Question 1

How to set up WebSocket subscriptions with Ethereumex?

Accepted Answer

Configure the websocket_url and client_type in config, then use Ethereumex.WebsocketClient.subscribe/2 for events like newHeads or logs. Notifications are received in the calling process, requiring manual handling with receive blocks, as detailed in the README examples.

Question 2

Ethereumex vs ExWeb3 elixir_ethers: which is better for Elixir?

Accepted Answer

Ethereumex provides low-level JSON-RPC access with full method coverage, ideal for direct node control. ExWeb3/elixir_ethers offers higher-level abstractions similar to Ethers.js for simplified smart contract interactions. Choose based on whether you need raw access or convenience.

Question 3

Can I use Ethereumex with Infura or other node providers?

Accepted Answer

Yes, by setting the url or websocket_url in configuration to the provider's endpoint, such as Infura's HTTP or WebSocket URLs. Include authentication tokens if required, and ensure the client_type matches the protocol used.

Question 4

How to send a raw transaction using Ethereumex?

Accepted Answer

Use Ethereumex.HttpClient.eth_send_raw_transaction/1 with the signed transaction hex string. You must sign the transaction externally, as Ethereumex doesn't handle signing internally, relying on tools like ex_abi or other crypto libraries.

Question 5

Does Ethereumex support batch requests for efficiency?

Accepted Answer

Yes, use Ethereumex.HttpClient.batch_request/1 or /2 to send multiple RPC calls in one batch, reducing network overhead. The README shows examples with methods like web3_client_version and net_version bundled together.

Question 6

How to handle errors in Ethereumex API calls?

Accepted Answer

Methods typically return {:ok, result} or {:error, error_map}, where error_map contains codes and messages from the JSON-RPC response. Use pattern matching in Elixir to handle different scenarios, and refer to the error examples in the README for guidance.

ethereumex

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