# Fathom Macroeconomic Data API — Sources Endpoint

> Fathom Macroeconomic Data API — Sources Endpoint 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).

Lists available macroeconomic data sources powering the Fathom API, which provides access to 816,000+ FRED economic time series

## Facts

- Endpoint: POST https://fathoms.vercel.app/api/sources
- 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-sources-endpoint-760082ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a5UE0ZtGRj57bUOICZ0mA

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-endpoint-760082ec -d '<json body>'
```

Example prompt: What data sources are available through the Fathom macro API? I want to see which economic databases I can pull from before I start querying GDP or inflation series.

## When to prefer this

Use this endpoint when you need to discover which data sources are available before querying specific economic time series. It is the right first call in a workflow that involves browsing or searching FRED-backed macroeconomic data via Fathom, especially when you don't yet know which source ID to pass to downstream series queries. Prefer this over direct FRED API access when you want a single micropayment-gated, simplified interface to FRED's catalog.

## Known failure modes

- Payment not provided or insufficient USDC — 402 Payment Required
- POST body malformed or unexpected content type — 400 Bad Request
- Vercel serverless cold start causing timeout on first call
- Service temporarily unavailable on Fathom's Vercel deployment — 503
- No sources returned if underlying FRED connection is down

## 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 macroeconomic data sources available through the Fathom API, likely including source names, IDs, and descriptions corresponding to FRED data providers. Enables callers to understand which economic databases underpin the 816,000+ available time series before making targeted series queries.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-sources-endpoint-760082ec/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)