The POST shortcuts/bundle API converts specifications of DeFi actions into efficient calldata. This API allows chaining actions together by referencing outputs from previous operations.

The Bundle API requires a smart wallet supporting delegatecall for most functionality. Standard EOAs (Externally Owned Accounts) will have limited functionality. Learn more about routing strategies.

Bundle API Bundle API

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Example

In this guide, we’ll create a bundle transaction that performs a complete DeFi strategy composed out of following actions:

  • convert ETH to wstETH,
  • deposit it into Aave V3
  • transfer the resulting aTokens to another address.

For more examples, explore the Shortcuts Library and check out the Actions Reference for all available actions.

1

Authentication

  1. Create an API key using Enso Dashboard.
  2. Securely store your API key and make it available in your environment:
authentication.sh
ENSO_API_KEY="$ENSO_API_KEY"
echo $ENSO_API_KEY >> .env
git ignore .env
source .env
2

Define your bundle actions

For our DeFi strategy, we’ll define three actions:

  1. Convert ETH to wstETH using the route action
  2. Deposit wstETH into Aave V3
  3. Transfer the resulting aTokens to a specified address

Explore the Actions Reference for all available actions.

Chain individual actions’ results by using useOutputOfCallAt. This parameter references the output from a prior action by its zero-based index.

const bundleActions = [
  {
    "protocol": "enso",
    "action": "route",
    "args": {
      "tokenIn": "0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee", // ETH
      "tokenOut": "0x7f39c581f595b53c5cb19bd0b3f8da6c935e2ca0", // wstETH
      "amountIn": "1000000000000000000", // 1 ETH
      "slippage": "300" // 3% slippage
    }
  },
  {
    "protocol": "aave-v3",
    "action": "deposit",
    "args": {
      "primaryAddress": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2", // Aave V3 lending pool
      "tokenIn": "0x7f39c581f595b53c5cb19bd0b3f8da6c935e2ca0", // wstETH
      "tokenOut": "0x0b925ed163218f6662a35e0f0371ac234f9e9371", // aEthwstETH
      "amountIn": {
        "useOutputOfCallAt": 0 // Use output from first action
      }
    }
  }
];
3

Send the bundle request

Submit the bundle to the API to get the transaction data. The path parameters need to include fromAddress, receiver, and routingStrategy. The receiver parameter is the address that will receive the aTokens after the deposit, and this is done automatically.

bundle.sh
CHAIN_ID=1 # Ethereum Mainnet
FROM_ADDRESS="0xd8da6bf26964af9d7eed9e03e53415d37aa96045" # the address of the sender
ROUTING_STRATEGY="delegate" # Use 'router' for EOAs
RECEIVER="0xd8da6bf26964af9d7eed9e03e53415d37aa96045" # the receiver of the aTokens

BUNDLE_RESPONSE=$(curl -X 'POST' \
  "https://api.enso.finance/api/v1/shortcuts/bundle?chainId=$CHAIN_ID&fromAddress=$FROM_ADDRESS&routingStrategy=$ROUTING_STRATEGY&receiver=$RECEIVER" \
  -H 'accept: application/json' \
  -H "Authorization: Bearer $ENSO_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '[
    {
      "protocol": "enso",
      "action": "route",
      "args": {
        "tokenIn": "0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee",
        "tokenOut": "0x7f39c581f595b53c5cb19bd0b3f8da6c935e2ca0",
        "amountIn": "1000000000000000000",
        "slippage": "300"
      }
    },
    {
      "protocol": "aave-v3",
      "action": "deposit",
      "args": {
        "primaryAddress": "0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2",
        "tokenIn": "0x7f39c581f595b53c5cb19bd0b3f8da6c935e2ca0",
        "tokenOut": "0x0b925ed163218f6662a35e0f0371ac234f9e9371",
        "amountIn": {
          "useOutputOfCallAt": 0
        }
      }
    }
  ]' | jq)

echo $BUNDLE_RESPONSE

The API will return a response containing:

  • bundle: The bundle actions exactly as submitted
  • tx: A transaction object with calldata—the executable form of the calculated route
  • amountOut: Expected output amount
  • gas: Estimated gas for the transaction
  • createdAt: Block number when the response was generated
4

Next steps

Updated