BlackMarkety

We built BlackMarkety as a Go API with a TanStack Start web app, background workers that collect the game data around the clock, and a back office for the team.

• Market — prices for every city on the Asia, Europe and Americas servers, from both periodic snapshots and a live order feed. Items nobody is selling get a clearly labelled estimate from their crafting cost, another server or a neighbouring tier.
• Demand — a collector reads the kill feed every 30 seconds and rolls up what players lose each hour. That produces the most-replaced gear, the guilds that die most and what they wear, when deaths peak, and ranked "what to sell now" suggestions.
• Player tools — a trade ledger for profit tracking, a loadout builder, regear costing for guild battles, and crafting calculators.
• Accounts and billing — Ory Kratos sign-in with email and password, passkeys or Google, and Stripe subscriptions. Plans, prices and which features each plan unlocks are managed in the back office.
• Back office — users and subscriptions, plan editing, worker monitoring, an audit log of admin actions, and first-party usage analytics showing which pages and features people use.
• Performance — a Redis cache with a background sync that precomputes demand for every server and time range. Pages open with stored data instead of waiting for upstream APIs, and public data is cached at Cloudflare's edge.