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Fathom Macroeconomic Data API — Tag Series Search
x402
Fathom Macroeconomic Data API — Tag Series Search is a paid API for AI agents from fathoms.vercel.app, paid per call via x402, $0.06/call, status unknown (last checked 2026-09-15).
Returns a list of FRED economic time series matching a given tag (e.g. 'gdp', 'inflation', 'monthly', 'nsa')
Price / call$0.06
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 tag name queried, an array of matching FRED economic time series objects (each with series metadata such as ID, title, frequency, units, and observation dates), and a source attribution string. The number of series returned is capped by the optional limit parameter (default 20).
Example use cases
Research CPI inflation data series
“Search for all FRED economic time series tagged 'inflation' and give me a list of up to 25 series I can pull data from.”
Find monthly unemployment indicators
“I need to see what monthly unemployment time series are available in FRED — can you search Fathom for series tagged 'monthly' with a limit of 20?”
Discover NSA GDP economic series
“Pull up all FRED series tagged 'nsa' related to GDP so I can find not-seasonally-adjusted national output data — give me up to 30 results.”
Technical details
Endpoint
POSThttps://fathoms.vercel.app/api/tag-seriesWhen to prefer
Use this endpoint when you need to discover which FRED economic time series exist under a particular topic or tag — ideal for browsing or enumerating available datasets before fetching actual data values. Prefer this over a direct series lookup when the user does not yet know the specific FRED series ID and wants to explore what is available under a broad macroeconomic theme like 'gdp', 'inflation', or 'unemployment'.
Side effects
- Unknown or misspelled tag returns empty series array
- Missing required 'tag' field returns validation error
- Limit parameter as non-numeric string may cause unexpected defaults
- FRED upstream outage results in failed or stale response
- Rate limiting or payment failure (x402) blocks access
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tagrequired | string | Tag name (e.g. gdp, monthly, inflation, nsa) |
| limit | string | Max results (default: 20) |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| tag | string | |
| series | array | |
| sourcerequired | string |
Tags
x402
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