Provider

A thin JSON-RPC wrapper for interacting with chains and Blocto wallet.

Blocto SDK comes with an EIP-1193 compatible provider, you can use it to interact with EVM-compatible chains.

Note that Blocto SDK for EVM-compatible chains is still in Beta. APIs are subject to breaking changes.

Installation

Install from npm/yarn/pnpm

npm

npm i @blocto/sdk

yarn

yarn add @blocto/sdk

pnpm

pnpm add @blocto/sdk

... or via CDN

<script src="https://unpkg.com/@blocto/sdk" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

Usage

Initiate Blocto SDK

After SDK 0.9.0, you can load all evm-compatiable chains once when initiating.

Parameter	Type	Description	Required
defaultChainId	string (hex)	Hexadecimal chainId	Yes
switchableChains	Array AddEthereumChainParameter { chainId: string; rpcUrls: string[]; }	Array of AddEthereumChainParameter	Yes

const bloctoSDK = new BloctoSDK({
  ethereum: {
    defaultChainId: '0x1',
    switchableChains: [
      {
        chainId: '0x1',
        rpcUrls: ['https://mainnet.infura.io/v3/...'],
      },
      {
        chainId: '0xa4b1',
        rpcUrls: ['https://arb1.arbitrum.io/rpc'],
      },
      ...
    ],
  },
  
  // (optional) Blocto app ID
  appId: 'YOUR_BLOCTO_APP_ID',
})

Initiate Blocto SDK before v0.9.0

Before 0.9.0 , you can only initiate with one evm-compatiable chain.

Parameter	Type	Description	Required
ethereum.chainId	String (hex) Number	EVM chain ID to connect to Reference: EVM Networks	Yes
ethereum.rpc	String	JSON RPC endpoint	Yes
appId	String	Blocto dApp ID	No

import BloctoSDK from '@blocto/sdk'

const bloctoSDK = new BloctoSDK({
    ethereum: {
        // (required) chainId to be used
        chainId: '0x1', 
        // (required) JSON RPC endpoint
        rpc: 'https://mainnet.infura.io/v3/YOUR_INFURA_ID',
    },
    
    // (optional) Blocto app ID
    appId: 'YOUR_BLOCTO_APP_ID',
});

Support Chains

Network	Chain ID
Ethereum Mainnet	1
Ethereum Sepolia Testnet	11155111
Arbitrum Mainnet	42161
Arbitrum Sepolia	421614
Optimism Mainnet	10
Optimism Sepolia	11155420
Polygon Mainnet	137
Polygon Amoy Testnet	80002
BSC Mainnet	56
BSC Chapel Testnet	97
Avalanche Mainnet	43114
Avalanche Fuji Testnet	43113
Base Mainnet	8453
Base Sepolia	84532
Zora Mainnet	7777777
Zora Sepolia	999999999
Scroll Mainnet	534352
Scroll Sepolia Testnet	534351

Connect to Blocto wallet

Once the connection request is fired, there would be a prompt modal to guide user to register/login to Blocto wallet

// EIP-1193 way (recommended)
const accounts = bloctoSDK.ethereum.request({ method: 'eth_requestAccounts' })

// Alternative: EIP-1102 way
// CAVEATS! it's deprecated and may be removed from future version
const accounts = await bloctoSDK.ethereum.enable()

After connected with Blocto wallet, you can start to send JSON-RPC request with blocto provider

// sign a message
bloctoSDK.ethereum.request({
  method: 'eth_sign', 
  params: ["0xyourethaddress", "0x48656c6c6f20776f726c64"]
})