Kill switch + spend guard for AI agents that spend money, across every wallet vendor at once.
Connect Runs on your machine
claude mcp add countersign -e COUNTERSIGN_URL=<COUNTERSIGN_URL> -e COUNTERSIGN_API_KEY=<COUNTERSIGN_API_KEY> -- npx -y @countersign/[email protected]{
"mcpServers": {
"countersign": {
"command": "npx",
"args": [
"-y",
"@countersign/[email protected]"
],
"env": {
"COUNTERSIGN_URL": "<COUNTERSIGN_URL>",
"COUNTERSIGN_API_KEY": "<COUNTERSIGN_API_KEY>"
}
}
}
}{
"mcpServers": {
"countersign": {
"command": "npx",
"args": [
"-y",
"@countersign/[email protected]"
],
"env": {
"COUNTERSIGN_URL": "<COUNTERSIGN_URL>",
"COUNTERSIGN_API_KEY": "<COUNTERSIGN_API_KEY>"
}
}
}
}{
"servers": {
"countersign": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@countersign/[email protected]"
],
"env": {
"COUNTERSIGN_URL": "<COUNTERSIGN_URL>",
"COUNTERSIGN_API_KEY": "<COUNTERSIGN_API_KEY>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
COUNTERSIGN_URLRequired | Base URL of the Countersign Core to govern (hosted or self-hosted). |
COUNTERSIGN_API_KEYRequired, secret | API key for the Core (self-serve one at https://app.countersign.network/start or POST /signup). |
Details
| Package | @countersign/[email protected] (NPM, stdio) |
| First published | 23 Aug 2026 |
| Last updated | 23 Aug 2026 |
| Registry name | io.github.countersign-network/countersign |
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