SEC, Treasury & Agent Utilities

Every SEC filing by one issuer SINCE a cursor - a delta, not a dump. Requires ?since=YYYY-MM-DD AND ?ticker= or ?cik= (cik wins if both). Optional ?forms=10-K,8-K (also matches /A), ?limit=1..200. Errors: 400 missing_since|missing_issuer|bad_since|bad_ticker|bad_cik|bad_limit, 404 unknown_ticker|unknown_cik, 502 edgar_unavailable, 503 rate_limited_locally. AN EMPTY DELTA IS CHARGED: nothing-change

US Treasury par yield curve, every constant maturity from 1 month to 30 years for a published business day. Returns curve[] with tenor, months and percent, spreads (2s10s, 3m10y, 5s30s) and an explicit inversion flag - the real question is whether the curve is inverted, not what fourteen numbers are. A tenor Treasury did not publish is null, never zero. Pass ?latest=1 OR ?date=YYYY-MM-DD, not both

Legal Entity Identifier lookup from the GLEIF golden copy, searchable by NAME - knowing the LEI already is the hard part. Returns records[] with lei, legalName, status, jurisdiction, legalAddress and a lapsed flag; LAPSED and RETIRED entities are returned, not hidden - a filtered record and no record look identical. Requires ?q=<legal name, max 200> or ?lei=<20 chars>. Errors: 400 missing_query|ba

Ownership changes for one issuer SINCE a cursor: Forms 3/4/5 (Section 16 officers, directors) and Schedules 13D/13G (5%+ holders), amendments included. Returns the FILING-level change and its document URL; share counts inside each Form 4 are NOT parsed and not claimed. Requires ?since=YYYY-MM-DD AND ?ticker= or ?cik=. Optional ?forms=4, ?limit=1..200. Errors: 400 missing_since|missing_issuer, 404

Form 8-K material events for one issuer SINCE a cursor, each item code decoded to the title SEC prints (2.02 Results of Operations, 5.02 Departure of Directors, 1.05 Cybersecurity Incidents). Requires ?since=YYYY-MM-DD AND ?ticker= or ?cik=. Optional ?items=1.01,5.02 (matches ANY), ?limit=1..200. Errors: 400 missing_since|missing_issuer|bad_items, 404 unknown_ticker|unknown_cik, 502 edgar_unavaila