Install Countersign in Claude Code
claude mcp add countersign -e COUNTERSIGN_URL=... -e COUNTERSIGN_API_KEY=... -- npx -y @countersign/mcp{
"mcpServers": {
"countersign": {
"command": "npx",
"args": [
"-y",
"@countersign/mcp"
],
"env": {
"COUNTERSIGN_URL": "...",
"COUNTERSIGN_API_KEY": "..."
}
}
}
}Replace each ... with your own value.
Frequently asked questions
What does the Countersign MCP server do?
Kill switch + spend guard for AI agents that spend money, across every wallet vendor at once.
Is the Countersign MCP server free?
The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.
Does Countersign run locally or remotely?
Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.
How do I add Countersign to Claude Code?
Run: claude mcp add countersign -e COUNTERSIGN_URL=... -e COUNTERSIGN_API_KEY=... -- npx -y @countersign/mcp
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