io.github.nirholas/validation-mcp-server
Ethereum Address Validator
Is the Ethereum Address Validator MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-10-31.
Validate Ethereum addresses, keys, checksums, keccak256 hashes, function selectors, ENS
needs mcp<2 probed 2026-11-14 · unchanged since 2026-10-31
A plain install of the package stops at the import below. These tool definitions are from a second install with mcp<2, started in a container with the network off, on 2026-10-31.
MCP error -32000: Connection closed ModuleNotFoundError: No module named 'mcp.server.fastmcp'. This is mcp 2.x, where FastMCP was renamed to MCPServer (from mcp
- Run it
- uvx --with 'mcp<2' validation-mcp-server@1.0.0 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- validation-mcp-server 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/nirholas/ethereum-wallet-toolkit
- Registry
- active, updated 2026-01-20 · registry entry
- Changes
- 2 recorded, reachable in 0 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
Estimates with the o200k_base tokenizer.
| Tool | o200k estimate | Share of this server |
|---|---|---|
| validate_signature | 327 | 9 % |
| validate_address | 309 | 8 % |
| validate_hex_data | 304 | 8 % |
| calculate_storage_slot | 302 | 8 % |
| validate_private_key | 282 | 7 % |
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- Ethereum Wallet Generator io.github.nirholas/ethereum-wallet-mcp · crashed on start
- Ethereum Keystore Encryption io.github.nirholas/keystore-mcp-server · crashed on start
- Ethereum & EVM Message Signing io.github.nirholas/signing-mcp-server · crashed on start
- Ethereum Transaction Builder io.github.nirholas/transaction-mcp-server · crashed on start
- Coalent io.github.nisarg-pujara-vectorlink/coalent · needs args
- io.github.nithishr/mcp-multi-poc-alpha · alive
- io.github.nithishr/mcp-multi-poc-beta · needs args
- io.github.nithishr/mcp-multi-poc-beta-script · needs args
Servers that mention validation.
- MainBook Bank Statement Converter ai.mainbook/bank-statement-converter · alive
- ai.plith/plith · alive
- SignalHarness.ai ai.signalharness/mcp · server error
- ai.smithery/DynamicEndpoints-powershell-exec-mcp-server · not found
- Branddock app.branddock/branddock · needs auth
- Locio Australian addresses au.com.locio/addresses · needs auth
- com.abundanceapis/abundance-apis · alive
- com.acuris-geo/acuris-mcp · alive
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-31 07:36 | needs mcp<2 | 1.4 s | 15 | 6.4k | 3.8k |
| 2026-10-17 06:19 | crashed on start |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The package imports FastMCP from mcp.server.fastmcp. mcp 2.0, the Python SDK of 28 July 2026, renamed FastMCP to MCPServer, and the package asks for mcp with no upper bound, so a plain install (uvx, pip) gets mcp 2.x and the server stops at the import. Installed with mcp<2, it starts and lists its tools. The fix for the publisher: pin mcp<2 in the dependencies, for example mcp>=1.2,<2, and publish a new version, or move to MCPServer as the SDK's migration guide says. Until then, run it with uvx --with 'mcp<2'.
The cause and the fix, with the code before and after: ModuleNotFoundError: No module named 'mcp.server.fastmcp'