DEXes · Review
ActiveOpenBook Review 2026: Solana Order-Book DEX
OpenBook is a Solana decentralized exchange built around an on-chain order book and forked from Serum V3. It offers a composable trading program, but fees, audits, and the official user interface are unclear.
By the DappsAtlas editorial team · Updated
DappsAtlas score
5.0/10
Mixed
Our verdict on OpenBook
5.0/10OpenBook may suit Solana developers and traders who want an on-chain order book and are comfortable using a compatible third-party interface. Its main strength is its role as composable exchange infrastructure built around the Serum V3 model. The main caveats are substantial: fee details and an official trading interface are unclear, no audit is listed, and liquidity can vary from market to market. Treat it as a protocol to verify carefully, not a turnkey exchange with established consumer protections.
Score breakdown
How OpenBook scores
- Security
- n/a
- Ease of use
- n/a
- Fees
- n/a
- Features
- 5.0/10
Scores run from 0 to 10 and are based only on facts we could verify. Where information was missing we mark the score n/a rather than guess.
What is OpenBook?
OpenBook is a decentralized exchange program on Solana that uses a central limit order book. It is a community-led fork of Serum V3, the order-book program associated with the earlier Serum project.
Rather than offering a single standalone trading destination, OpenBook is described as infrastructure for developers building DeFi applications. Traders need an interface that supports OpenBook markets and a compatible Solana wallet. Fee details and an official trading interface are not established here, and no audit is listed.
How OpenBook works
OpenBook is a central limit order book (CLOB) program on Solana. Instead of relying solely on a pool of assets priced by an automated formula, a CLOB records buy orders (bids) and sell orders (asks) at chosen prices. Orders can match when a buyer’s bid meets a seller’s ask; an order may fill fully, fill partly, or remain open if there is no matching counter-order.
OpenBook is a community-led fork of Serum V3 and is presented as infrastructure that other DeFi applications can build on. Users typically access its markets through a compatible interface and wallet. The program’s on-chain design does not remove the risks of low liquidity, poor execution, incorrect interfaces, or smart-contract faults.
4 features
Key features
01
Order-book trading
OpenBook uses a central limit order book, where buy and sell orders are posted at specified prices and can match when their terms cross.
02
Solana markets
The exchange program runs on Solana, where users and applications interact with its markets through compatible wallets and interfaces.
03
Serum V3 fork
OpenBook is a community-led fork of the Serum V3 program, continuing the on-chain order-book model.
04
Composable infrastructure
OpenBook is described as infrastructure for developers building DeFi applications, rather than only as a standalone trading site.
Pros and cons
What we like
- Uses an on-chain order-book model familiar to traders of traditional exchanges.
- Runs on Solana and can be accessed by compatible applications.
- Designed as infrastructure that developers can integrate into DeFi products.
- Continues the Serum V3 order-book approach as a community-led fork.
Watch out for
- OpenBook does not publish fee details.
- No audit is listed, leaving the program’s security review unclear.
- Trading depends on liquidity in each order book; thin markets can mean wider spreads or difficulty filling orders.
- There is no established official trading interface in the project information, so users need to check that a third-party interface supports OpenBook and is trustworthy.
OpenBook fees
OpenBook does not publish fee details in the project information here. Before trading, check the interface for any protocol, market, or service fees and review the Solana transaction costs shown in your wallet.
Is OpenBook safe?
OpenBook runs as a Solana program, but on-chain execution does not eliminate smart-contract, wallet, transaction, or market-liquidity risks. No audit is listed, and details about the program’s security review and custody arrangements are not published here. Verify the market and the interface you use before signing transactions.
OpenBook’s regulatory status is not stated. Check the laws that apply where you live and use only amounts you can afford to lose.
5 steps
How to get started with OpenBook
- 1
Choose a Solana wallet and make sure it holds the assets needed for your intended market and network transactions.
- 2
Find a trading interface that explicitly supports OpenBook markets; confirm that it is the interface you intend to use.
- 3
Connect your wallet and review the market’s assets, order book, and available liquidity.
- 4
Check any interface charges and the transaction details shown in your wallet.
- 5
Place an order only after confirming its price, size, and terms, then monitor its status in the interface.
Who OpenBook is for
OpenBook is best suited to developers exploring Solana trading infrastructure and experienced users who understand order books, wallet approvals, and the risks of third-party interfaces. Newer traders may find a standalone exchange with clear fees, interface support, and security disclosures easier to assess.
OpenBook FAQs
What is OpenBook?
OpenBook is a decentralized exchange program on Solana that uses a central limit order book. It is a community-led fork of Serum V3 and can serve as infrastructure for trading applications.
How do I use OpenBook?
OpenBook uses Solana, so a compatible Solana wallet and SOL for network transactions are generally needed. You will also need an interface that supports the particular OpenBook market you want to trade.
What fees does OpenBook charge?
OpenBook’s fees are not published in the project information here. Check the trading interface and transaction details before placing an order, since an interface may also charge its own fees.
Is OpenBook safe?
No audit is listed for OpenBook. On-chain trading still carries program, wallet, liquidity, and transaction risks, so verify the interface and market before using the protocol.
Does OpenBook have a token?
No OpenBook token is identified. The project is described as a trading program rather than a token-based exchange.
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Guides
Guides that mention OpenBook
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How we checked
Sources
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