Bellwether MCP runs on your own machine — the client starts it, so there is no endpoint to ping. 47 installs a week from npm. Last commit 12 Mar 2026.
Live prediction market data from Polymarket and Kalshi with VWAP pricing and reportability.
We read the source, 21 h ago · rules 3dff92dd89df
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
result = subprocess.run(
<script src="https://cdn.plot.ly/plotly-2.27.0.min.js"></script>
container.innerHTML = filteredMarkets.slice(0, 100).map(e => {
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We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add bellwether-mcp -- npx -y bellwether-mcp
{
"mcpServers": {
"bellwether-mcp": {
"args": [
"-y",
"bellwether-mcp"
],
"command": "npx"
}
}
}
[mcp_servers.bellwether-mcp]
command = "npx"
args = ["-y", "bellwether-mcp"]
{
"mcpServers": {
"bellwether-mcp": {
"args": [
"-y",
"bellwether-mcp"
],
"command": "npx"
}
}
}
{
"mcpServers": {
"bellwether-mcp": {
"args": [
"-y",
"bellwether-mcp"
],
"command": "npx"
}
}
}
This one needs environment variables set before it will start:
BELLWETHER_API_KEY (Optional API key for authenticated access).
The author declared them in the registry entry; get the values from the project itself.
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Answers built from our own checks of this server.