Blockchain MCP Server

4byte

Retrieve Ethereum function signatures by inputting a 4-byte selector, enabling developers to decode and understand smart contract interactions using data from 4byte.directory.

Instructions

Get function signatures for the given selector from 4byte.directory

Input Schema

Name	Required	Description	Default
`selector`	Yes	Function selector (4-byte hex), e.g., '0xa9059cbb' or 'a9059cbb'

Input Schema (JSON Schema)

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "additionalProperties": false,
  "properties": {
    "selector": {
      "description": "Function selector (4-byte hex), e.g., '0xa9059cbb' or 'a9059cbb'",
      "type": "string"
    }
  },
  "required": [
    "selector"
  ],
  "type": "object"
}

Install Server

HTTP connection URL

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