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Fathom Macroeconomic Data API — Categories
x402
Fathom Macroeconomic Data API — Categories is a paid API for AI agents from fathom-opal.vercel.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).
Retrieves the hierarchical category tree from FRED's macroeconomic data catalog, listing top-level or sub-categories of economic time series
Price / call$0.04
Success—
StatusUnknown
How this service works
Free macroeconomic data API powered by FRED. 816,000+ economic time series. GDP, inflation, unemployment, interest rates, and more.
Output
Returns a JSON object with a source field (identifying the data provider), a category_id field (the queried category), and a categories array containing objects with names and IDs of categories at the requested level of the FRED hierarchy
Example use cases
Exploring FRED data hierarchy
“What are all the top-level categories in the FRED economic database? I want to understand what broad areas of macroeconomic data are available before I start digging in.”
Finding sub-categories for GDP data
“I'm looking at FRED category 18 for national accounts — can you list the sub-categories under it so I know which one to use for GDP data?”
Building an economic data navigator
“List all the child categories under FRED category 32991 so I can map out the full structure of the money, banking, and finance section for my research dashboard.”
Technical details
Endpoint
POSThttps://fathom-opal.vercel.app/api/categoriesWhen to prefer
Use this endpoint when you need to browse or navigate the structure of the FRED macroeconomic data catalog before fetching specific time series data. Prefer it over a direct series search when the user wants to explore available data types hierarchically rather than querying a known series ID. Ideal for building category-aware data exploration flows.
Side effects
- Invalid or non-existent categoryId returns an empty categories array or error
- Network timeouts on the Vercel-hosted service
- Payment authorization failure via x402 protocol blocks the request
- Malformed request body (e.g. categoryId as a number instead of string) may return a 400 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| categoryId | string | Category ID (default: 0 for top-level) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| sourcerequired | string | |
| categories | array | |
| category_id | string |
Tags
x402
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