Proposed/final rules and notices from a federal agency — the regulatory pipeline that reprices sectors. Pass `?agency=securities-and-exchange-commission` (slug) and/or `?q=` (at least one), plus `?type=all|rule|proposed|notice` and `?limit=` (max 100). Each doc has number, type, title, abstract, dates, agencies, and a link. From x402stock, a market & economic data API (x402, USDC).