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Federal Register Search API
x402
Federal Register Search API is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Search and retrieve U.S. Federal Register documents including rules, notices, and proposed rules, filtered by keyword query
Price / call$0.002
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
Returns a JSON object with the total count of matching documents, the number returned, the search query used, and an array of result objects each containing document type, title, agency name, abstract, Federal Register citation (e.g. '88 FR 12345'), and publication date.
Example use cases
Regulatory compliance research
“Find me the latest Federal Register rules and notices about cryptocurrency regulation — I need the titles, agencies, and FR citation numbers so I can check what's been published recently.”
Legal research on bankruptcy rules
“Search the Federal Register for documents about bankruptcy — I want the most recent rules with their abstracts and publication dates for a legal brief I'm putting together.”
Environmental policy monitoring
“Pull up Federal Register entries related to 'clean air' so I can see which agencies have published rules or proposed rules on that topic and what their FR citations are.”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/federal-register?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to search U.S. Federal Register documents by keyword to find rules, proposed rules, or notices from federal agencies. Prefer this over general web search when you need structured regulatory data with official FR citations, agency attribution, and publication dates — especially for legal research, compliance monitoring, or policy analysis.
Side effects
- Missing or empty query parameter returns error or empty results
- Query too broad may return thousands of results with limited pagination
- Federal Register API downtime causes upstream failure
- No results found for highly specific or misspelled queries
- Rate limiting or payment failure if USDC balance insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"n": 3,
"count": 6225,
"query": "bankruptcy",
"results": [
{
"type": "Rule",
"title": "...",
"agency": "...",
"abstract": "...",
"citation": "88 FR 12345",
"publication_date": "2026-10-01"
}
]
}
}Tags
x402
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