crossref is answering right now. Last checked 12 min ago. It exposes 34 tools. Last commit 18 Sep 2026.
Crossref MCP — wraps the Crossref REST API (academic papers, free, no auth)
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 8 August 2026. No other catalogue keeps this.
Today is the operative word: we check crossref every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.
claude mcp add crossref --transport http https://gateway.pipeworx.io/crossref/mcp
{
"mcpServers": {
"crossref": {
"url": "https://gateway.pipeworx.io/crossref/mcp"
}
}
}
[mcp_servers.crossref]
url = "https://gateway.pipeworx.io/crossref/mcp"
{
"mcpServers": {
"crossref": {
"url": "https://gateway.pipeworx.io/crossref/mcp"
}
}
}
{
"mcpServers": {
"crossref": {
"url": "https://gateway.pipeworx.io/crossref/mcp"
}
}
}
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
polymarket_arbitrage
polymarket_edge_tracker
polymarket_edges
polymarket_fill_risk
polymarket_kalshi_spread
ask_pipeworx
ask_pipeworx_beta
ask_pipeworx_grounded
pipeworx_feedback
pipeworx_trending
recent_alerts
recent_changes
scan_competitor_ai_presence
scan_dependency
bet_research
compare_entities
deep_research
discover_tools
entity_profile
forget
generate_llms_txt
get_journal
recall
remember
resolve_entity
subscribe
list_subscriptions
suggest_questions
unsubscribe
validate_claim
ai_visibility_check
search_within
get_work
search_works
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://gateway.pipeworx.io/crossref/mcp | streamable-http | answering | 117 ms | 12 min ago |
Crates.io MCP — wraps the crates.io REST API v1 (free, no auth)
RxNorm MCP — wraps the NLM RxNav REST API (free, no auth)
npm MCP — wraps the npm Registry API (free, no auth)
Chess.com MCP — wraps the Chess.com public API (free, no auth)
Wikipedia MCP — wraps Wikipedia REST API (free, no auth)
Iconify MCP — wraps the Iconify public API (free, no auth)
SBIR MCP — wraps the SBIR.gov public API (free, no auth)
Rick and Morty MCP — wraps the Rick and Morty API (free, no auth)
Answers built from our own checks of this server.