Send Message

string;

string;

boolean;

string;

{
  mode: "engine";
  engine_url: string;
  engine_authorization_token: string;
  engine_backend_wallet_address: string;
} | {
  mode: "session_key";
  smart_account_address: string;
  smart_account_factory_address: string;
  smart_account_session_key: string;
} | {
  mode: "client";
  signer_wallet_address: string;
}

{
  chainIds: string[] | null;
  contractAddresses: string[] | null;
  walletAddresses: string[] | null;
}

fetch("https://nebula-api.thirdweb.com/chat", {
  method: "POST",
  headers: {
    "x-secret-key": "YOUR_THIRDWEB_SECRET_KEY",
  },
  body: {
    message: "Hello",
    stream: false,
    session_id: "3fa85f64-5717-4562-b3fc-2c963f66afa6",
    execute_config: {
      mode: "client",
      signer_wallet_address:
        "0xc3F2b2a12Eba0f5989cD75B2964E31D56603a2cE",
    },
  },
});

{
  "message": "string",
  "actions": [
    {
      "session_id": "string",
      "request_id": "string",
      "type": "init",
      "source": "string",
      "data": "string"
    }
  ],
  "session_id": "string",
  "request_id": "string"
}

Chat actions represent blockchain transactions or operations that Nebula has prepared in response to your request. The response includes both a detailed explanation in the message field and the actual transaction data in the actions array.

Example Response with Chat Action:

{
  "message": "The transaction to transfer 0.0001 ETH to the address resolved from the ENS name `vitalik.eth` (which is `0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045`) is set up successfully. The simulation indicates that the transaction is likely to succeed.\n\nPlease proceed by signing and confirming the transaction.",
  "actions": [
    {
      "session_id": "437a0df7-d512-4ef4-95b5-6168ccbbe097",
      "request_id": "c2b51ed6-da79-49ac-b411-206a42059509",
      "type": "sign_transaction",
      "source": "executor",
      "data": "{\"chainId\": 11155111, \"to\": \"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045\", \"data\": \"0x\", \"value\": \"0x5af3107a4000\"}"
    }
  ],
  "session_id": "437a0df7-d512-4ef4-95b5-6168ccbbe097",
  "request_id": "c2b51ed6-da79-49ac-b411-206a42059509"
}

Action Properties:

• session_id: Unique identifier for the current session
• request_id: Unique identifier for the specific request
• type: The type of action (e.g., "sign_transaction")
• source: Origin of the action (e.g., "executor")
• data: Transaction parameters including:
  • chainId: Network identifier (e.g., 11155111 for Sepolia)
  • to: Recipient's address
  • data: Transaction data (if any)
  • value: Amount to send in wei

When handling actions:

• Parse the message field for human-readable transaction details
• Extract the transaction data from the actions array
• Present transaction details to the user for review
• Use a local wallet to sign the transaction
• Broadcast the signed transaction to the network

Example Implementation with thirdweb SDK:

import {
  createThirdwebClient,
  prepareTransaction,
  sendTransaction,
  privateKeyToAccount,
} from "thirdweb";
 
// Example function to handle the API response
async function handleNebulaResponse(response) {
  // Initialize thirdweb client
  const client = createThirdwebClient({
    secretKey: process.env.THIRDWEB_SECRET_KEY,
  });
 
  // Initialize account
  const account = privateKeyToAccount({
    client,
    privateKey: process.env.EOA_PRIVATE_KEY,
  });
 
  // Check if we have any actions
  if (response.actions && response.actions.length > 0) {
    const action = response.actions[0];
 
    // Parse the transaction data from the action
    const txData = JSON.parse(action.data);
 
    try {
      // Prepare transaction with client
      const transaction = prepareTransaction({
        to: txData.to,
        data: txData.data,
        value: BigInt(txData.value),
        chain: txData.chainId,
        client,
      });
 
      // Send transaction with account
      const result = await sendTransaction({
        transaction,
        account,
      });
 
      return result;
    } catch (error) {
      console.error("Error processing transaction:", error);
      throw error;
    }
  }
}
 
// Example usage
const response = await fetch("https://nebula-api.thirdweb.com/chat", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "x-secret-key": "YOUR_THIRDWEB_SECRET_KEY",
  },
  body: JSON.stringify({
    message: "send 0.0001 ETH on sepolia to vitalik.eth",
    execute_config: {
      mode: "client",
      signer_wallet_address:
        "0xc3F2b2a12Eba0f5989cD75B2964E31D56603a2cE",
    },
  }),
});
 
const data = await response.json();
const result = await handleNebulaResponse(data);