NEXUS Economy is a complete, auditable game economy: wallets that never drift (64-bit integer money priced in basis points), vendors with supply-driven elastic pricing, an append-only transaction ledger where every movement carries an idempotency key (replays cannot commit), a SHA-256 hash chain you can verify with one call, and an auction house with escrowed bids, outbid refunds, market fees, and high-value tax.

- Zero class-level statics: many independent economies per process, Enter Play Mode Options safe (domain reload disabled)

- Pure domain assembly: Runtime/Domain references no engine types

- One-call whole-economy snapshots (CaptureState / RestoreState) for any save layer; pairs with NEXUS Persistence and NEXUS Inventory

- Ledger Inspector: audit rows, verify the chain, export JSON

- One-scene uGUI showcase: buy, sell, auction, settle - with live ledger log

- 50 EditMode tests; docs set (9 files) with manual, API reference, FAQ

Supported Unity: 2021.3 LTS and newer (compile floor tested). Price integrity: bundle math 69 + 59 + 69 = 197 USD vs Starter bundle 119 USD.