Paid services on Base matching “token overlap”

Tokenizes each claim and its supplied evidence, removes a small declared English stop-word list, and reports the fraction of unique claim tokens present in evidence. Coverage below a supplied threshold is flagged. This is lexical grounding screening only: overlap does not prove truth, low overlap does not prove hallucination, and the service does not retrieve or validate evidence.

Normalize URL strings for link deduplication and stable hashing without network access. Deterministic URL normalization using Python urllib.parse: strip surrounding whitespace, require parsed http/https scheme and nonempty authority, lowercase scheme and the entire authority (including any userinfo), use / for an empty path, remove the final path-parameter component and fragment. Decode/re-encode