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I'm working on an open-source project.

I'm hesitant to include web3.js with all the code.

I just want to read a single value from the Ethereum blockchain.

That is why my requirement is to avoid 100KB libraries.

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    The problem is that it's not so straightforward. You either have to use some external service (such as Etherscan API) or then query a node directly. If you want to query a node directly you need to run your own node or have access to some shared node (Infura for example) - all of that is much easier with libraries. – Lauri Peltonen Mar 3 '20 at 10:30
  • You can use Etherscan Developers APIs, then you'll just need to require("request"). – goodvibration Mar 3 '20 at 10:42
  • Thanks, using Etherscan API should be simple enough, can make a web request without involving any libraries. Trusted 3rd party kind of sucks but it's a reasonable risk-reward ratio, nothing too critical. – Mars Robertson Mar 3 '20 at 11:31
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You could just use a HTTP POST request to a geth or parity node.

Here is the documentation with examples using curl: https://github.com/ethereum/wiki/wiki/JSON-RPC

Instead of curl, just use a HTTP request and POST the data.

You'll need to make sure your local node allows connections. I use this something like this: geth --rpcapi eth,net,web3 --rpccorsdomain * --rpc --rpcaddr 0.0.0.0

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