Sourcify

decodeFunctionSelectors

Free

Decode EVM function selectors (4 bytes, or the first 4 bytes of calldata) and event topics (32 bytes) into readable signatures such as transfer(address,uint256), using the Sourcify signature database. Use it to understand what a transaction or a signature request will actually call, e.g., spotting a hidden approve or setApprovalForAll.

Try it

Open in playground
kirha tools run sourcify_decodeFunctionSelectors \
  --input '{
    "selectors": [
      "<selectors>"
    ]
  }'

Uses the key saved by kirha auth login.

  • selectorsstring[], required, 1 to 20 items

    Function selectors or calldata (0x + at least 8 hex), or event topics (0x + 64 hex)