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Federal Register Search API (x402)
x402
Federal Register Search API (x402) is a paid API for AI agents from x402-data-api-x6da.onrender.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Search and retrieve federal government documents from the Federal Register, including rules, proposed rules, notices, and presidential documents, filtered by agency, keyword, and date range.
Price / call$0.02
Success—
StatusUnknown
How this service works
Jobs from company ATS boards, SEC EDGAR full-text search, domain RDAP/DNS, NHTSA VIN decode + recalls, the CMS NPI Registry and MET Norway weather forecasts. Pay per call in USDC on Solana via x402. Official public sources only.
Output
Returns a list of matching Federal Register documents including metadata such as document type (RULE, PRORULE, NOTICE, PRESDOCU), publishing agency, title, date, abstract, and links to the full text on federalregister.gov.
Example use cases
Track new EPA environmental rules
“Find any rules or proposed rules published by the environmental-protection-agency in the Federal Register since January 1 2025 related to emissions — show me up to 20 results.”
Monitor FDA food safety notices
“Search the Federal Register for NOTICE documents from the food-and-drug-administration about food safety between March 1 2024 and March 31 2024, limit to 15 results.”
Research financial regulatory rulemaking
“Look up proposed rules in the Federal Register mentioning 'cryptocurrency' or 'digital assets' from any agency between 2023-01-01 and 2024-12-31, give me up to 10 results.”
Technical details
Endpoint
GEThttps://x402-data-api-x6da.onrender.com/v1/gov/federal-register?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to search official U.S. federal regulatory documents from the Federal Register by keyword, agency, document type, or date range. It is ideal for compliance monitoring, regulatory research, and policy tracking workflows where authoritative government source data is required. Prefer this over web search when you need structured, filterable access to federal rulemaking and notices.
Side effects
- No results returned if query terms do not match any documents in the date range
- Invalid agency slug returns an error or empty result set
- Unsupported document type enum value returns a validation error
- Date format errors if date_from or date_to are not properly formatted
- Payment failure if USDC balance is insufficient for x402 micropayment
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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