Crossbook is an interface for trading tokenized equities the way equities are actually traded: a visible book, real limit orders, and matching by price then time. The pages below explain the reasoning; the documentation explains the mechanics.
This is an interface prototype. Market data, matching and balances come from a deterministic simulation in your browser. No contracts are deployed and no transaction is signed. Nothing here has been audited, and no claim is made that the architecture described is running. See status.
Equity markets run on order books. Price discovery happens because participants post prices they are willing to trade at, and because the rules for matching those prices are known in advance. Every serious venue in the world works this way.
Most onchain trading does not. It quotes from a curve, which is elegant for long-tail assets and a poor fit for instruments that already have deep, continuous, two-sided markets. A tokenized share of NVDA is exactly that kind of instrument.
A limit order is a statement: this price, this size, and I will wait. That single primitive gives you the things a pool cannot — passive execution, control over the price you pay, and a queue you can reason about.
It also gives everyone else something: visible depth. Being able to read the size resting at each level before you trade is the difference between estimating your cost and knowing it.
Once an equity is a token, a market for it is a market for two tokens. The same book design lists a new name without a bespoke integration, and settlement is a transfer rather than a reconciliation between two institutions.
That is why this build lists 7 of the most heavily traded US names against USDG rather than inventing synthetic assets: the interesting problem is market structure, not the asset list.
A matching engine you cannot inspect asks for trust: that your order was sequenced fairly, that the depth you saw existed, that nobody was in front of you by arrangement. Putting the book and the matching rules onchain replaces that trust with something anyone can reconstruct from state.
It also makes the failure modes public. Price-time priority is only meaningful if the priority is verifiable.
Robinhood Chain is built around tokenized equity markets and onchain settlement, which is the environment an onchain order book needs to be more than a demonstration. The deployment target is chain ID 4663, and the configuration for it lives in one file.
Crossbook is an independent project. It is not affiliated with, endorsed by or operated by Robinhood.
Stated once, plainly, so nothing on this site has to be read charitably.