EVE Arbitrage

Find inter-region hauling arbitrage in EVE Online: buy cheap from the lowest sell orders in one trade hub, haul it, and fill the highest buy orders in another. Opportunities are ranked by realistic profit per trip given your ship's cargo (m³) and ISK budget. Filling an existing buy order costs sales tax only — no broker fee.

Live: https://eve-arbitrage-six.vercel.app

Two-stage scan for speed and accuracy:

1. Discovery — Fuzzwork station aggregates (cached ~30 min) cheaply shortlist candidate items with a margin between hubs.
2. Exact depth-walk — for each candidate, the real ESI order books are walked (buy the cheapest station sell orders, fill the highest reachable buy orders), honoring cargo, capital, order-book depth, min-volume, and buy-order range. The scan's numbers therefore equal the per-item drill-down exactly.

Item names and volumes come from the EVE SDE (Fuzzwork invTypes dump), generated into data/types.json at prebuild.

salesTax   = 0.075 - 0.009 * AccountingLevel        (fill = tax only, no broker fee)
unitMargin = sellPrice * (1 - salesTax) - buyPrice
tripUnits  = min(cargo / volume, budget / buyPrice, fillable order depth)
tripProfit = sum over the walked order book, net of tax

The 5 hubs: Jita (The Forge), Amarr (Domain), Dodixie (Sinq Laison), Rens (Heimatar), Hek (Metropolis).

npm install
npm run dev            # prebuild downloads the SDE -> data/types.json
npm test               # vitest (offline, mocked)
npm run e2e            # playwright
npm run build

Set ESI_CONTACT (your email) so outbound requests carry a descriptive User-Agent, per ESI etiquette.

Next.js 16 (App Router) · React 19 · TypeScript · Tailwind v4 · Vercel. No database — live market data is fetched and cached in-process; only the SDE item table is static.

Logging in with your EVE character auto-fills your exact sales tax (from the Accounting skill) and budget (from your wallet). Without it, the tool works anonymously with a manual Accounting-level selector.

Setup (see .env.example): register an app at https://developers.eveonline.com/ with callback <site>/api/auth/callback and scopes esi-skills.read_skills.v1, esi-wallet.read_character_wallet.v1, then set the env vars.