Alert Webhook Listener

Set up a local HTTP server to receive Nansen smart alert webhook payloads in real-time.

How It Works

Nansen smart alerts support a webhook channel type. When an alert fires, Nansen sends an HTTP POST with a JSON payload to your webhook URL. This skill sets up:

1. A local HTTP server (Node.js, zero external dependencies) that receives and displays alert payloads
2. HMAC-SHA256 signature verification so only authentic Nansen payloads are accepted
3. A public tunnel so Nansen's servers can reach your local machine

This skill does NOT create or modify alerts. It sets up the listener infrastructure and then provides a summary of what the user needs to do to start receiving alerts.

OpenClaw users: If OpenClaw is running locally on the same machine, the webhook server can forward verified alert payloads to OpenClaw's Gateway (/hooks/agent), triggering an agent turn for each alert. Set the OPENCLAW_GATEWAY_URL env var to enable this. See the OpenClaw Integration section below.

Security Warning

Before proceeding, inform the user: