TanX.fi Review: Is This Order-Book DEX Worth Using?

TanX.fi is an order-book decentralised exchange aimed at individual traders as well as institutions, OTC desks and exchanges. You can place trades through its app; the homepage shows a limit-order example and promotes instant execution, low slippage and access to liquidity across networks. It also advertises APIs for integrating market data and order creation into other systems.

A notable institutional feature is the option to route trades only to selected or pre-approved counterparties. That could matter if you need controls over whom you trade with, but it is not the same as a general guarantee against fraud or loss. TanX.fi does not publish enough detail about order matching, settlement or available markets to assess those mechanics from its public description alone. Check the live app for the specific pairs, order types and counterparties available to you before funding an account.

TanX.fi advertises no gas fee on trades and describes its execution costs as low, but it does not publish a full fee schedule in its public description. There is no stated maker/taker rate, withdrawal charge or quantified spread to use when comparing it with another exchange. The actual price you receive can also depend on the order book and the size of your order, so a gas-free trade is not automatically a cost-free trade.

Before confirming an order, check its displayed price, total amount and any fee or network charge shown by the app. If you use a bridge or move assets between networks, check those costs separately; TanX.fi says it supports bridging assets across networks but does not give a single published cost for that process. Do not rely on phrases such as “optimum pricing” as a substitute for seeing the final order details.

TanX.fi describes its service as self-custodial, which indicates that users are intended to retain control of their assets rather than hand them to a conventional exchange. That is a useful distinction, but it does not establish how the exchange handles order signing, settlement, smart contracts or any funds temporarily involved in a trade. Those mechanics are not explained in enough detail to assess the risks independently.

No audits are listed, and TanX.fi does not publish a licence or detailed security review in the material describing the product. Its homepage says it is powered by StarkWare, but that alone is not an audit or a guarantee against loss. Treat the self-custody claim as a starting point, not a complete security case: inspect the permissions requested by the app, confirm the transaction details in your wallet, and avoid committing more than you can afford to lose while key security information remains unclear.

TanX.fi's network listings include Ethereum, Arbitrum, Linea, Mode, Polygon, Scroll, Optimism and Starknet. Its homepage specifically features Ethereum, Polygon, Starknet and Arbitrum, so the network list may not tell you which markets or functions are active in the app at a given time. Confirm network support and the exact asset address before transferring anything; tokens with similar names can exist on different chains.

The product is presented as a web app with wallet access and API tools. TanX.fi also mentions Fireblocks accounts, but does not describe wallet compatibility, mobile-app availability, transaction timing or withdrawal processing in detail. That makes it difficult to judge how straightforward the experience will be for a first-time user. If you proceed, connect only through the official TanX.fi app, review every wallet prompt, and first check how to cancel orders and withdraw assets on your chosen network.

TanX.fi's pitch is most specific for traders and organisations that value order-book trading, APIs or the ability to limit counterparties. Its public description is less useful if you want to compare total trading costs, check independent security evidence or understand exactly how assets move through the system. No token is listed, and the product information does not establish whether every advertised feature is available across every network.

The homepage includes an institutional example of KYC-compliant trading with pre-approved partners, but it does not publish a general KYC policy for all users. Check the requirements that apply to your account rather than assuming that the institutional feature defines sign-up rules. TanX.fi also does not publish detailed support, withdrawal or incident-history information in its product description. If those details are essential to your decision, wait until you can verify them directly before trading.