Cactus is answering right now. Last checked 14 min ago. It exposes 33 tools. Last commit 18 Sep 2026.
NCI CACTUS Chemical Identifier Resolver MCP.
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 Cactus 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 14 min ago.
claude mcp add cactus --transport http https://gateway.pipeworx.io/cactus/mcp
{
"mcpServers": {
"cactus": {
"url": "https://gateway.pipeworx.io/cactus/mcp"
}
}
}
[mcp_servers.cactus]
url = "https://gateway.pipeworx.io/cactus/mcp"
{
"mcpServers": {
"cactus": {
"url": "https://gateway.pipeworx.io/cactus/mcp"
}
}
}
{
"mcpServers": {
"cactus": {
"url": "https://gateway.pipeworx.io/cactus/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
resolve
resolve_entity
scan_competitor_ai_presence
scan_dependency
bet_research
compare_entities
deep_research
discover_tools
entity_profile
forget
generate_llms_txt
identify
recall
remember
subscribe
list_subscriptions
suggest_questions
unsubscribe
validate_claim
ai_visibility_check
search_within
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://gateway.pipeworx.io/cactus/mcp | streamable-http | answering | 79 ms | 14 min ago |
Bioregistry — meta-registry of biomedical identifier prefixes
Securities-identifier validation MCP (ISIN / CUSIP).
MCP server for DECIMER image-to-SMILES chemical structure recognition
PermID MCP — Refinitiv / LSEG Permanent Identifier (free, requires API key)
Verify claims, resolve FIGI identity, extract claims, and sign x402 delivery receipts over MCP.
GLEIF MCP — Global Legal Entity Identifier Foundation (free, no auth)
JS identifier charset, value discarded
The MCP-native bridge to ERC-8004 (on-chain agent identity/reputation/validation): resolve registrat
Answers built from our own checks of this server.