KoinlyticsSynapse was one of the biggest bridges of the 2021-2022 cycle. Its model: liquidity pools of an internal token (nUSD, nETH) on every supported chain, connected via a permissioned validator set. Users bridge by swapping into nUSD on source, transferring nUSD across, then swapping out on destination.
The nUSD / nETH design
- Synapse issues nUSD (pegged to $1) on every supported chain.
- Curve-like pools on each chain: nUSD / USDC / USDT (and other stables).
- To bridge USDC from Arb to Optimism: swap Arb-USDC → Arb-nUSD → Op-nUSD (via bridge) → Op-USDC.
Why it worked
- Any new chain adds a nUSD pool; bridging works immediately.
- Deep long-tail chain support (Fantom, Aurora, Cronos, Metis, Klaytn).
- Aggregate volume in cycle peaks.
Where it lost ground
- CCTP made canonical USDC bridging free and native.
- Across and intent-based bridges undercut on speed and fee.
- Wormhole and LayerZero-based bridges won the app-integration battle.
Where Synapse still wins
- Long-tail chains without CCTP or Across support.
- ETH bridging via nETH.
- Users who want a single UI for many small chains.
Trade-offs
- Double-swap slippage (into nUSD, out of nUSD).
- Bridge validator set risk (Synapse Bridge is a lock-and-mint model).
- Ecosystem funding pressure as competitors take share.