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Fathom Macroeconomic Data API — Compare Series
x402
Fathom Macroeconomic Data API — Compare Series is a paid API for AI agents from fathom-opal.vercel.app, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-14).
Compares 2–5 FRED economic time series side-by-side, returning aligned observations for cross-series analysis
Price / call$0.15
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 structured comparison object containing aligned time series observations for each requested FRED series ID, along with a source attribution string identifying FRED as the data provider. The comparison object maps each series ID to its observations, enabling side-by-side analysis of up to 5 macroeconomic indicators.
Example use cases
Inflation vs Interest Rate analysis
“Compare the Consumer Price Index (CPIAUCSL) and the Federal Funds Rate (FEDFUNDS) using the last 24 observations — I want to see how rate hikes have tracked inflation over time.”
Labor market snapshot across indicators
“Can you pull the last 12 data points for unemployment (UNRATE), labor force participation (CIVPART), and job openings (JTSJOL) from FRED and compare them so I can understand the current labor market?”
GDP and recession indicator comparison
“Compare US real GDP (GDPC1) with the NBER recession indicator (USREC) over the last 40 observations so I can see how GDP moved during recessions.”
Technical details
Endpoint
POSThttps://fathom-opal.vercel.app/api/compareWhen to prefer
Use this endpoint when you need to compare multiple macroeconomic time series simultaneously and already know the FRED series IDs. It is ideal for correlation analysis, charting economic trends across indicators, or building dashboards that juxtapose GDP, inflation, unemployment, or interest rate data. Prefer this over single-series endpoints when the user's question involves relationships between two or more indicators.
Side effects
- Invalid FRED series ID returns an error or empty data for that series
- Fewer than 2 or more than 5 series IDs provided may return a validation error
- Series with different frequencies (e.g. monthly vs quarterly) may not align cleanly
- Rate limiting or upstream FRED API unavailability causes 5xx errors
- Invalid limit parameter (non-numeric or out-of-range) may cause unexpected behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | string | Observations per series (default: 10) |
| seriesIdsrequired | array | Array of 2-5 FRED series IDs to compare |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| sourcerequired | string | |
| comparison | object |
Tags
x402
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