TCGgo exposes lowest_near_mint_FR on its one-piece card endpoint. The same mean/trimmed mean, historical fallback, privacy and quota policies are reusable. Automatic catalogue activation is not safe yet: the audited 13,460 local One Piece entries have zero exact Cardmarket product mappings.

A printed number is not a printing identity. The canonical local OP01-016 row inspected is labelled Nami Manga from PRB-01, with other alternate/promo printings sharing the same printed reference. A local variant: base marker also does not establish that it is the base illustration. Guessing from either field could display the Manga price for an ordinary card, or the reverse.

Before activation, map exact artwork/edition/provider IDs with reviewed evidence, reject collisions and report supported coverage. No 13,460-row guessed mapping or automatic One Piece pricing was published in this delivery.

Separately, CompSniper's public API reference does not document full HTML listing descriptions or a per-item details endpoint. Its extendedTitle characteristics can prove a grade, but are not a guarantee of reading every seller description. The Reptincel 336705059156 regression joins by listing ID and unchanged title, preserving 149 EUR and the original July 25 sale date.

Provider references: https://www.tcggo.com/api-playground and https://api.compsniper.com/docs/api-reference.