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TanX.fi Review 2026: Gasless Order-Book DEX for Institutions

TanX.fi is a self-custodial, gasless order-book exchange, powered by StarkWare, that targets traders, OTC desks and institutions. Its on-chain TVL is small and no audits are listed.

By the DappsAtlas editorial team · Updated Nov 4, 2026

DappsAtlas score

5.5/10

Mixed

Visit TanX.fi

Our verdict on TanX.fi

5.5/10

TanX.fi suits institutions, OTC desks and experienced traders who want a self-custodial order-book exchange with API access and the option to trade only with known counterparties. Its main strength is that institutional focus, along with advertised gasless trading. The main caveat is thin public evidence: TVL is only about $260K, DefiLlama lists no audits, and fees are not shown publicly. Check the pricing, docs and any audits before committing funds.

Score breakdown

How TanX.fi scores

Security: 5.0/10
Ease of use: 6.0/10
Fees: n/a
Features: 6.5/10

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 TanX.fi?

TanX.fi is a decentralized exchange that uses an order book. DefiLlama describes it as built for traders by traders, with gasless, instant, multi-chain and trustless trading, powered by StarkWare. It has been listed since 31 July 2023.

The homepage positions it as an institutional DEX with self-custody, offering a route to trade only with known counterparties, API access and Fireblocks support. It claims backing from 30+ global partners, but public sources name none.

DefiLlama shows about $259,738 TVL across Ethereum, Arbitrum, Linea, Mode, Polygon, Scroll and Optimism, with a 3.2% fall in the past week. That is small for a DEX, though TVL is only a partial gauge for an order-book venue.

How TanX.fi works

TanX.fi runs an order book, where buyers post bids and sellers post asks, and trades happen when prices meet. This differs from pool-based DEXs, where users trade against a liquidity pool at a formula-set price. Order books can give tighter spreads when there are enough market makers.

The project says it is powered by StarkWare, a zero-knowledge scaling technology, and that trades are gasless, instant and self-custodial. The homepage says users keep custody of their assets while trading. The project does not describe the settlement design in more detail.

A distinctive feature is counterparty selection. Traders can choose to route orders only to known, pre-approved parties, which the site presents as a compliance tool for banks, brokers and OTC desks. An API lets firms place orders and pull market data programmatically.

7 features

Key features

Order-book trading

Trades are matched against an order book with limit orders instead of an automated market maker pool. The homepage shows an ETH/USDC market with order creation.

Gasless execution

The site states users pay no gas on trades. The exact mechanism is not described in the text provided.

Known-counterparty routing

Users can choose to trade only with pre-approved entities, with the homepage showing a KYC on/off toggle and institution scores.

Multi-chain access

The homepage lists Ethereum, Polygon, Starknet and Arbitrum, and says users can bridge assets across supported networks. DefiLlama also lists Linea, Mode, Scroll and Optimism.

Trading APIs

The site advertises developer-friendly APIs, low-latency market data endpoints and free internal transfers described as exclusive to its API docs.

Fireblocks and wallet support

The homepage says users can trade from a Fireblocks account or any wallet while keeping custody of their assets.

Leaderboard and referrals

The app navigation shows a leaderboard and referral links with affiliate options.

Pros and cons

What we like

Order-book model with limit orders suits traders who want price control.
Self-custody is stated, with support for Fireblocks accounts and other wallets.
Optional routing to known counterparties may suit compliance-minded desks.
Gasless trading is advertised, and APIs and low-latency data are offered.
Wide chain coverage across several Ethereum layers per DefiLlama.

Watch out for

On-chain TVL is small, about $260K, which suggests limited liquidity depth compared with large DEXs.
DefiLlama lists no audits, and its homepage provided does not name any security reviewer.
Fee levels are not shown; users must check the pricing page.
Marketing claims such as 'world's leading institutional DEX' and '30+ global partners' are not backed by named evidence.
The product is aimed at institutions, so retail traders may find fewer public features and less documentation aimed at them.
TVL fell 3.2% over seven days, and public sources give no trading volume to show actual usage.

TanX.fi fees

TanX.fi's homepage says there is no gas fee on trades and advertises tight bid-ask spreads and low execution cost. It does not state trading fee rates in the text reviewed.

The site has a Pricing page in its navigation, which is where users should check maker and taker fees, any API pricing, and whether institutional tiers differ. Network fees for deposits, withdrawals and bridging may still apply on the underlying chains, and the project does not detail them.

Is TanX.fi safe?

DefiLlama lists zero audits for TanX.fi, and its homepage provided does not cite any. Readers should look for audit reports in the official docs before depositing meaningful funds. The self-custodial claim reduces counterparty risk compared with a centralized exchange, but smart-contract, bridge and operator risks remain.

The site markets compliance features such as KYC-compliant trades with pre-approved partners, but no licenses or regulatory registrations are stated publicly. Hacks or incidents are not mentioned in the material reviewed. Check local rules on crypto trading before use.

6 steps

How to get started with TanX.fi

1
Read the Pricing and Docs pages on the official site to confirm current fees and supported markets.
2
Check that online trading of crypto is permitted where you live and whether your use case needs KYC.
3
Choose a network (the homepage lists Ethereum, Polygon, Starknet and Arbitrum) and connect a compatible wallet or a Fireblocks account.
4
Deposit or bridge a small amount of a supported asset first to test the process.
5
Place a limit order on a market such as ETH/USDC and review the order book before confirming.
6
Institutions and desks can review the API documentation and decide whether to restrict trades to known counterparties.

Open TanX.fi

Who TanX.fi is for

TanX.fi is aimed at OTC desks, exchanges, brokers and active traders who want order-book execution without giving up custody. It may also suit firms that need to limit trades to vetted counterparties. Casual users looking for a large, deeply liquid DEX should compare liquidity first.

TanX.fi FAQs

What is TanX.fi?

TanX.fi is a decentralized order-book exchange. Its homepage describes it as a self-custodial, high-performance liquidity network for traders, institutions and exchanges, and DefiLlama says it is powered by StarkWare.

Which networks does TanX.fi support?

DefiLlama lists Ethereum, Arbitrum, Linea, Mode, Polygon, Scroll and Optimism. The homepage network selector shows Ethereum, Polygon, Starknet and Arbitrum. Check the app for the current list.

Does TanX.fi charge gas fees?

The site says trades carry no gas fee. Exchange fees are not stated in the material reviewed, and the site has a separate pricing page where they should be listed.

Is TanX.fi self-custodial?

The homepage says users keep custody of their assets and can trade from a Fireblocks account or any wallet. As with any DEX, smart-contract risk still applies.

Does TanX.fi require KYC?

It offers a feature to route trades only to pre-approved, known counterparties, shown on the homepage as a KYC on/off option. Whether the base exchange requires identity checks is not stated publicly.

Does TanX.fi have a token?

No. DefiLlama lists no token for TanX.fi, and its homepage does not mention one.

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