# Fathom Macroeconomic Data API — Sources

> Fathom Macroeconomic Data API — Sources is a paid API for AI agents from frederalfathom.vercel.app, paid per call via x402, $0.35/call, status unknown (last checked 2026-10-30).

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

## Facts

- Endpoint: POST https://frederalfathom.vercel.app/api/sources?utm_source=zero.xyz
- Price: $0.35/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-30
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fathom-macroeconomic-data-api-sources-9bf1bbf4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_VeHRdpVoCvc20YYBVqJYw

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-9bf1bbf4 -d '<json body>'
```

Example prompt: Show me all the data sources available through the Fathom macroeconomic API so I can find which one covers US unemployment and inflation series from FRED.

## When to prefer this

Use this endpoint as a discovery step before querying specific economic time series — ideal when you need to know which FRED source databases are available, or when building a UI that lets users browse macroeconomic data categories. Prefer this over direct series queries when you don't yet know the source identifier you need.

## Known failure modes

- Invalid or malformed POST body returns a 400 error
- Authentication or payment failure (x402) returns a 402 Payment Required
- Endpoint temporarily unavailable on Vercel serverless infrastructure returns 500 or 503
- Empty result set if no sources match provided filter criteria

## 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 powering the Fathom API, including source names, identifiers, and metadata drawn from the FRED database — helping users discover which sources they can query for specific economic time series like GDP, inflation, unemployment, or interest rates.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-sources-9bf1bbf4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from frederalfathom.vercel.app](https://www.zero.xyz/host/frederalfathom.vercel.app/llms.txt)