How can I get the latest block, coinbase and other information using Nethereum?

  • Take a look to this link: nethereum.readthedocs.io/en/latest/introduction/web3 essentially, you need to instantiate a web3 object and thereafter use the standard json rpc calls to get the information you want. Web3 is a wrapper for this json RPC api github.com/ethereum/wiki/wiki/JSON-RPC
    – Briomkez
    Jan 25, 2019 at 21:40
  • Thanks for this, but the information is still abstract. I need a concrete example. I can use web3 , instantiate, connect to my node... and then im stuck... so far for example, I am doing : _web3.Eth.CoinBase....
    – DottoreM
    Jan 26, 2019 at 10:32
  • I can get smart contracts, unlock account etc. but getting simple information about the node such as the block and coinbase is not working
    – DottoreM
    Jan 26, 2019 at 10:33
  • Are you sure, your node has the "with" json rpc api? I am AFK now. Maybe later I can write a simple example with geth and JavaScript web3, which follows the same principle :)
    – Briomkez
    Jan 26, 2019 at 11:46
  • thanks i would appreciate that. but why can i not use c#? this -> _web3.Eth.CoinBase <- is c#
    – DottoreM
    Jan 26, 2019 at 11:49

1 Answer 1


As promised, I post here a simple example. The main idea is the same for all languages for each a web3 implementation exists (e.g., Javascript, Python and C#).


First we need to start an Ethereum client (e.g., geth, parity, nethereum) with the desired rpcapi (or ipcapi if you want it works only locally) enabled. For instance with geth:

geth --rpccorsdomain="*" --rpcapi db,eth,net,web3,personal,miner --rpcaddr --rpc

A brief comment on the options:

  • rpc enables the rpc server
  • rpcapi to expose the selected RPC APIs. At this link you can get an overall overview. In this case I selected (essentially all APIs)
  • rpccorsdomain restricts the IP address which can perform calls (in this case I selected all IPs, it is not secure)
  • rpcaddr express which address to use, with you use its external IP


To configure a simple web3 Nethereum project you can follow this 5-step tutorial. Now we want to read the information from the running geth instance with C#.

First of all, we need to instantiate a web3 instance connected with the client (in my case the address of the running Ethereum instance, is my raspberry PI on

 var web3 = new Web3("");

In the following I report some of the calls you requested:

  • Block number:

    var blockNumber = await web3.Eth.Blocks.GetBlockNumber.SendRequestAsync();
    Console.WriteLine($"Block Number: {blockNumber.Value}");
  • Coinbase:

    var coinbase = await web3.Eth.CoinBase.SendRequestAsync();
    Console.WriteLine($"Coinbase: {coinbase}");

If the interface eth does not belong to the rpcapi option of the client, then the C#'s Eth API is simply not available.

For the other information you need to find the C# equivalent methods' name of the JSON RPC APIs from Nethereum. Unfortunately, I did not manage to find a complete list and the naming convention is (to me at least) not 100% clear. Here, you can find some clue but the list is not complete.


A more complicated alternative is to perform directly the json rpc api calls with Nethereum. After all, web3 is simply a wrapper for the JSON RPC API.

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