# Fathom Macroeconomic Data API — Popular Series

> Fathom Macroeconomic Data API — Popular Series is a paid API for AI agents from fredthom.vercel.app, paid per call via x402, $0.35/call, status unknown (last checked 2026-09-16).

Returns a curated list of popular macroeconomic time series (GDP, inflation, unemployment, interest rates, etc.) sourced from the FRED database

## Facts

- Endpoint: POST https://fredthom.vercel.app/api/popular
- Price: $0.35/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fathom-macroeconomic-data-api-popular-series-6fc02e06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LKubjl8YZ2GPr0V2A1w4_

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-6fc02e06 -d '<json body>'
```

Example prompt: Can you pull up the most popular macroeconomic data series available — things like GDP, inflation, unemployment, and interest rates — so I can see what economic indicators are most widely tracked?

## When to prefer this

Use this endpoint when you need a curated starting point of widely-used macroeconomic indicators rather than searching across 816,000+ series. Ideal for bootstrapping an economic dashboard, discovering which FRED series to track, or presenting users with a meaningful default set of economic KPIs. Prefer this over a search endpoint when you do not have a specific series ID in mind.

## Known failure modes

- 402 Payment Required if USDC payment not attached
- POST body malformed or missing required fields returns 400
- FRED upstream unavailable causes 502 or timeout
- Rate limit exceeded returns 429
- Empty result set if no popular series match applied filters

## 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 including series IDs, names, descriptions, units, frequency (e.g. monthly, quarterly), and possibly observation counts or popularity scores — covering indicators like GDP growth, CPI inflation, unemployment rate, and federal funds rate

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-popular-series-6fc02e06/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fredthom.vercel.app](https://www.zero.xyz/host/fredthom.vercel.app/llms.txt)