Our grade: 4 checks
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Write a reviewWhy it got a C
A free hosted server from Redstone Markets, a stock and ETF analytics site whose GitHub repo names one developer, Mihai Trinca. Six read-only tools give an AI assistant a ticker's returns (year to date, 1 and 5 years) and past-year risk (max drawdown, volatility, Sharpe, beta), compare 2 to 5 tickers, backtest a weighted portfolio of 2 to 20 holdings against SPY, screen by a metric, and find or open portfolios that Redstone users shared. It covers about 2,900 US-listed stocks and 1,200 US ETFs. Prices come from Massive (formerly Polygon.io) and update once a day after the US close, so nothing is real-time. Backtests rebalance every quarter, and the site says none of it is investment advice. Clients that show MCP Apps, such as ChatGPT and Claude, get a chart with each answer. The site has no privacy policy or terms page, so it doesn't say what it keeps about the tickers and portfolios you send. No advisories on record. Biggest deduction: there is no login at all, which also means there's no per-user access to revoke. The server is also closed source (the GitHub repo holds docs, client config and the agent skill) and every public commit is by one developer, so maintenance is scored one band lower.
How to connect
// ~/.cursor/mcp.json or .cursor/mcp.json (README)
{
"mcpServers": {
"redstone": {
"url": "https://redstonemarkets.com/api/mcp"
}
}
}// .vscode/mcp.json (README)
{
"servers": {
"redstone": {
"type": "http",
"url": "https://redstonemarkets.com/api/mcp"
}
}
}claude mcp add --transport http redstone https://redstonemarkets.com/api/mcpIs Redstone Markets MCP Server safe?
Is Redstone Markets MCP Server safe to use?
Redstone Markets MCP Server grades C (usable with care). There is no login: anything that can start or reach it gets its full access. Upkeep is hard to verify (closed source or a single maintainer), so pin the version you tested.
Does Redstone Markets MCP Server have known vulnerabilities?
Not in our current data: it has no open CVEs or advisories. We re-check as new ones are published.
Does Redstone Markets MCP Server support authentication?
No. It has no login of its own, so limit who and what can start it.
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