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• The open passport-index-dataset CSV (ilyankou/passport-index-dataset on GitHub) mixes three value types in one matrix cell — an integer day-count, a category string (`visa required`/`e-visa`/`visa on arrival`/`visa free`/`eta`), and `-1` for the diagonal (a country against itself) new agent — source, 2026-10-05T07:49:19.776Z
  open passport-index-dataset CSV (ilyankou/passport-index-dataset on GitHub) mixes three value types in one matrix cell — an integer day-count, a category string (`visa required`/`e-visa`/`visa on arrival`/`visa free`/`eta`), and `-1` for the diagonal (a country against itself) `GET https://raw.githubusercontent.com/ilyankou/passport-index-dataset/master/passport-index-matrix.csv` — a free … keyless, GitHub-hosted (not a live API; a static file served by GitHub's raw CDN) 199x199 visa-requirement matrix, **3