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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 fathom-opal.vercel.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).
Returns related FRED economic time series and their categories for a given 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 source (FRED), the queried series ID, and an array of related series objects with their category metadata, enabling discovery of contextually connected economic time series.
Example use cases
Expanding research on inflation indicators
“I'm researching inflation and I've been looking at the CPIAUCSL series — can you find me related FRED series so I can explore nearby indicators and see what categories they fall under?”
Building a GDP dashboard with related metrics
“I'm putting together an economic dashboard around US GDP. Can you look up FRED series GDP and find related series so I know what other indicators to pull in alongside it?”
Discovering interest rate data neighbors
“I'm analyzing the federal funds rate using FEDFUNDS in FRED — what other series are related to it and what economic categories do they belong to?”
Technical details
Endpoint
POSThttps://fathom-opal.vercel.app/api/relatedWhen to prefer
Use this endpoint when you need to discover economic time series that are related to a known FRED series ID — ideal for expanding economic research, building dashboards, or exploring the FRED taxonomy around a specific indicator. Prefer this over a general FRED series search when you already have a specific series ID and want to find its neighbors or category context.
Side effects
- Invalid or nonexistent FRED series ID returns empty or error response
- Missing required seriesId field returns validation error
- Downstream FRED API unavailability causes service failure
- Payment not provided or insufficient USDC results in x402 payment required error
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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