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Fathom Macroeconomic Data API — Related Series
x402
Fathom Macroeconomic Data API — Related Series is a paid API for AI agents from fredfathom.vercel.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-10-12).
Returns FRED series related to a given FRED series ID, including category metadata
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 the data source attribution, the queried series ID, and an array of category objects describing the categories that FRED associates with the given series — enabling discovery of related economic time series within the same classification hierarchy.
Example use cases
Exploring GDP-related economic indicators
“I'm analyzing US economic growth — can you find all FRED series related to the GDP series ID 'GDP' so I know what companion datasets exist?”
Discovering inflation data neighbors
“I'm building a dashboard around CPI inflation. What other FRED series are related to CPIAUCSL so I can find nearby indicators to include?”
Mapping federal funds rate context
“I want to understand what economic series are connected to the federal funds rate — can you look up related FRED series for FEDFUNDS and show me the categories they fall into?”
Technical details
Endpoint
POSThttps://fredfathom.vercel.app/api/related?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to discover which FRED categories a specific economic series belongs to, or want to find related macroeconomic datasets programmatically without browsing the FRED website. Ideal for agents building economic research tools, dashboards, or automated data pipelines that need to traverse the FRED taxonomy. Prefer this over the main series-fetch endpoints when the goal is exploration and discovery rather than retrieving actual time series values.
Side effects
- Invalid or non-existent FRED series ID returns an error or empty categories array
- Network timeout on the Vercel-hosted endpoint
- Payment failure if USDC balance is insufficient for the $0.04 per-call fee
- Rate limiting or quota exhaustion on the underlying FRED API
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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