# federalregister.latest

**stable** **Advanced**

Latest Federal Register documents.

`GET /v1/federalregister/latest`

## What you get

A list of Federalregister results in Onekey's unified shape, in `data` (an array). An empty array is a normal, successful answer and is charged like any other; a source that reports "nothing found" as an error returns a free `404 not_found` instead.

## What it costs

- **Advanced · 5 credits** for a fresh fetch, charged only when it succeeds.
- **Free when served from cache (0.2 credit for a cached response over 100 KB).**
- **Free** if the request is invalid (never charged) or the source fails or reports not found (refunded).

## Parameters

| Name | Type | Required | Default | What it is | Constraints |
| --- | --- | --- | --- | --- | --- |
| `per_page` | string | no | `20` | Rows (1-100) | max 3 chars; must match `[1-9]\d?\|100`; trimmed |

## Request

```bash
curl "https://api.onekey.dev/v1/federalregister/latest?per_page=5" \
  -H "x-api-key: YOUR_API_KEY"
```

```python
import requests

res = requests.get(
    "https://api.onekey.dev/v1/federalregister/latest",
    params={"per_page": "5"},
    headers={"x-api-key": "YOUR_API_KEY"},
)
body = res.json()

if body["success"]:
    print(body["data"])
else:
    print(body["error"]["code"], body["error"]["message"])
```

```javascript
const params = new URLSearchParams({ per_page: "5" });
const res = await fetch(`https://api.onekey.dev/v1/federalregister/latest?${params}`, {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const body = await res.json();

if (body.success) console.log(body.data);
else console.error(body.error.code, body.error.message);
```

## Recorded response

A real Federalregister response, recorded and returned in Onekey's shape. Fields the platform does not provide are `null`.

```json
{
  "success": true,
  "data": [
    {
      "content": {
        "id": "C1-2026-18574",
        "title": "Information Reporting Regarding Qualified Opportunity Zones and Updated Qualified Opportunity Fund Certification and Decertification Procedures",
        "text": null,
        "url": "https://www.federalregister.gov/documents/2026/09/28/C1-2026-18574/information-reporting-regarding-qualified-opportunity-zones-and-updated-qualified-opportunity-fund",
        "createdAt": "2026-09-28T00:00:00Z"
      },
      "entity": {
        "category": "Proposed Rule"
      },
      "author": {
        "displayName": "Treasury Department",
        "username": "treasury-department"
      },
      "media": {
        "url": "https://www.govinfo.gov/content/pkg/FR-2026-09-28/pdf/C1-2026-18574.pdf"
      },
      "ext": {
        "pages": null
      }
    },
    {
      "content": {
        "id": "2026-19843",
        "title": "Notice of Policy Change and Rescission of Single-Pilot Training Exemptions for Certain Cessna Aircraft",
        "text": "Based on safety concerns and a review that revealed widespread non-compliance with the exemptions, the FAA is announcing its decision to cease issuing exemptions that allow certain Cessna aircraft that require two pilots to operate as a single-pilot operation, and notifying current exemption holders that their exemptions will be rescinded by separate action. This notice also serves to inform pilot",
        "url": "https://www.federalregister.gov/documents/2026/09/28/2026-19843/notice-of-policy-change-and-rescission-of-single-pilot-training-exemptions-for-certain-cessna",
        "createdAt": "2026-09-28T00:00:00Z"
      },
      "entity": {
        "category": "Rule"
      },
      "author": {
        "displayName": "Transportation Department",
        "username": "transportation-department"
      },
      "media": {
        "url": "https://www.govinfo.gov/content/pkg/FR-2026-09-28/pdf/2026-19843.pdf"
      },
      "ext": {
        "pages": null
      }
    }
  ],
  "metadata": {
    "platform": "federalregister",
    "endpoint": "latest",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 5,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}
```

## Field mapping

How this endpoint's source fields become Onekey's [unified schema](https://onekey.dev/docs/schema.md). Fields the source lacks come back as `null`.

| Source path | Onekey field | Transform |
| --- | --- | --- |
| `document_number` | `content.id` | - |
| `title` | `content.title` | - |
| `abstract` | `content.text` | - |
| `html_url` | `content.url` | `safeUrl` |
| `publication_date` | `content.createdAt` | `toIsoDate` |
| `type` | `entity.category` | - |
| `agencies.0.name` | `author.displayName` | - |
| `agencies.0.slug` | `author.username` | - |
| `pdf_url` | `media.url` | `safeUrl` |
| `page_length` | `ext.pages` | `toNumber` |

## Caching and freshness

- Fresh for about 2 minutes. Repeat calls in that window are served from cache and are free.
- Between 2 minutes and 15 minutes the cached copy is still served instantly and marked `stale: true` while Onekey refreshes it in the background.
- If the source is down when a refresh is needed, the last copy can be served for up to 1 hour more (marked stale).
- A "not found" is remembered for 1 minute and is free.
- The cache is shared across all customers, which is what keeps repeat calls cheap.

## What can go wrong

| Status | Code | What to do |
| --- | --- | --- |
| 401 | `unauthorized` | Check the `x-api-key` header. |
| 402 | `insufficient_credits` | [Add credits](https://onekey.dev/pricing); your balance must cover the price. |
| 404 | `not_found` | Unknown endpoint path. |
| 422 | `invalid_params` | Fix the parameters using the table above. Free. |
| 429 | `rate_limited` | Wait `Retry-After` seconds, then retry. |
| 502 | `upstream_error` | The source failed. Refunded; retry with backoff. |

See [Errors](https://onekey.dev/docs/errors.md) for the full list and retry guidance.

Status: stable (verified against the live source).