Ethereum Address Validator

io.github.nirholasPublished by GitHub account nirholasv1.0.0Updated Oct 28, 2026

Validate Ethereum addresses, keys, checksums, keccak256 hashes, function selectors, ENS

VerifiedSTDIODesktop onlyFinanceDeveloper ToolsSecurity & Monitoring

Overview

AI-generated overview

Local MCP server that lets an assistant validate Ethereum addresses, private keys, signatures and hex data, and compute checksums, keccak256 hashes and…

What you can do
  • Validate Ethereum addresses with EIP-55 checksum checks, compare addresses and batch-validate lists
  • Validate private keys, ECDSA signature components and arbitrary hex data
  • Convert addresses to checksummed form and derive addresses from private or public keys
  • Compute keccak256 hashes and encode or decode 4-byte function selectors
  • Check vanity address criteria, validate ENS name format offline and calculate contract storage slots
  • Read bundled reference resources such as the EIP-55 spec, secp256k1 constants and a selector database
When to use it
Useful when working on Ethereum tooling, smart contract interaction or wallet-related tasks where an assistant needs to check address formats, checksums, selectors or key-derived addresses before acting on them.
Requirements
Runs locally over stdio as a Python package (validation-mcp-server) installed with pip or run via uvx; no authentication, environment variables or headers are declared. Desktop client configuration is required.
Before you install
Several tools take private keys as input, so key material passes through the assistant and the local process; the README states keys are not logged or persisted and memory is cleared, but that is the provider's own claim. Validation is offline and does not confirm on-chain ownership or ENS resolution.

Installation

In SourceWeft

  1. Open Ethereum Address Validator in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

Validation MCP Server

[PyPI] [MCP Registry]

A Model Context Protocol (MCP) server providing comprehensive Ethereum address validation, private key validation, checksum conversion, and cryptographic utilities.

Features

Tools (15 total)

  1. validate_address - Comprehensive Ethereum address validation with EIP-55 checksum verification
  2. validate_private_key - Private key validation with range checking
  3. to_checksum_address - Convert any address to EIP-55 checksummed format
  4. derive_address_from_private_key - Derive Ethereum address from private key
  5. derive_address_from_public_key - Derive address from public key (compressed/uncompressed)
  6. validate_signature - Validate ECDSA signature components (v, r, s)
  7. validate_hex_data - Validate arbitrary hex data for Ethereum use
  8. compare_addresses - Compare two addresses for equality
  9. batch_validate_addresses - Validate multiple addresses at once
  10. generate_vanity_check - Check if address matches vanity criteria
  11. keccak256_hash - Compute Keccak-256 hash
  12. encode_function_selector - Encode function signature to 4-byte selector
  13. decode_function_selector - Decode selector to function signature
  14. validate_ens_name - Validate ENS name format (offline)
  15. calculate_storage_slot - Calculate contract storage slot positions

Resources

  • validation://eip55-specification - EIP-55 checksum specification
  • validation://secp256k1-constants - Curve parameters
  • validation://function-selectors-db - Common function selectors (500+)
  • validation://address-patterns - Known address patterns
  • validation://known-weak-keys - Weak key information

Prompts

  • Address validation workflow
  • Key security audit
  • Data encoding helper
  • Contract interaction preparation

Installation

bash
pip install -e .

Usage

As MCP Server

Add to your Claude Desktop configuration:

json
{  "mcpServers": {    "validation-mcp-server": {      "command": "validation-mcp-server"    }  }}

Example Tool Calls

python
# Validate an addressresult = await validate_address("0x5aaeb6053f3e94c9b9a09f33669435e7ef1beaed")
# Derive address from private keywallet = await derive_address_from_private_key(    "0x4c0883a69102937d6231471b5dbb6204fe5129617082792ae468d01a3f362318")
# Compute function selectorselector = await encode_function_selector("transfer(address,uint256)")# Returns: 0xa9059cbb

Security Notes

  • Private keys are never logged or persisted
  • All sensitive operations clear memory after use
  • Uses established cryptographic libraries

License

MIT

Source: validation-mcp-server/README.md at commit dabb599

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v1.0.0LatestSep 16, 2026

Score

40% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.