Check the spec linked in the nip above: https://github.com/GammaMarkets/market-spec/blob/main/spec.md
Section 5 is reviews
5. Product Reviews (Kind: 31555)
Product reviews follow NIP-85 and QTS guidelines with additional marketplace-specific rating criteria. Reviews provide structured feedback about products, merchants, and the overall purchase experience.
Content: Detailed review text
Required tags:
d: Reference to product ["d", "a:30402:
rating: Primary rating ["rating", "
score: 0 (negative) to 1 (positive)
"thumb" label MUST be present as primary rating
Optional tags:
Additional Ratings:
rating: Category scores ["rating", "
score: 0 to 1 (supports fractional values)
category: These are optional, some standard categories may include:
"value": Price vs quality
"quality": Product quality
"delivery": Shipping experience
"communication": Merchant responsiveness
{
"kind": 31555,
"created_at":
"tags": [
// Required tags
["d", "a:30402:
["rating", "1", "thumb"], // Primary rating
// Optional rating categories
["rating", "0.8", "value"],
["rating", "1.0", "quality"],
["rating", "0.6", "delivery"],
["rating", "0.9", "communication"]
],
"content": "Detailed review text"
}