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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 fredthom.vercel.app, paid per call via x402, $0.35/call, status unknown (last checked 2026-09-14).
Returns related FRED economic time series and their categories for a given FRED series ID
Price / call$0.35
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 the source attribution (FRED), the queried series ID, and an array of related series objects including their categories — useful for navigating the FRED data graph and discovering related economic indicators.
Example use cases
Example prompt
“What FRED series are related to GDP (series ID 'GDP')? I want to discover other connected economic indicators and which categories they fall under.”
Technical details
Endpoint
POSThttps://fredthom.vercel.app/api/relatedWhen to prefer
Use this endpoint when you have a known FRED series ID and want to discover related or adjacent economic data series and their categories, enabling exploration of the FRED data graph. Prefer this over a general search when you already know the anchor series and want to branch out to related indicators.
Side effects
- Invalid or unknown FRED series ID returns empty or error response
- Network timeout if FRED upstream is slow
- Missing required seriesId field returns a validation error
- Series ID with no related series returns empty categories array
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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