Openholidays is answering right now. Last checked 5 min ago. It exposes 35 tools. Last commit 13 Sep 2026.
OpenHolidays 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 Openholidays 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 5 min ago.
claude mcp add openholidays --transport http https://gateway.pipeworx.io/openholidays/mcp
{
"mcpServers": {
"openholidays": {
"url": "https://gateway.pipeworx.io/openholidays/mcp"
}
}
}
[mcp_servers.openholidays]
url = "https://gateway.pipeworx.io/openholidays/mcp"
{
"mcpServers": {
"openholidays": {
"url": "https://gateway.pipeworx.io/openholidays/mcp"
}
}
}
{
"mcpServers": {
"openholidays": {
"url": "https://gateway.pipeworx.io/openholidays/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
list_countries
deep_research
discover_tools
entity_profile
forget
generate_llms_txt
public_holidays
recall
remember
resolve_entity
school_holidays
list_subdivisions
subscribe
list_subscriptions
suggest_questions
unsubscribe
validate_claim
ai_visibility_check
search_within
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://gateway.pipeworx.io/openholidays/mcp | streamable-http | answering | 96 ms | 5 min ago |
OpenAgenda MCP.
OpenRouter Models MCP.
OpenDota MCP — Dota 2 open stats.
ULID MCP.
Open Tree of Life MCP.
Smithsonian Open Access MCP.
Holidays MCP — wraps Nager.Date API (free, no auth)
Authenticated MCP Agent (Openai)
Answers built from our own checks of this server.