# Sources and citations

Responses include a `source` block, complete for the six [Apizie Finance](/finance) sources, so your agent can cite the data and your users can check it.

jsonCopy
```
{
  "project": "finance:fred",
  "data": { "series": "FEDFUNDS", "observations": [ … ] },
  "source": {
    "official": true,
    "provider": "FRED",
    "publisher": "Federal Reserve Bank of St. Louis",
    "url": "https://fred.stlouisfed.org/series/FEDFUNDS",
    "apiUrl": "https://api.stlouisfed.org/fred/series/observations?series_id=FEDFUNDS&…",
    "retrievedAt": "2026-10-30T09:12:44.000Z",
    "license": "Free to use under the FRED API Terms of Use; …",
    "licenseUrl": "https://fred.stlouisfed.org/docs/api/terms_of_use.html",
    "attribution": "Source: Federal Reserve Bank of St. Louis (FRED), retrieved 2026-10-30, https://fred.stlouisfed.org/series/FEDFUNDS",
    "notice": "This product uses the FRED® API but is not endorsed or certified by the Federal Reserve Bank of St. Louis."
  },
  "timestamp": "2026-10-30T09:12:44.120Z"
}
```

| Field | Meaning |

| `official` | `true` when the data came from one of the six [official sources](/sources) |

| `provider`, `publisher` | The source and the organisation that publishes it |

| `url` | A page a person can open to check the value |

| `apiUrl` | The official API URL that was called, with credentials removed (also in the `X-Source` header) |

| `retrievedAt` | When the data was fetched from the source. Cached answers keep the original time. |

| `license`, `licenseUrl` | The publisher's terms |

| `attribution` | A ready-to-use citation line |

| `notice` | Text a publisher asks you to show (FRED) |

| `also` | Other URLs used to build the answer (for example a ticker lookup) |

## Per-value sources
Combined endpoints cite each section, and values taken from a filing link to that filing. In `official:company/profile`, `financials.items.revenue.source` is the SEC filing index for the 10-K the number came from.

## Prompting an agent
Over MCP the server tells agents to cite `source`. In your own prompts, ask for it: “Answer with the figure and cite source.attribution.”

## Licence rules we apply
- FRED series that FRED marks as copyrighted by a third party are refused with a clear error.
- SEC requests identify Apizie with a contact address and stay under the SEC's fair-access rate.
- Apizie is independent and not affiliated with or endorsed by the SEC, the Federal Reserve, the ECB, the U.S. Treasury, GLEIF or the World Bank.