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Can I connect to ANY contract on the Ethereum mainnet using Quicknode? Or does Quicknode only support a subset of actual solidity contract endpoints using a rest API?

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Quicknode provides, besides many other services, a REST API to interact with supported blockchain networks via JSON-RPC clients. This means that Quicknode can be used as a JSON-RPC Provider. For supported chains refer to their documentation, here.

In order for a software application to interact with the Ethereum blockchain - either by reading blockchain data or sending transactions to the network - it must connect to an Ethereum node. Every Ethereum client implements a JSON-RPC specification...

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In order to interact with a smart contract, e.g. call a function for reading state, an client needs to send an eth_call method JSON-RPC request.

So now back to your question.

Can I connect to ANY contract on the Ethereum mainnet using Quicknode?

If you mean by "connecting to a contract", to interact with a contract: YES, you can interact with any contract via Quicknode calling their respective API endpoint.

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  • Thanks @norym. So if I wish to make a swap on Balancer, I can use Quicknode and just provide an appropriate JSON request payload for the contract function I want to call?
    – Philip hughes
    Commented May 11, 2023 at 21:48
  • I do not know about Balancer and I think if Balancer provides swaps for tokens, it will likely provide a dApp on which you can connect with your wallet in order to interact with the contract/swap your tokens. But, yes you will be able to interact with Balancer's contracts as I explained.
    – norym
    Commented May 11, 2023 at 22:03
  • Btw just for clarity, when you say Quicknode provides a REST API for interacting with supported blockchain networks via JSON-RPC, does this mean I make an API request (say HTTP) and then they in turn create a request for the JSON-RPC? I never need to create a JSON-RPC request myself?
    – Philip hughes
    Commented May 13, 2023 at 20:39
  • Correct, you do not need to care about the JSON-RPC request handling.
    – norym
    Commented May 14, 2023 at 8:13
  • Awesome. And if I use a library like web3js then I am in fact directly constructing the JSON-RPC calls again?
    – Philip hughes
    Commented May 14, 2023 at 14:24

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