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When using the Shortcuts endpoints (/shortcuts/route and /shortcuts/bundle), you must choose between two routing strategies: router and delegate. Based on the strategy you choose, the Enso API will route your transaction through the appropriate smart contract.
Use the tx.to response value when sending on-chain a shortcut transaction you obtained.By avoiding hardcoded addresses, your shortcuts will always be routed to the correct contract, even if the address changes in the future. For specific addresses, check out Deployments

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When to use delegate or router?

You must use delegate when:
  • dealing with non-tokenized positions where the state is stored in the protocol rather than represented by a token
  • you need the state to persist in the user’s smart wallet.

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Smart Wallets with delegate

Smart Wallet executes the bundle directly through delegate calls, by calling EnsoShortcutsDelegate contract, and the wallet itself doesn’t hold any tokens during the execution. 
// no approvals of input tokens needed
const route = await client.getRouteData({
  routingStrategy: "delegate",
  //...
});

await signSmartWallet(route.tx, route.gas);
Use delegate for smart wallets Use delegate for smart wallets supporting delegatecall:
  • Enables both tokenized and non-tokenized interactions
  • The state stays in the smart wallet itself.
  • Complex, multi-step operations are more efficient and safer when executed through a smart wallet
  • Simple approval model
  • Limited to token-based operations

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EOAs with router

With router strategy, the Enso Router contract will hold the intermediate tokens between actions. With this strategy, you must approve the Enso router contract to operate with your input tokens: 
const approval1 = await client.getApprovalData({
  tokenAddress: token1,
  amount: amt1,
  chainId,
  fromAddress,
});

const approval2 = await client.getApprovalData({
  tokenAddress: token2,
  amount: amt2,
  chainId,
  fromAddress,
});

const route = await client.getRouteData({
  routingStrategy: "router",
  //...
});

await signEoa(approval1.tx, approval1.gas);
await signEoa(approval2.tx, approval2.gas);
await signEoa(route.tx, route.gas);
Use router for EOA Use router strategy for EOAs or simpler smart wallets:
  • Works with tokenized interactions only
  • Uses the universal router contract.
  • Supports tokenized and non-tokenized interactions
  • Enables complex DeFi strategies
  • Works with lending positions and other stateful interactions

Updated