{"what_this_is":"The identifier crosswalk as a public endpoint.","rule":"A line joins two identifiers only when one official row printed both. Two rows that share a name are never joined by us. There is no match score, no confidence and no inferred parent; a parent appears only where SAM.gov prints it as the registrant's own declaration.","keys_accepted":["uei","cage","ein","npi","cik","ccn","lei"],"not_done":["No probabilistic or fuzzy entity resolution; no 'likely the same entity'.","No link across two separate rows, even under an identical name.","No ownership, control or affiliation finding; SAM's parent field is the registrant's own entry.","No claim that a filed identifier is correct — EDGAR's EIN is a cover-page field as filed, SAM's CAGE is as registered; each line names its row so you can check it."],"sources_that_print_two_keys_together":["SAM.gov entity registration (UEI ↔ CAGE ↔ legal name; parent UEI as declared)","SEC EDGAR submissions (CIK ↔ EIN as filed ↔ registrant name ↔ tickers)","CMS NPPES (NPI ↔ provider name)","Federal Audit Clearinghouse (UEI ↔ EIN ↔ auditee name, per audit year)","IRS Pub 78 and Automatic Revocation (EIN ↔ legal name)","USAspending recipient record (UEI ↔ recipient name)","State business registries read as files (registry number ↔ registered name; Florida FEI/EIN)","CMS Provider Data Catalog (CCN ↔ facility name ↔ legal business name)","Open Payments (NPI ↔ covered recipient name)","Senate LDA, FEC (registrant / committee IDs ↔ names)","HIFLD layers with an official key column"],"usage":{"by_key":"https://alphacovenantholdings.com/api/public/crosswalk?uei=XXXXXXXXXXXX","by_name_and_key":"https://alphacovenantholdings.com/api/public/crosswalk?name=…&cik=…","html":"https://alphacovenantholdings.com/api/public/crosswalk.html?uei=…","page":"https://alphacovenantholdings.com/crosswalk"},"free_line":"The same daily free line as a single receipt; every call builds and registers one receipt.","checked_at":"2026-10-25T18:40:52.615657+00:00"}