keccak256 of hex or utf8 data API

Compute the keccak256 hash of a UTF-8 string or 0x-hex bytes (the EVM's hash for selectors, storage slots, and commitments), via viem's keccak256. Answers 'What is keccak256("hello")?','What is the hash of these bytes?'.

Price$0.01per request

MethodPOST

Route/v1/evm/keccak

StatusLive

MIME typeapplication/json

Rate limit60/minute

CacheNo cache

evmkeccakkeccak256hashsha3hexutf8

API URLhttps://x402.hexl.dev/v1/evm/keccak

Integration docs

Example request

{
  "data": "hello"
}

Example response

{
  "input": "hello",
  "encoding": "utf8",
  "keccak256": "0x1c8aff950685c2ed4bc3174f3472287b56d9517b9c948127319a09a7a36deac8"
}

Input schema

{
  "type": "object",
  "required": [
    "data"
  ],
  "properties": {
    "data": {
      "type": "string",
      "examples": [
        "hello",
        "0x1234"
      ]
    },
    "encoding": {
      "type": "string",
      "enum": [
        "utf8",
        "hex"
      ],
      "description": "Defaults to hex if data is 0x-prefixed, else utf8."
    }
  },
  "examples": [
    {
      "data": "hello"
    },
    {
      "data": "0x1234",
      "encoding": "hex"
    }
  ]
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}