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ThirdwebSDK

The ThirdwebSDK is the entry point to all functionality of the TypeScript SDK.

You initialize the SDK on your desired chain and use the instance to access the different methods and properties of the SDK.

Usage​

The SDK can be initialized in either read-only mode or read-write mode.

If you are using one of our default chains, provide the name of the chain as a string.

For non-default chains, see configuring chains or custom chains.

View default chains
  • Ethereum: "ethereum"
  • Goerli: "goerli"
  • Polygon: "polygon"
  • Mumbai: "mumbai"
  • Arbitrum One: "arbitrum"
  • Arbitrum Goerli: "arbitrum-goerli"
  • Optimism: "optimism"
  • Optimism Goerli Testnet: "optimism-goerli"
  • Binance SmartChain: "binance"
  • Binance SmartChain Testnet: "binance-testnet"
  • Fantom Opera: "fantom"
  • Fantom Testnet: "fantom-testnet"
  • Avalanche C Chain: "avalanche-fuji"
  • Avalanche Fuji Testnet: "avalanche-fuji-testnet"
  • Localhost: "localhost"

Using this method, you can only read data from the blockchain.

// Read-only mode
const readOnlySdk = new ThirdwebSDK("ethereum");

Configuration​

Chain (required)​

The chain you want your SDK instance to use.

There are 700+ chains available in the @thirdweb-dev/chains package. Import the chain you want to use from the package and pass it to the activeChain prop. If your chain is not included, see configuring custom chains.

Install Package

Install the @thirdweb-dev/chains package to use non-default chains.

npm install @thirdweb-dev/chains
import { ThirdwebSDK } from "@thirdweb-dev/sdk";
import { Gnosis } from "@thirdweb-dev/chains";

const sdk = new ThirdwebSDK(
  Gnosis,
);

Custom EVM Chains​

If your chain is not included in the @thirdweb-dev/chains package, you can provide the chain information yourself.

import { ThirdwebSDK } from "@thirdweb-dev/sdk";

const sdk = new ThirdwebSDK({
  // === Required information for connecting to the network === \\
  chainId: 59140, // Chain ID of the network
  // Array of RPC URLs to use
  rpc: ["<your-rpc-url-here>"],

  // === Information for adding the network to your wallet (how it will appear for first time users) === \\
  // Information about the chains native currency (i.e. the currency that is used to pay for gas)
  nativeCurrency: {
    decimals: 18,
    name: "Consensys ETH",
    symbol: "crETH",
  },
  shortName: "czkevm", // Display value shown in the wallet UI
  slug: "consensys", // Display value shown in the wallet UI
  testnet: true, // Boolean indicating whether the chain is a testnet or mainnet
  chain: "ConsenSys", // Name of the network
  name: "ConsenSys zkEVM Testnet", // Name of the network
});

Override Default Values​

Override the default values (such as an RPC URL) for any given chain.

Optional

By default, the SDK provides free-to-use RPCs. No configuration required!

View the default RPC URLs for each network.

Using the spread syntax, you can override any properties of a chain, such as the rpc field.

import { ThirdwebSDK } from "@thirdweb-dev/sdk";
import { Dogechain } from "@thirdweb-dev/chains";

const sdk = new ThirdwebSDK({
  ...Dogechain,
  rpc: ["https://<your-rpc-to-use>.com"], // Override the "rpc" field.
  // ... Override any other fields you want to customize.
});

gasless (optional)​

Use gasless transactions to forward all transactions to a relayer.

Currently supports either OpenZeppelin Defender or Biconomy relayers.

import { ThirdwebSDK } from "@thirdweb-dev/sdk";

const sdk = new ThirdwebSDK("ethereum", {
  gasless: {
    // By specifying a gasless configuration - all transactions will get forwarded to enable gasless transactions
    openzeppelin: {
      relayerUrl: "<open-zeppelin-relayer-url>", // your OZ Defender relayer URL
      relayerForwarderAddress: "<open-zeppelin-forwarder-address>", // the OZ defender relayer address (defaults to the standard one)
    },
    biconomy: {
      apiId: "biconomy-api-id", // your Biconomy API Id
      apiKey: "biconomy-api-key", // your Biconomy API Key
      deadlineSeconds: 123, // your Biconomy timeout preference
    },
  },
});

gasSettings (optional)​

The gas settings to use when sending transactions.

  • maxPriceInGwei: Maximum gas fee to pay for a transaction. Defaults to 300.
  • speed: The priority level to set for a transaction. Either "standard", "fast", or "fastest". Defaults to fastest.
import { ThirdwebSDK } from "@thirdweb-dev/sdk";

const sdk = new ThirdwebSDK("ethereum", {
  gasSettings: {
    maxPriceInGwei: 300,
    speed: "fastest", // standard, fast, fastest
  },
});

readOnlySettings (optional)​

Override the RPC URL that is used for read operations on a given chain.

import { ThirdwebSDK, ChainId } from "@thirdweb-dev/sdk";

const sdk = new ThirdwebSDK("ethereum", {
  readonlySettings: {
    rpcUrl: "https://my-rpc-url.com", // Use this RPC URL for read operations
    chainId: ChainId.Mainnet, // On this chain ID
  },
});