# US Federal Register — Rules and Notices Search

> US Federal Register — Rules and Notices Search is a paid API for AI agents from x402-filings.datalayer.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Search proposed rules, final rules, notices, and presidential documents in the US Federal Register by keyword, agency, document type, and date, returning abstracts, effective dates, and comment period deadlines.

## Facts

- Endpoint: GET https://x402-filings.datalayer.workers.dev/v1/gov/federal-register?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/us-federal-register-rules-and-notices-search-7803c97c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ky-DjcHUQ0mTBmfxKlprH

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 us-federal-register-rules-and-notices-search-7803c97c
```

Example prompt: Search the Federal Register for proposed rules about tariffs published since January 2025, and tell me which ones are still open for public comment — show me up to 20 results with their comment deadlines.

## When to prefer this

Use this endpoint when you need to search or monitor US federal regulatory activity — proposed rules, final rules, notices, or presidential documents — especially when you care about comment period deadlines and open-for-comment status. Prefer this over manual Federal Register browsing or generic web search when you need structured, filterable regulatory data including effective dates and agency attribution. It is ideal for compliance monitoring, lobbying research, public interest advocacy, and tracking regulatory changes by agency or topic.

## Known failure modes

- Missing both q and agency parameters — at least one is required
- Invalid date format — must be ISO date (YYYY-MM-DD)
- Invalid document type value — must be one of: rule, proposed, notice, presidential
- Limit out of range — must be between 1 and 100
- No results found for the given search criteria — returns empty result set
- Upstream Federal Register API unavailable — may return 5xx error
- Payment not fulfilled — x402 payment required before response is returned

## How this service works

Search the US Federal Register: proposed rules, final rules, notices and presidential documents, by term, agency, document type and date. Returns the abstract, the issuing agencies, the effective date and — the field that actually matters if you want to influence a rule — the date the comment period closes, with a count of how many results are still open for comment.

## Output

Returns a list of Federal Register documents matching the query, each with the document title, abstract, issuing agency or agencies, document type (rule, proposed rule, notice, or presidential document), publication date, effective date, comment period close date, and a count of results still open for public comment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "q": {
       "type": "string",
       "examples": [
        "tariff"
       ],
       "description": "Search term. Either q or agency is required."
      },
      "to": {
       "type": "string",
       "examples": [
        "2026-08-24"
       ],
       "description": "Published on or before, ISO date."
      },
      "from": {
       "type": "string",
       "examples": [
        "2026-01-01"
       ],
       "description": "Published on or after, ISO date."
      },
      "type": {
       "type": "string",
       "examples": [
        "proposed"
       ],
       "description": "One of rule, proposed, notice, presidential."
      },
      "limit": {
       "type": "integer",
       "examples": [
        20
       ],
       "description": "Max documents, 1-100. Default 20."
      },
      "agency": {
       "type": "string",
       "examples": [
        "environmental-protection-agency"
       ],
       "description": "Agency slug, e.g. environmental-protection-agency."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/us-federal-register-rules-and-notices-search-7803c97c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-filings.datalayer.workers.dev](https://www.zero.xyz/host/x402-filings.datalayer.workers.dev/llms.txt)