Field Reference

Domain object

The domain field carries item-type-specific attributes. It uses a tagged union — the domain property inside the object determines the type.

---

Automotive parts

Use "domain": "automotive_part" for spare parts, body panels, engines, gearboxes, etc.

{
  "domain": {
    "domain": "automotive_part",
    "oemCode": "31400452",
    "manufacturer": "Volvo",
    "compatibleModels": ["XC90", "XC90 II"],
    "donorVehicleYear": 2018,
    "conditionGrade": "B"
  }
}

Field	Type	Description
oemCode	string	OEM part number. Required for automotive parts. Shown in the Tradera ad.
manufacturer	string	Vehicle manufacturer (e.g. Volvo, BMW, Scania).
compatibleModels	string[]	List of compatible model names.
donorVehicleYear	integer	Model year of the donor vehicle.
conditionGrade	string	Condition rating. Rheo accepts any string; recommended values below.

Condition grades

Grade	Meaning
A*	New old stock or unused
A	Excellent — minimal wear, fully functional
B	Good — normal wear, fully functional
C	Fair — visible wear or minor damage, functional

These grades are displayed verbatim in the Tradera ad description.

---

Electronics

{
  "domain": {
    "domain": "electronics",
    "serialNumber": "SN123456",
    "memoryGb": 256,
    "batteryHealthPercentage": 88
  }
}

Field	Type	Description
serialNumber	string	Device serial number.
memoryGb	integer	Storage capacity in GB.
batteryHealthPercentage	integer	Battery health (0–100).

---

Fashion

{
  "domain": {
    "domain": "fashion",
    "size": "M",
    "material": "Cotton",
    "gender": "unisex"
  }
}

Field	Type	Description
size	string	Size label (e.g. M, 42, UK 8).
material	string	Primary material.
gender	string	mens, womens, or unisex.

---

Generic items

Omit the domain field entirely, or use "domain": "generic", for items that do not fit the above categories.

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How domain data appears in Tradera ads

Rheo appends a structured section at the end of the Tradera ad description:

--- Technical Specification ---
OEM: 31400452
Condition: B
Compatible with: Volvo XC90 (2018)

This section is generated automatically from the domain fields you provide. The higher the quality of the data you send, the better the ad performs in Tradera search.