DEPRECATED: hosted 402Sentinel retired 2026-10-31. Client for x402 payment-safety checks.
Connect Runs on your machine
claude mcp add 402sentinel-mcp -e CLIENT_PRIVATE_KEY=<CLIENT_PRIVATE_KEY> -e SENTINEL_URL=<SENTINEL_URL> -- npx -y @kaditang/[email protected]{
"mcpServers": {
"402sentinel-mcp": {
"command": "npx",
"args": [
"-y",
"@kaditang/[email protected]"
],
"env": {
"CLIENT_PRIVATE_KEY": "<CLIENT_PRIVATE_KEY>",
"SENTINEL_URL": "<SENTINEL_URL>"
}
}
}
}{
"mcpServers": {
"402sentinel-mcp": {
"command": "npx",
"args": [
"-y",
"@kaditang/[email protected]"
],
"env": {
"CLIENT_PRIVATE_KEY": "<CLIENT_PRIVATE_KEY>",
"SENTINEL_URL": "<SENTINEL_URL>"
}
}
}
}{
"servers": {
"402sentinel-mcp": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@kaditang/[email protected]"
],
"env": {
"CLIENT_PRIVATE_KEY": "<CLIENT_PRIVATE_KEY>",
"SENTINEL_URL": "<SENTINEL_URL>"
}
}
}
}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 |
|---|---|
CLIENT_PRIVATE_KEYRequired, secret | A Base wallet holding USDC on-chain (no gas needed) — pays per call, from $0.002. |
SENTINEL_URLRequired | Required since 0.9.0 (the hosted service was retired on 2026-10-31): base URL of a 402Sentinel server you trust. 402sentinel.com is refused. |
Details
| Package | @kaditang/[email protected] (NPM, stdio) |
| First published | 19 Oct 2026 |
| Last updated | 19 Oct 2026 |
| Registry name | io.github.kaditang/402sentinel-mcp |
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