federal Reserve CPI data?”
Antique valuation historical context
“I have a vintage Sears item I'm appraising. Its 1900 catalog price was $4.50 — can you convert that to the modern equivalent so I can put it in historical context for the listing?”
Technical details
Endpoint
GEThttps://history.parklandarchives.com/api/catalog-prices/modern-valueWhen to prefer
Choose this endpoint when you need inflation-adjusted modern dollar values for specific 1900 Sears catalog items, or to convert any arbitrary 1900 USD price to its 2025 equivalent using academically-grounded CPI methodology. Prefer this over generic inflation calculators when you also want structured product metadata (category, materials, source page) alongside the conversion.
Side effects
- Item number not found in catalog — returns found: false
- Neither price_usd nor item_number provided — missing required query parameter
- Invalid item number format — no matching record
- Price value of 0 or negative — may produce unexpected results
- Payment failure via x402 micropayment — call not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"found": true,
"record": {
"id": 44,
"category": "books",
"priceUsd": 0.6,
"createdAt": "2026-07-14T21:51:18.595Z",
"materials": "cloth",
"uncertain": false,
"flagReason": null,
"itemNumber": "3T400",
"sourcePage": 130,
"catalogYear": 1900,
"productName": "Practical Blacksmithing, Volume I",
"catalogSeason": null,
"sourceIdentifier": "catalogueno11200sear"
},
"source": "Federal Reserve Bank of Minneapolis, Consumer Price Index 1800- (official BLS CPI from 1913, academic estimates before)",
"modernYear": 2025,
"multiplier": 38.7,
"originalYear": 1900,
"modernValueUsd": 23.22,
"originalPriceUsd": 0.6
}
}Tags
x402
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