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Fathom Macroeconomic Data API — Related Series Lookup
x402
Fathom Macroeconomic Data API — Related Series Lookup 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 related FRED economic time series and categories for a given FRED series ID
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 containing the data source attribution, the queried series ID, and an array of related category objects — each describing a FRED category that the series belongs to or is associated with, enabling discovery of adjacent economic indicators.
Example use cases
Discovering related inflation indicators
“I'm researching inflation — can you look up what FRED series are related to CPIAUCSL and show me the categories it belongs to?”
Exploring related GDP growth series
“For the GDP series on FRED, can you pull up all the related economic time series and categories so I can find adjacent indicators to build my analysis?”
Finding related interest rate data
“I want to explore data connected to the federal funds rate — can you check what FRED series are related to FEDFUNDS and list the categories it's grouped under?”
Technical details
Endpoint
POSThttps://fathoms.vercel.app/api/relatedWhen to prefer
Use this endpoint when you need to discover what economic indicators are related to a known FRED series ID — ideal for exploring the FRED taxonomy, building economic dashboards with related data, or finding adjacent indicators for research. Prefer this over a general FRED series search when you already have a specific series ID and want to understand its categorical context and related series.
Side effects
- Invalid or non-existent FRED series ID returns an error or empty categories array
- Missing required seriesId field returns a validation error
- FRED upstream outage may cause failed or stale responses
- Rate limits or payment failures (x402) will block access
- Very obscure or deprecated series IDs may return no related categories
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| seriesIdrequired | string | FRED series ID |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| sourcerequired | string | |
| series_id | string | |
| categories | array |
Tags
x402
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