STON.fi
AuditedVerifiedProfitableRisk AlertSTON.fi is the dominant automated market maker on TON, holding roughly two-thirds of all TON DEX liquidity across constant-product, stableswap and weighted pools. Live since December 2022 with a Trail of Bits audit of its v2 core.
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The Problem
TON arrived with an enormous Telegram-native user base but almost no DeFi infrastructure, and its asynchronous actor-model VM means EVM AMM code cannot simply be ported. A swap on TON is a multi-block message cascade with real failure and refund paths, so building a safe, capital-efficient exchange there is a genuinely different engineering problem rather than a redeployment.
The Solution
A native TVM automated market maker built around a Router that acts as the single entrypoint and routes messages to per-pair Pool contracts, with LpAccount and LpWallet contracts handling position accounting. Constant-product, stableswap and weighted curves run on separate router deployments, with per-pool configurable fees defaulting to 0.3% and hard-capped at 1% in the contract.
Why it Matters
STON.fi is not a challenger on TON, it is the market: roughly 66% of all TON DEX TVL and 4.4x its nearest competitor, sustained across a 93% ecosystem drawdown. It carries a Trail of Bits review of its v2 core, has a fixed 100M token supply with minting permanently renounced, and has extended past the AMM into Omniston cross-chain RFQ aggregation and the first fully on-chain DAO on TON. It also publishes the TON ecosystem's most widely used Rust infrastructure libraries.
Protocol Metrics
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View allFrequently asked questions about STON.fi
What is STON.fi?+
STON.fi is a DEX protocol operating on TON. STON.fi is the dominant automated market maker on TON, holding roughly two-thirds of all TON DEX liquidity across constant-product, stableswap and weighted pools. Live since December 2022 with a Trail of Bits audit of its v2 core.
How does STON.fi work?+
A native TVM automated market maker built around a Router that acts as the single entrypoint and routes messages to per-pair Pool contracts, with LpAccount and LpWallet contracts handling position accounting. Constant-product, stableswap and weighted curves run on separate router deployments, with per-pool configurable fees defaulting to 0.3% and hard-capped at 1% in the contract.
Is STON.fi safe?+
DeFi Sentinel rates STON.fi A with a safety score of 78/100, indicating low-to-moderate risk. The score reflects five risk dimensions: smart contract & technical risk, economic design & market risk, governance & centralization, sustainability & competitive position, and reputation & social trust. STON.fi has 4 audits on record. DeFi Sentinel's analysis flagged 2 high, 4 medium, 1 low risk alerts across Governance & Centralization, Smart Contract & Technical Risk and Economic Design & Market Risk. As with all DeFi protocols, residual risk remains and users should review the full risk breakdown before depositing.
What is the safety score of STON.fi?+
STON.fi has a DeFi Sentinel safety score of 78/100 (rating A), last updated September 17, 2026. The score is computed across smart contract & technical risk (30%), economic design & market risk (25%), governance & centralization (20%), sustainability & competitive position (15%), and reputation & social trust (10%).
Which chains does STON.fi support?+
STON.fi is deployed on TON.
Has STON.fi been audited?+
Yes. STON.fi has 4 audit reports on record from firms including Trail of Bits, TonTech, CertiK Skynet. Audit reports and dates are linked under the Resources tab on this page.