A derivatives-focused open-source perp DEX reference on Arc, published at github.com/JagritGumber/arc-perp-reference (MIT, project name Tangent). It ships three source-verified contracts live on Arc Testnet (AccountManager, USDCVault, MarketRegistry) with a proof-of-life registerAccount() tx, ~50 Foundry tests plus invariant fuzzing, green CI, three ADRs, and a 53KB architecture doc. Reusable primitives include permissionless EOA account registration without custody binding, a per-account USDC vault with margin hooks, an admin-curated market registry with a pluggable IPriceFeed oracle adapter, a canonical EIP-712 "Tangent v1" Order schema with frozen typehash, and a batched end-of-block settlement pattern. A Rust tangent-sdk crate provides the canonical EIP-712 Order types.
1 (Solo) — Jagrit Gumber