Why not just use TED or the free national portals?

Because they are single-source, single-language and unranked.

TED carries only above-threshold EU contracts, so below-threshold work published on national systems never appears there, and no official portal scores a notice against what your company makes. Watching ten portals by hand is a job, not a tab. TRINTA reads those same official sources, 1360+ of them daily, and returns a ranked shortlist instead of a chronological list.