DEX on TON

A DEX on TON is an automated exchange built as a set of smart contracts on the TON blockchain. Like Uniswap on Ethereum or Raydium on Solana, it lets users swap tokens against pooled liquidity, with prices set by an algorithm rather than an order book.

How it works

The dominant model is the AMM (automated market maker). For each trading pair (e.g. TON/USDT) a pool contract holds both assets. Anyone can swap by sending one token to the pool and receiving the other; the pool’s price moves along a curve (constant product, weighted, or stable depending on the pool type).

Anyone can also become a liquidity provider (LP): deposit equal value of both tokens, receive an LP token as a receipt, and earn a slice of the swap fees pro rata. LPs take impermanent-loss risk in exchange.

Major DEXes in 2026

• STON.fi — the original AMM on TON; the largest by TVL. Constant-product pools and a stable-swap pool for USDT-stable trades. Token: STON (governance + LP rewards).
• DeDust — concentrated-liquidity pools (similar to Uniswap v3) plus classic AMM. Strong on TON/jetton pairs and LST liquidity. Token: SCALE.
• Tonpump — a meme-token launchpad-and-AMM hybrid; high volume in volatile periods, lower TVL than the two majors.
• TONCO, NoStrings, others — smaller venues focused on niches (CLMM, RFQ, OTC).

Why it matters

Before native USDT (April 2024) DEX activity on TON was thin. After, the largest TON/USDT and USDT/USDT-stable pools became the chain’s deepest liquidity by far. As of 2026:

• TON DEX 24h volume routinely sits in the tens of millions of dollars.
• TVL across DEXes is in the hundreds of millions, dominated by USDT and TON.
• Most user swaps route through STON.fi or DeDust; aggregators (Bemo, Tonana) split orders between the two.

Asynchronous trades

A DEX swap on TON is not atomic the way a Uniswap swap is. The flow looks like:

1. Wallet sends jetton transfer to the user’s jetton wallet.
2. That jetton wallet forwards to the DEX router.
3. The router talks to the pool contract.
4. The pool sends the output jetton to the user’s other jetton wallet.

Each hop is a separate message; the whole swap typically takes 5–10 seconds and 0.3–0.5 TON in fees. If something fails midway (insufficient slippage, frozen wallet), funds bounce back along the chain.

This is why TON DEX UIs show a swap as “pending” longer than EVM DEXes — it is genuinely a multi-block sequence, not a UI delay.

Slippage and MEV

Slippage protection is set on the user’s side: every swap message includes a minimum-output parameter, and the pool reverts if the actual output falls below it. MEV (sandwich attacks, front-running) exists in principle but has been less of an issue than on Ethereum L1, partly because of the asynchronous model and partly because retail volume is smaller.

Aggregators

By 2026 most active traders use aggregators rather than going to a single DEX directly. They quote across STON.fi, DeDust, and smaller pools, split orders, and route through the cheapest path. Tonkeeper, MyTonWallet, and the in-Telegram Wallet all integrate aggregator routing for the in-app swap feature.

Risks

• Smart-contract risk — audits exist, but a bug in a router or a pool contract could drain funds.
• Impermanent loss for LPs.
• Liquidity depth — outside TON, USDT, NOT, and major LSTs, slippage on long-tail jettons can be brutal.
• Spoofed jettons — fake USDT/NOT jettons appear in copycat pools; always verify the jetton master.