Application to marketplaces and B2B trade

This section is neutral. It applies to any channel that adopts UGP.

14.1 Why

On an anonymised or wholesale channel, buyers cannot price in a seller's reputation, so the grade is the contract. That works only if grades are evidenced, tolerances are defined, and misgrades have consequences.

14.2 Evidence package (V1)

It includes:

• photos per the profile's capture list, on a neutral background, under protocol lighting, with no seller labels, tags or identifying backgrounds, and with EXIF and location data removed;
• a diagnostic report stored by its hash;
• the identity and activation checks, each with its source and timestamp.

14.3 Material misgrade

A unit is materially misgraded if any of these holds:

• (a) at receipt it is one or more rungs below the declared grade on the ladder NS > OB > A > B > C > D;
• (b) it has any fault, crack or triggered liquid indicator, because a graded unit must have none;
• (c) it has an undisclosed encumbrance, lost/stolen report or operator lock;
• (d) its battery is below 80%, or below a measured value that was declared;
• (e) a non-genuine part is undisclosed, or parts declared G/D are not genuine;
• (f) its identity does not match (model, storage, colour, region, IMEI or serial).

A minor variance is a zone over tolerance without a change of grade. Adopters set remedies. The standard recommends a full return for a material misgrade and partial credit for a minor variance.

14.4 Anonymity

In any buyer-facing view:

• grader IDs are pseudonymous;
• no seller identifier appears in records, notes, file names or photos.

14.5 Lot grading

• Preferred: a per-unit record for every device in the lot.
• Permitted: a lot record (record_scope: lot) declaring the grade, or the grade distribution, plus a sampling plan under ISO 2859-1, general inspection level II, with these default AQLs:
  • cosmetic 2.5;
  • functional 1.0;
  • identity and encumbrance 0, so any failure fails the lot.
• The tolerance on a declared distribution is ±5 percentage points per grade.

14.6 Version pinning

• Every offer and every document of sale shall record the UGP version under which the unit was graded.
• Disputes are judged against that version.
• A record is not reinterpreted under a later version, though it may be regraded from its stored raw data and re-issued.

14.7 Grade accuracy score

Adopters should keep, for each seller or facility, the share of units received as described over a trailing 90 days. They may use it to set the required verification tier, sampling rates and payment holds.