# Fathom — Macroeconomic Data API (Popular Series)

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

Returns a list of popular macroeconomic time series from the FRED database, including GDP, inflation, unemployment, and interest rate data

## Facts

- Endpoint: POST https://fredfathom.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-cd0b1fcc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-IkrjyxnmWzsvDEmEAFmF

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-cd0b1fcc -d '<json body>'
```

Example prompt: Pull up the most popular macroeconomic time series from FRED — I want to see what economic indicators like GDP, inflation, and unemployment are trending and available to explore.

## When to prefer this

Use this endpoint when you need to discover which macroeconomic time series are most popular or relevant before fetching specific data, or when you want a curated starting set of economic indicators (GDP, inflation, unemployment, interest rates) without knowing exact FRED series IDs. Prefer this for economic research bootstrapping, dashboard population, or macroeconomic monitoring setup.

## Known failure modes

- Payment failure (x402 payment of 0.04 USDC not accepted or wallet issue)
- Rate limiting or server unavailability on the Vercel deployment
- Empty or malformed response if FRED upstream is unavailable
- Network timeout if the FRED data source is slow to respond

## 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 popular FRED economic time series, each likely including the series ID, name, description, frequency, units, and other metadata needed to identify and subsequently fetch the actual time series data.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-popular-series-cd0b1fcc/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fredfathom.vercel.app](https://www.zero.xyz/host/fredfathom.vercel.app/llms.txt)