TCG Marketplace Listings API

Programmatic access to the Collector Stash Market marketplace — create, update and search seller listings, integrate POS sales flow, sync inventory.

Public buy/sell flow opens 1 August 2026. Listing endpoints are live for authenticated sellers today; the public buy-now / bid surface is gated until launch.

List my listings

GET https://collectorstashmarket.com/seller/listings

Browse a seller / a card

GET /seller/listings/public/{username}
GET /seller/listings/card/{card_id}
GET /seller/listings/{listing_id}/detail

Create a listing

POST /seller/listings
Content-Type: application/json
Authorization: Bearer csm_your_key_here

{
  "card_id": 12345,
  "variant": "foil",
  "condition": "NM",
  "price_eur": 19.50,
  "quantity": 1,
  "photos": ["url1", "url2"]
}

Update / delete

PATCH  /seller/listings/{listing_id}
DELETE /seller/listings/{listing_id}

Marketplace helpers

GET  /api/listings/fee-preview?price_eur=42
GET  /api/listings/price-advice?card_id=12345&variant=normal&condition=NM
POST /api/listings/quality-score        (multipart photo upload)
POST /api/listings/fraud-check
POST /api/listings/{listing_id}/buy-now
POST /api/listings/{listing_id}/renew
GET  /api/listings/{listing_id}/quality-score

Verification

Listings auto-run our photo-quality + fake-detection module. Listings with quality ≥ 0.7 receive a verified-photo badge.