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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 fsthum.vercel.app, paid per call via x402, $0.35/call, status unknown (last checked 2026-10-27).
Compares 2–5 FRED economic time series side-by-side, returning aligned observations for cross-series macroeconomic analysis.
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
A JSON object containing a 'source' string (FRED attribution) and a 'comparison' object with aligned time series observations for each requested FRED series ID, enabling direct cross-series temporal comparison.
Example use cases
Inflation vs interest rate analysis
“Compare the last 24 observations for FRED's FEDFUNDS and CPIAUCSL series — I want to see how the Fed's rate moves relate to inflation over time.”
Recession indicator dashboard
“Fetch the last 12 data points each for GDP, UNRATE, and T10Y2Y from FRED and compare them so I can see how growth, unemployment, and the yield curve moved together.”
Housing market macro context
“Get me the last 15 observations for MORTGAGE30US, CPIAUCSL, and FEDFUNDS from FRED and compare them side by side so I can see how mortgage rates track with inflation and the Fed funds rate.”
Technical details
Endpoint
POSThttps://fsthum.vercel.app/api/compare?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to compare multiple FRED macroeconomic time series simultaneously in a single call — ideal for correlation analysis, dashboard building, or research that requires aligned observations across indicators like GDP, CPI, unemployment, and interest rates. Prefer this over single-series endpoints when cross-series comparison is the core goal.
Side effects
- Invalid or non-existent FRED series ID returns an error or empty data for that series
- Requesting fewer than 2 or more than 5 series IDs may be rejected
- Non-numeric or malformed limit value may cause default behavior or error
- FRED upstream downtime may result in empty or stale comparison data
- Payment failure (x402) prevents the call from being processed
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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