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POST
/
efb0a5eccd2caa5135eb54eba6f7f300
web3_clientVersion
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "web3_clientVersion",
  "id": 1
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}
Optimism API method web3_clientVersion retrieves the version string of the Optimism client the node is running. This method is useful for identifying the client and its version, which can be important for compatibility and debugging purposes.
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​
Parameters

This method does not require any parameters.

​
Response

  • result — the version string of the Optimism client, which typically includes the client name, version, network, platform, and other build information.

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Use case

The web3_clientVersion method is essential for:
  • Developers and system administrators needing to verify the client version for compatibility with dApps or network protocols.
  • Services that monitor and report on the distribution of client versions across the network.
  • Tools that automate interactions with Optimism nodes and require version checks to ensure proper operation.

Body

application/json
​
jsonrpc
string
default:2.0
required
​
method
string
default:web3_clientVersion
required
​
id
integer
default:1
required

Response

200 - application/json

The version of the Ethereum client

​
jsonrpc
string
​
id
integer
​
result
string

The client version string.