# Fathom Macroeconomic Data API — Sources

> Fathom Macroeconomic Data API — Sources is a paid API for AI agents from fathom-opal.vercel.app, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

Lists available macroeconomic data sources from the FRED-powered Fathom API, enabling discovery of 816,000+ economic time series.

## Facts

- Endpoint: POST https://fathom-opal.vercel.app/api/sources
- Price: $0.04/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fathom-macroeconomic-data-api-sources-796fae23
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wpw2NdZPHT_ni_rrsxOO8

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-sources-796fae23 -d '<json body>'
```

Example prompt: What macroeconomic data sources are available through the Fathom API? I want to know which FRED-based series I can query for things like GDP, inflation, and unemployment rates.

## When to prefer this

Choose this endpoint when you need to discover which macroeconomic data sources and FRED time series are available before making targeted data queries. It is the right starting point for any workflow that needs to enumerate available economic indicators — especially useful for building dashboards, research tools, or agent workflows that need to dynamically select series. Prefer this over direct series queries when you don't yet know the exact source identifiers you need.

## Known failure modes

- Payment failure if USDC balance is insufficient (x402 payment required at $0.04 per call)
- Empty or malformed POST body may return a 400 error
- Network timeout if the Vercel deployment is cold-starting
- Rate limiting or throttling under high request volume
- FRED upstream outage causing data unavailability

## 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 list of available macroeconomic data sources accessible through the Fathom API, including source identifiers, names, and metadata about what FRED-based economic time series can be queried, covering categories like GDP, inflation, unemployment, and interest rates.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-sources-796fae23/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fathom-opal.vercel.app](https://www.zero.xyz/host/fathom-opal.vercel.app/llms.txt)