Сфоткал коллекцию — приложение само отметило версии. Свапаешься с другим фанатом — escrow гарантирует, что не обманут.

Source signals

• SIG-20260426-sea-mainland-hobbyist-utility-th-kpop-photocard-collection: «I want to start collecting BTS photocards — what should I start with?»
• SIG-20260426-sea-mainland-hobbyist-utility-th-photocard-trade-scam-protection: «If you get scammed, is there...?»
• SIG-20260426-sea-mainland-hobbyist-utility-th-photocard-binder-supplies: «Walked around B2S — totally plain, ugly designs»
• SIG-20260426-sea-mainland-hobbyist-utility-th-kpop-fanmeet-logistics: «Each promoter has its own ticketing site/membership»

What we ship

**Core features (MVP)**

• Collection tracker: photo each card → auto-detect group/member/version (album A/B/C, POB, Lucky Draw, fansign)
• Wishlist: "need 5 more cards from this album"
• Trade-coordinator with PromptPay escrow: buyer pays → funds on hold → seller submits ship-photo-proof → buyer confirms receipt → funds released. 3% commission.
• Reputation system: rating per successful trade, "verified seller" badge after 5 transactions
• Pop-up shop reminder: "Tomorrow: NewJeans pop-up at Siam Square (10:00-22:00)"

**Primary user flow**

1. LINE/Twitter Login → upload photos of existing collection (auto-detect versions)

2. Set wishlist → match with users having needed cards

3. Initiate swap → escrow hold → photo-proof → release

4. Pro upgrade at 50+ cards or first trade

**What it looks like**

• **Landing**: hero "สะสม การ์ด K-pop ของคุณ — ปลอดภัย ไม่โดนโกง" + verified-trade flow examples + screenshots gallery
• **Main app screen**: grid of all cards with group/member filters + active trades sidebar
• **Trade screen**: flow timeline (paid → ship → received), photo proofs

**MVP build plan (14 days)**

• Day 1-3: backend (Card/Wishlist/Trade models), R2 photo upload
• Day 4-7: card-detection LLM (prompt + seed top-50 K-pop groups), wishlist matching
• Day 8-11: PromptPay escrow flow + Stripe Connect, reputation rating
• Day 12-14: pop-up shop calendar, landing, Twitter ad campaign, deploy

Reasoning

Pantip topics 41122341 ("where to start"), 41395222 ("starting too"), 35042291 (binders), 38086031 (fanmeet logistics) reveal the full funnel: beginner → collector → trader. SIG-th-photocard-trade-scam-protection explicitly cites scam fear as recurring pain. Global KollectPop exists but lacks PromptPay escrow + TH locale. 500K+ TH K-pop fans spend 1-10K THB/mo — 3% trade commission covers unit economics. Stack ideal: Cloudflare PWA + Railway + Stripe Connect + PromptPay. **medium competitive pressure** — KollectPop exists but doesn't cover escrow + TH locale.

Quick competitive read

• **KollectPop** — global K-pop collection tracker, English-first, no escrow, no TH PromptPay. ~100K+ users.
• **Pop Album** — wishlist-only, web app.
• **Twitter/X DMs + FB Marketplace** — current trade "channel", no escrow, recurring scams.
• **white space in TH segment**: TH-locale + PromptPay escrow + reputation + pop-up shop calendar. Competitors with traction = 0-1.

Initial pricing hypothesis

Free — up to 100 cards, 3 active trades/mo. Pro — 99 THB/mo or 990 THB/year for unlimited collection + unlimited trades + priority in trade marketplace. Trade commission 3% (escrow service). Premium tier for dealers — 299 THB/mo with storefront + verified badge. Pricing fits TH youth cohort.

Distribution hypothesis

1) Twitter/X campaign on TH-K-pop keywords ("#kpopthailand", "#kpoptradeth", #ส่งต่อการ์ด); 2) Pantip reply on topics 41122341, 41395222; 3) Instagram K-pop influencers (50-200K followers, woman-cohort); 4) Bangkok pop-up shop partnerships (NewJeans Siam Square — distribute QR); 5) TikTok shorts "how to avoid swap scams" with soft CTA.