Tern is a unified swap protocol for executing token swaps across chains through a single API. Request a quote, make one deposit, and receive the tokens you requested on your destination chain. Tern coordinates execution across chains, with every swap designed to either complete or refund.

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Designed for reliable execution

Swaps shouldn’t leave users wondering where their funds went. Tern is built around three core guarantees.
  • Atomic cross-chain swaps. Both sides of a cross-chain swap are linked by the same cryptographic secret. Either the user receives their destination tokens, or their original deposit is refunded.
  • Non-custodial by design. Tern’s contracts have no owner, pause, or upgrade mechanism. Funds follow predefined contract rules, not discretionary operator actions.
  • Guaranteed minimum output. Every quote specifies a minimum amount the user will receive. If execution cannot satisfy that amount, the swap reverts, or the deposit is refunded.

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What you can build

Cross-chain swaps

Swap any supported token on one chain for a token on another. Tern coordinates the execution across both chains.

Same-chain swaps

Exchange one token for another on the same chain through a single transaction.

Private swaps

Swap from a shielded balance on Starknet without exposing the user’s account in the transaction.
Users can fund cross-chain swaps directly from their wallets or send tokens to a deposit address, including from centralized exchanges. Explore supported chains to see where Tern is currently available.

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Start building

Quickstart

Get your first swap running in minutes. Request a quote, submit a deposit, and track execution. No API key required.

How Tern works

Understand the lifecycle of a swap, from quote generation and deposit detection to execution, settlement, and refunds.