io.github.SMABoundless/unpaywall
Unpaywall
Is the io.github.SMABoundless/unpaywall MCP server down? No. Installed with mcp<2, it started and listed its tools on 2026-11-01.
Open-access availability for 120M+ scholarly articles via the Unpaywall API
needs mcp<2 probed 2026-11-14 · unchanged since 2026-11-01
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 2026-11-01.
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' unpaywall-mcp-server@1.0.1 (stdio, probed in a container with the network off)
- Host
- pypi.org
- Reports itself as
- Unpaywall 1.30.0
- Capabilities
- experimental, prompts, resources, tools
- Repository
- https://github.com/SMABoundless/unpaywall-mcp-server.git
- Registry
- active, updated 2026-07-04 · 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 |
|---|---|---|
| unpaywall_search | 209 | 44 % |
| unpaywall_lookup | 126 | 27 % |
| unpaywall_export_ris | 76 | 16 % |
| unpaywall_export_bibtex | 61 | 13 % |
Compare this server with others.
More servers
Other registry entries on pypi.org, the ones next to this name; all of them.
- ChimeraForge io.github.Sahil170595/chimeraforge · crashed on start
- patchwork — Codebase Conventions for AI Agents io.github.SaiNarayana-B/patchwork · crashed on start
- io.github.SK-DEV-AI/websearch · alive
- io.github.SMABoundless/crossref · needs mcp<2
- io.github.SMABoundless/orcid · needs mcp<2
- io.github.SMABoundless/scopus · needs mcp<2
- rmbr io.github.SRock44/rmbr · needs args
- Waypoint io.github.STiFLeR7/waypoint-mcp · alive
Servers that mention unpaywall.
- io.github.cyanheads/pubmed-mcp-server · alive
- Unpaywall io.github.pipeworx-io/unpaywall · alive
- io.github.penny4nonsense/mcp-scholaris · alive
- io.github.mlintangmz2765/scholar · needs mcp<2
- io.github.mrfentmen/unpaywall-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 |
|---|---|---|---|---|---|
| 2026-11-01 08:18 | needs mcp<2 | 1.9 s | 4 | 788 | 472 |
| 2026-10-18 06:43 | 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'