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POST
/
efb0a5eccd2caa5135eb54eba6f7f300
web3_sha3
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "web3_sha3",
  "id": 1,
  "params": [
    "0x436861696E737461636B"
  ]
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}
Optimism API method web3_sha3 computes the Keccak-256 hash of the given data. This method is a utility function often used in Optimism for generating hashes of arbitrary data, which is a common requirement for various cryptographic operations. This example computes Keccak-256 for the value Chainstack. Chainstack in hex: 0x436861696E737461636B.
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​
Parameters

  • data — the data to hash, typically provided as a hexadecimal string.

​
Response

  • result — the Keccak-256 hash of the input data, returned as a hexadecimal string.

​
Use case

The web3_sha3 method is essential for:
  • Generating identifiers or hashes for on-chain data storage or referencing.
  • Creating cryptographic proofs that require a hash of data.
  • Developers needing to perform off-chain hash calculations that match the Optimism network’s hashing algorithm.

Body

application/json
​
jsonrpc
string
default:2.0
required
​
method
string
default:web3_sha3
required
​
id
integer
default:1
required
​
params
string[]
required

Response

200 - application/json

The SHA3 result of the given data

​
jsonrpc
string
​
id
integer
​
result
string

The Keccak-256 hash of the input data.

Last modified on May 18, 2026