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OptimistFi
com.optimistfi/optimistfi in the official MCP registry.
Endpoint https://mcp.optimistfi.com/mcp. Source: github.com/OptimistFi/optimistfi-mcp.
The registry describes it as: Perpetual futures across 40 venues, perps prop firms and sourced theses on 6,100+ US stocks.
On 2026-10-28 we read its 17 tools, but part of what it advertised was cut before our rules saw it: a description or schema past the size we read, more tools than we read, or a tool list split across pages. Nothing in the part we read matched, but the rest was not checked: this is not a clean result.
Tools it advertises
what_changed resolve_entity get_calendar get_capital_returns get_filings get_congress_trades answer get_perps get_perps_history get_prop_firms get_perps_desk get_perps_market compare get_track_record get_thesis get_thesis_impact get_insider_trades
Rather than checking back: subscribe to this server's tool changes (a feed, no account and no address needed). Tool names and dates only, never what a tool says.
Run this server? Show the check in your README
The badge reflects the latest read: 
[](https://lazaretto.dev/mcp-registry/com-optimistfi-optimistfi)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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