# Fathom Macroeconomic Data API — Popular Series

> Fathom Macroeconomic Data API — Popular Series is a paid API for AI agents from fathoms.vercel.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-15).

Returns a curated list of the most popular macroeconomic time series available from the FRED-powered Fathom dataset

## Facts

- Endpoint: POST https://fathoms.vercel.app/api/popular
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fathom-macroeconomic-data-api-popular-series-7fa4b854
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PxZYw9UdC8DXCD1K56rV6

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fathom-macroeconomic-data-api-popular-series-7fa4b854 -d '<json body>'
```

Example prompt: Pull up the most popular macroeconomic time series from Fathom's FRED-powered API — I want to see which economic indicators like GDP, inflation, and unemployment are most frequently used so I can decide what to query next.

## When to prefer this

Choose this endpoint when you need a curated starting point for macroeconomic data exploration — specifically when you want to discover which FRED time series are most popular or relevant before making more targeted data queries. Prefer this over direct FRED API access when you want a simplified, pay-per-call interface without managing API keys, or when you need a quick overview of top economic indicators rather than searching across 816,000+ series manually.

## Known failure modes

- Payment not provided or insufficient USDC balance (402 Payment Required)
- POST body malformed or unexpected format causing 400 error
- Service unavailable due to Vercel cold start or upstream FRED API outage
- Empty or truncated response if upstream FRED data source is temporarily unavailable
- Rate limiting if called too frequently in a short window

## 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 list of the most popular macroeconomic time series available in the Fathom/FRED dataset, likely including series identifiers, names, descriptions, and possibly popularity metrics or metadata for each indicator (e.g. GDP, CPI, unemployment rate, federal funds rate).

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-popular-series-7fa4b854/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fathoms.vercel.app](https://www.zero.xyz/host/fathoms.vercel.app/llms.txt)