Once the user has been authenticated, you can now utilize common web3 functions to interact with the blockchain - completely seamlessly.
  • Get Wallet Address: Access the wallet linked to the user’s authenticated account. This wallet serves as the gateway to all account functions.
  • Sign Messages: Signing a message using the embedded wallet.
  • Send Transactions: After a user has been authenticated, use the WaaS SDK to send transactions using crafted EVM calldata.

​
Get Wallet Address

Each user’s wallet address is unique, cannot be changed, and is 42 characters long, starting with 0x: 
import { SequenceWaaS } from "@0xsequence/waas";

const sequence = new SequenceWaaS(
  {
    projectAccessKey: `${process.env.VITE_PROJECT_ACCESS_KEY}`,
    waasConfigKey: `${process.env.VITE_WAAS_CONFIG_KEY}`,
    network: "arbitrum-nova",
  }
);

const { wallet } = await sequence.signIn({ idToken }, "Session name")
const address = await sequence.getAddress();

console.log(address == wallet) // true

console.log(address)

0xE4b10c53aa75E19E088cfDD0cff7D46a0E4206F0

​
Sign Messages

Wallets can sign messages, which can be validated both onchain and offchain: 
import { SequenceWaaS } from "@0xsequence/waas";

const sequence = new SequenceWaaS(
  {
    projectAccessKey: `${process.env.PROJECT_ACCESS_KEY}`,
    waasConfigKey: `${process.env.WAAS_CONFIG_KEY}`,
    network: "arbitrum-nova",
  }
);

await sequence.signIn({ idToken }, "Session name");

const signature = await sequence.signMessage({
  chainId: 42170,
  message: "Hello world",
});

console.log(signature);

{
  "code": "signedMessage",
  "data": {
    "message": "0x48656c6c6f20776f726c64",
    "signature": "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"
  }
}

​
Send Transactions

All wallets can send transactions right after creation. No extra steps are required to create the wallet, as all users have a wallet by default.
At any point when sending a transaction that requires a fee on a network, you can follow the Fee Options walkthrough for how to send a fee object alongside your transaction or cover gas fees for your users found here.

​
Raw transaction

  • Immediate Transactions: Wallets are ready to send transactions immediately upon creation.
  • Raw Transactions: Specify transaction parameters such as recipient, value, and data. Gas limits and nonce are managed automatically.
  • Network Requirements: Transactions require specifying a chainId for the intended network., for example 1 for Ethereum mainnet, 42161 for Arbitrum, etc.
Error Handling: Use isSentTransactionResponse to verify transactions before execution to prevent failures. WaaS checks that a transaction won’t fail before it runs. If it does fail, you’ll get an error message instead of a transaction receipt. See more in transaction receipts.
import { Sequence, isSentTransactionResponse } from "@0xsequence/waas";

const sequence = new SequenceWaaS(
  {
    projectAccessKey: `${process.env.PROJECT_ACCESS_KEY}`,
    waasConfigKey: `${process.env.WAAS_CONFIG_KEY}`,
    network: "arbitrum-nova",
  }
);

await sequence.signIn({ idToken }, "Session name");

const tx = await sequence.sendTransaction({
  chainId: 42161,
  transactions: [
    {
      to: "0x27CabC9700EE6Db2797b6AC1e1eCe81C72A2cD8D",
      value: "200000000000000000000", // 200 ETH
      data: "0x9fa2b3c4",
    },
  ],
});

if (isSentTransactionResponse(tx)) {
  console.log(tx);
}

{
  "code": "transactionReceipt",
  "data": {
    "txHash": "0xf2e9f728abd65089f25efda5852e605ced377f4e2c89dbf143b124623ed09b2c",
    "metaTxHash": "acc36ed4ef40db74137266e48d863083a5c7e85e2735d69adafcb5b362b6cfc0",
    "nativeReceipt": { ... },
    "receipt": { ... },
    "request": { ... },
    "simulations": [ ... ],
  }
}

​
Send ERC20 Tokens

Helper methods are available for common operations, such as sending ERC20 tokens. This automatically handles the data field of the transaction: 
import { Sequence, isSentTransactionResponse } from "@0xsequence/waas";

const sequence = new SequenceWaaS(
  {
    projectAccessKey: `${process.env.PROJECT_ACCESS_KEY}`,
    waasConfigKey: `${process.env.WAAS_CONFIG_KEY}`,
    network: "mumbai",
  },
  defaults.TEST
);

await sequence.signIn({ idToken }, "Session name");

const tx = await sequence.sendERC20({
  chainId: 42161,
  token: "0x6b175474e89094c44da98b954eedeac495271d0f", // DAI
  to: "0x27CabC9700EE6Db2797b6AC1e1eCe81C72A2cD8D", // Recipient
  value: "200000000000000000000", // 200 DAI
});

if (isSentTransactionResponse(tx)) {
  console.log(tx);
}

{
  "code": "transactionReceipt",
  "data": {
    "txHash": "0x1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3",
    "metaTxHash": "01a087979dccbbc49a45b72d987e5651d65bd97349ccbfdd601b0b7beee9ddc4",
    "nativeReceipt": { ... },
    "receipt": { ... },
    "request": { ... },
    "simulations": [ ... ],
  }
}

​
Send ERC721 Tokens

Sending ERC721 tokens has a helper method. This automatically handles the data field of the transaction: 
import { Sequence, isSentTransactionResponse } from "@0xsequence/waas";

const sequence = new SequenceWaaS(
  {
    projectAccessKey: `${process.env.PROJECT_ACCESS_KEY}`,
    waasConfigKey: `${process.env.WAAS_CONFIG_KEY}`,
    network: "arbitrum-nova",
  }
);

await sequence.signIn({ idToken });

const tx = await sequence.sendERC721({
  chainId: 42161,
  token: "0xF87E31492Faf9A91B02Ee0dEAAd50d51d56D5d4d", // Decentraland LAND
  to: "0x27CabC9700EE6Db2797b6AC1e1eCe81C72A2cD8D", // Recipient
  id: "33347671958251969419410711528313284722562", // Asset ID
});

if (isSentTransactionResponse(tx)) {
  console.log(tx);
}

{
  "code": "transactionReceipt",
  "data": {
    "txHash": "0x4936962d9972a70bffc27f376f55d9c60c12e762819fa6384fdb466664122b6e",
    "metaTxHash": "e6513a60b63359a365f0d3f05744d89823278ec829fc5cb4d275bb815d0f5887",
    "nativeReceipt": { ... },
    "receipt": { ... },
    "request": { ... },
    "simulations": [ ... ],
  }
}

​
Send ERC1155 Tokens

Sending ERC1155 tokens is also supported: 
import { Sequence, isSentTransactionResponse } from "@0xsequence/waas";

const sequence = new SequenceWaaS(
  {
    projectAccessKey: `${process.env.PROJECT_ACCESS_KEY}`,
    waasConfigKey: `${process.env.WAAS_CONFIG_KEY}`,
    network: "arbitrum-nova",
  }
);

await sequence.signIn({ idToken });

const tx = await sequence.sendERC1155({
  chainId: 137,
  token: "0x631998e91476da5b870d741192fc5cbc55f5a52e", // Skyweaver assets
  values: [
    {
      id: "66547", // Asset ID
      value: "200", // Amount for this asset
    },
    {
      id: "68572",
      value: "1000",
    },
  ],
});

​
Call any Contract

Use callContract to interact with any contract method, either through a function signature or ABI, supporting both named and positional arguments.

​
Function Signature

Providing a function signature is the easiest way to call a contract method, as it doesn’t require an ABI. The function signature can be provided with named parameters or positional parameters.
Named Arguments
const tx = await sequence.callContract({
  to: "0x503388C73Ca663eA34e103c11C9F47C9433af471", // Contract address
  abi: "mint(address to, uint256 tokenId)", // Function signature
  func: "mint", // Function name
  args: {
    to: "0xf439e432d54c2Bf5518A1901D3791070d4192986",
    tokenId: "1",
  },
  value: 0, // Value to send
});
Positional Arguments
Notice that passing a named function signature with positional arguments is allowed. 
const tx = await sequence.callContract({
  to: "0x503388C73Ca663eA34e103c11C9F47C9433af471", // Contract address
  abi: "mint(address,uint256)", // Function signature
  func: "mint", // Function name
  args: ["0xf439e432d54c2Bf5518A1901D3791070d4192986", "1"],
  value: 0, // Value to send
});

​
ABI

Providing an ABI is more verbose, but allows for more flexibility, as a single ABI can be used to call multiple methods. ABIs support named arguments and positional arguments. 
const abi = `[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"}]`;

const tx = await sequence.callContract({
  to: "0x6b175474e89094c44da98b954eedeac495271d0f", // Contract address
  abi: abi, // ABI
  func: "transfer", // Function name
  args: {
    _to: "0xf439e432d54c2Bf5518A1901D3791070d4192986",
    _value: "1",
  },
  value: 0, // Value to send
});
Transaction Permissions:
  • Email Accounts: Transactions are enabled after the current session is confirmed via a link sent to the email or phone.
  • Social Login Accounts: Accounts like Google and Facebook can transact immediately after sign-in.
  • For more details, see session management validation.