# Fathom Macroeconomic Data API — Sources Endpoint

> Fathom Macroeconomic Data API — Sources Endpoint is a paid API for AI agents from fredthom.vercel.app, paid per call via x402, $0.35/call, status unknown (last checked 2026-09-15).

Lists available macroeconomic data sources accessible through the Fathom API, which is powered by the FRED database with 816,000+ economic time series.

## Facts

- Endpoint: POST https://fredthom.vercel.app/api/sources
- Price: $0.35/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-44f84953
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DGB9JcbNHHYNryXCcsAIx

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-44f84953 -d '<json body>'
```

Example prompt: What data sources are available in the Fathom macroeconomic API — I want to see all the FRED-backed sources I can pull GDP, inflation, and unemployment data from.

## When to prefer this

Use this endpoint when you need to discover what macroeconomic data sources are available before querying specific time series. Ideal as a first step in a workflow where you need to identify the right source for GDP, CPI, unemployment, interest rate, or other macro data. Prefer over direct FRED API when you want a managed, pay-per-call interface without managing your own FRED API key.

## Known failure modes

- 402 Payment Required if USDC payment of $0.35 not provided via x402 protocol
- 500 server error if the underlying FRED connection is unavailable
- Empty or partial source list if upstream FRED API is rate-limited
- Timeout if the Vercel serverless function exceeds execution limits

## 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 available macroeconomic data sources within the Fathom/FRED-powered system, including source identifiers and metadata that can be used to query specific economic time series.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-macroeconomic-data-api-sources-endpoint-44f84953/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)