A: official public docs, developer portal, API reference, OpenAPI/Postman, SDK, or strong government source.B: official source exists, but coverage is partial or maturity needs review.C: a source lead exists, but public API evidence is missing, gated, or ambiguous.unknown: not enough public evidence.
high: public source or completed review supports the scoped claim.medium: source-backed signal exists, but it is partial or needs operator interpretation.low: useful hypothesis, planning lead, or unvalidated operator note.
- High-confidence regional claims need
source_urlsor review evidence. - Country-level statistics are context signals, not individual behavior proof.
- Industry reports are medium-confidence unless they are narrow, recent, and directly relevant.
- Pricing, legal, tax, religious, identity, public-sector, or regulated claims need expert review when no official source is attached.