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+---
+eip: 1193
+title: Ethereum Provider API
+author: Ryan Ghods (@ryanio), Marc Garreau (@marcgarreau)
+discussions-to: https://ethereum-magicians.org/t/eip-1193-ethereum-provider/640
+status: Draft
+type: Standards Track
+category: Interface
+created: 2018-06-30
+requires: 1102
+---
+
+## Summary
+
+This proposal formalizes an Ethereum Provider API.
+
+The provider is designed to be minimal, containing 3 methods: `send`, `subscribe`, and `unsubscribe`. It emits 4 types of events: `connect`, `close`, `networkChanged`, and `accountsChanged`.
+
+## API
+
+### Send
+
+```js
+ethereum.send(method: String, params?: Array<any>): Promise<any>;
+```
+
+Promise resolves with `result` or rejects with `Error`.
+
+See the [available methods](https://github.com/ethereum/wiki/wiki/JSON-RPC#json-rpc-methods).
+
+### Subscriptions
+
+#### Subscribe
+
+```js
+ethereum.subscribe(subscriptionType: String, params?: Array<any>): Promise<any>;
+```
+
+Promise resolves with `subscriptionId: String` or rejects with `Error`.
+
+See the [types of subscriptions](https://github.com/ethereum/go-ethereum/wiki/RPC-PUB-SUB#supported-subscriptions).
+
+Results emit on `subscriptionId` using [EventEmitter](https://nodejs.org/api/events.html). Attach listeners with:
+
+```js
+ethereum.on(subscriptionId, listener: (result: any) => void): this;
+```
+
+The event emits with `result`, the subscription `result` or an `Error` object.
+
+#### Unsubscribe
+
+```js
+ethereum.unsubscribe(subscriptionId: String): Promise<Boolean|Error>;
+```
+
+Promise resolves with `success: Boolean` or rejects with `Error`.
+
+All [EventEmitter](https://nodejs.org/api/events.html) listeners on `subscriptionId` will also be removed.
+
+### Events
+
+Events are emitted using [EventEmitter](https://nodejs.org/api/events.html).
+
+#### connect
+
+The provider emits `connect` on connect to a network.
+
+```js
+ethereum.on('connect', listener: () => void): this;
+```
+
+You can detect which network by sending `net_version`:
+
+```js
+const network = await ethereum.send('net_version');
+> '1'
+```
+
+#### close
+
+The provider emits `close` on disconnect from a network.
+
+```js
+ethereum.on('close', listener: (code: Number, reason: String) => void): this;
+```
+
+The event emits with `code` and `reason`. The code follows the table of [`CloseEvent` status codes](https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent#Status_codes).
+
+#### networkChanged
+
+The provider emits `networkChanged` on connect to a new network.
+
+```js
+ethereum.on('networkChanged', listener: (networkId: String) => void): this;
+```
+
+The event emits with `networkId`, the new network returned from `net_version`.
+
+#### accountsChanged
+
+The provider emits `accountsChanged` if the accounts returned from the provider (`eth_accounts`) changes.
+
+```js
+ethereum.on('accountsChanged', listener: (accounts: Array<String>) => void): this;
+```
+
+The event emits with `accounts`, an array of the accounts' public keys.
+
+### Constructor
+
+```js
+ethereum.constructor.name;
+> 'EthereumProvider'
+```
+
+## Examples
+
+```js
+// Request Ethereum Provider (EIP 1102)
+window.addEventListener('message', event => {
+  if (event.data && event.data.type === 'ETHEREUM_PROVIDER_SUCCESS') {
+    start(window.ethereum);
+  }
+});
+window.postMessage({ type: 'ETHEREUM_PROVIDER_REQUEST' }, this.origin);
+
+function start(ethereum) {
+  // A) Primary use case - set provider in web3.js
+  web3.setProvider(ethereum);
+
+  // B) Secondary use case - use provider object directly
+  // Example: Log accounts
+  ethereum
+    .send('eth_accounts')
+    .then(accounts => {
+      console.log(`Accounts:\n${accounts.join('\n')}`);
+    })
+    .catch(error => {
+      console.error(
+        `Error fetching accounts: ${error.message}.
+         Code: ${error.code}. Data: ${error.data}`
+      );
+    });
+
+  // Example: Log last block
+  ethereum
+    .send('eth_getBlockByNumber', ['latest', 'true'])
+    .then(block => {
+      console.log(`Block ${block.number}:\n${block}`);
+    })
+    .catch(error => {
+      console.error(
+        `Error fetching last block: ${error.message}.
+         Code: ${error.code}. Data: ${error.data}`
+      );
+    });
+
+  // Example: Log new blocks
+  let subId;
+  ethereum
+    .subscribe('newHeads')
+    .then(subscriptionId => {
+      subId = subscriptionId;
+      ethereum.on(subscriptionId, block => {
+        if (result instanceOf Error) {
+          const error = result;
+          console.error(
+            `Error from newHeads subscription: ${error.message}.
+             Code: ${error.code}. Data: ${error.data}`
+          );
+        } else {
+          console.log(`New block ${block.number}:\n${block}`);
+        }
+      });
+    })
+    .catch(error => {
+      console.error(
+        `Error making newHeads subscription: ${error.message}.
+         Code: ${error.code}. Data: ${error.data}`
+       );
+    });
+  // to unsubscribe
+  ethereum
+    .unsubscribe(subId)
+    .then(result => {
+      console.log(`Unsubscribed newHeads subscription ${subscriptionId}`);
+    })
+    .catch(error => {
+      console.error(
+        `Error unsubscribing newHeads subscription: ${error.message}.
+         Code: ${error.code}. Data: ${error.data}`
+      );
+    });
+
+  // Example: Log when accounts change
+  const logAccounts = accounts => {
+    console.log(`Accounts:\n${accounts.join('\n')}`);
+  };
+  ethereum.on('accountsChanged', logAccounts);
+  // to unsubscribe
+  ethereum.removeListener('accountsChanged', logAccounts);
+
+  // Example: Log if connection ends
+  ethereum.on('close', (code, reason) => {
+    console.log(
+      `Ethereum provider connection closed: ${reason}. Code: ${code}`
+    );
+  });
+}
+```
+
+## Specification
+
+### Send
+
+The `send` method **MUST** send a properly formatted [JSON-RPC request](https://www.jsonrpc.org/specification#request_object).
+
+If the Ethereum JSON-RPC API returns a response object with no error, then the Promise **MUST** resolve with the `response.result` object untouched by the implementing Ethereum Provider.
+
+If the Ethereum JSON-RPC API returns response object that contains an error property then the Promise **MUST** be rejected with an Error object containing the `response.error.message` as the Error message, `response.error.code` as a code property on the error and `response.error.data` as a data property on the error.
+
+If an error occurs during processing, such as an HTTP error or internal parsing error then the Promise **MUST** be rejected with an Error object containing a human readable string message describing the error and **SHOULD** populate code and data properties on the error object with additional error details.
+
+If the implementing Ethereum Provider is not talking to an external Ethereum JSON-RPC API provider then it **MUST** resolve with an object that matches the JSON-RPC API object as specified in the [Ethereum JSON-RPC documentation](https://github.com/ethereum/wiki/wiki/JSON-RPC). In case of an error, ensure that the Promise is rejected with an Error that matches the above shape.
+
+### Subscriptions
+
+The `subscribe` method **MUST** send a properly formatted [JSON-RPC request](https://www.jsonrpc.org/specification#request_object) with method `eth_subscribe` and params `[subscriptionType: String, {...params: Array<any>}]` and **MUST** return a Promise that resolves with `subscriptionId: String` or rejected with an Error object containing a human readable string message describing the error and **SHOULD** populate code and data properties on the error object with additional error details.
+
+The `unsubscribe` method **MUST** send a properly formatted [JSON-RPC request](https://www.jsonrpc.org/specification#request_object) with method `eth_unsubscribe` and params `[subscriptionId: String]` and **MUST** return a Promise that resolves with `result: Boolean` or rejected with an Error object containing a human readable string message describing the error and **SHOULD** populate code and data properties on the error object with additional error details.
+
+If the `unsubscribe` method returns successfully with a `True` result, the implementing provider **MUST** remove all listeners on the `subscriptionId` using `ethereum.removeAllListeners(subscriptionId);`.
+
+If an error occurs during processing of the subscription, such as an HTTP error or internal parsing error then the Promise **MUST** return with an Error object containing a human readable string message describing the error and **SHOULD** populate code and data properties on the error object with additional error details.
+
+The implementing Ethereum Provider **MUST** emit every subscription response `result` with the eventName `subscriptionId`.
+
+If an error occurs during the listening of the subscription, the Ethereum Provider **MUST** emit an Error object to the eventName `subscriptionId` containing a human readable string message describing the error and **SHOULD** populate code and data properties on the error object with additional error details.
+
+If the implementing provider does not support subscriptions, then it **MUST** leave the `subscribe` and `unsubscribe` methods undefined.
+
+### Events
+
+If the network connects, the Ethereum Provider **MUST** emit an event named `connect`.
+
+If the network connection closes, the Ethereum Provider **MUST** emit an event named `close` with args `code: Number, reason: String` using the [status codes for `CloseEvent`](https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent#Status_codes) and a short human readable reason.
+
+If the network the Ethereum Provider is connected to changes, the Ethereum Provider **MUST** emit an event named `networkChanged` with args `networkId: String` containing the ID of the new network (using the Ethereum JSON-RPC call `net_version`).
+
+If the accounts connected to the Ethereum Provider change, the Ethereum Provider **MUST** send an event with the name `accountsChanged` with args `accounts: Array<String>` containing the accounts' public key(s).
+
+### Class
+
+The name of the constructor of the Ethereum Provider **MUST** be `EthereumProvider`.
+
+## Topics
+
+### Multiple chain support
+
+As per discussion in [ethereum/interfaces#16](https://github.com/ethereum/interfaces/issues/16), to handle support of changing networks we recommend introducing a new RPC method `eth_changeNetwork`. In the future depending on the implementation of sharding, an additional method could be `eth_changeShard`.
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).