Ethereum Provider API

Brave injects a windows.ethereum provider object on all pages.
This object is defined by EIP-1193.

This object gives websites the ability to:

• Make requests to an Ethereum node (or a compatible network) to read data from the blockchain
• Request permission to 1 or more Ethereum accounts
• Ask the user (if given permission previously) to sign / submit a transaction
• Ask the user (if given permission previously) to sign a message

Provider methods

window.ethereum.request

interface RequestArguments {
  readonly method: string;
  readonly params?: readonly unknown[] | object;
}

Provider.request(args: RequestArguments): Promise<unknown>;

window.ethereum.isConnected

Provider.isConnected(): boolean;

Provider events

connect

The Provider emits connect when it:

• first connects to a chain after being initialized.
• first connects to a chain, after the disconnect event was emitted.

interface ProviderConnectInfo {
  readonly chainId: string;
}

Provider.on('connect', listener: (connectInfo: ProviderConnectInfo) => void): Provider;

disconnect

The Provider emits disconnect when it becomes disconnected from all chains.

Provider.on('disconnect', listener: (error: ProviderRpcError) => void): Provider;

chainChanged

The Provider emits chainChanged when connecting to a new chain.

Provider.on('chainChanged', listener: (chainId: string) => void): Provider;

accountsChanged

The Provider emits accountsChanged if the accounts returned from the Provider (eth_accounts) change.

Provider.on('accountsChanged', listener: (accounts: string[]) => void): Provider;

Legacy Provider methods and events

A number of legacy provider methods are provided for backwards compatability:

sendAsync

Provider.sendAsync(request: Object, callback: Function): void;

This method is superseded by request.

send

Provider.send(...args: unknown[]): unknown;

This method is superseded by request.

event: close

Not yet implemented, but Brave may implement it. This event close is superseded by disconnect.

event: networkChanged

Not yet implemented, but Brave may implement it.

The event networkChanged is superseded by chainChanged.

event: notification

This event is superseded by message.

event: message

Brave has not implemented this event yet.

The message event is intended for arbitrary notifications not covered by other events.

The event will be emitted with an object argument of the following form:

interface ProviderMessage {
  readonly type: string;
  readonly data: unknown;
}

Built-in networks

Chain ID	Network name
0x1	Ethereum mainnet
0x3	Ropsten Testnet
0x3	Ropsten Testnet
0x5	Rinkeby Testnet
0x2a	Kovan Testnet

Disabling the Ethereum provider object insertion

The Ethereum provider object can be disabled from brave://settings/wallet by changing the Default cryptocurrency wallet to None.