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Fathom Macroeconomic Data API — Category Tags
x402
Fathom Macroeconomic Data API — Category Tags is a paid API for AI agents from fathoms.vercel.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).
Returns the tags associated with a FRED economic data category, enabling discovery and filtering of time series within that category
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 an array of tag objects associated with the specified FRED category, along with the data source identifier and the category ID that was queried. Each tag object describes a topic, frequency, geography, or other classification attribute that applies to time series within that category.
Example use cases
Exploring inflation data categories
“I'm looking at FRED category 32455 which covers consumer price indexes — can you pull all the tags for that category so I can see how the data is classified and find the right series for CPI inflation analysis?”
Filtering unemployment time series
“Before I start pulling unemployment data, can you grab all the tags for FRED category 33509 so I can figure out which filters to apply to narrow down to U.S. monthly seasonally adjusted series?”
Building an economic dashboard topic map
“I need to map out what economic topics are covered in FRED category 106 on interest rates — can you retrieve all the tags for that category so I can categorize them for my macroeconomic dashboard?”
Technical details
Endpoint
POSThttps://fathoms.vercel.app/api/category-tagsWhen to prefer
Use this endpoint when you need to discover, enumerate, or filter the classification tags for a specific FRED economic category before pulling actual time series data. It is ideal for building metadata-driven navigation of the FRED data catalog, constructing filtered search queries, or understanding what subcategories and topic dimensions exist within a given category. Prefer this over general FRED search when you already have a category ID and need to understand its taxonomy.
Side effects
- Invalid or non-existent categoryId returns an empty tags array or error
- FRED API upstream outage causes failure or delayed response
- Malformed request body missing required categoryId field returns a 400 error
- Rate limiting or payment verification failure returns a 402 or 429 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| categoryIdrequired | string | FRED category ID |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| tags | array | |
| sourcerequired | string | |
| category_id | string |
Tags
x402
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