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AI-Powered Webhook Automation

Use an LLM to interpret incoming webhook events and trigger intelligent, context-aware responses.

20 minAdvanced

Prerequisites

  • Completed the Set Up Webhooks tutorial
  • Node.js 18+ with Express
  • An Anthropic or OpenAI API key

What You'll Build

Standard webhook handlers use rigid if/else logic — transfer events go here, updates go there. In this tutorial you'll build an AI-powered webhook responder that interprets events with an LLM, decides the best response, and executes it autonomously. Think of it as giving your webhook pipeline a brain.

Step 1 — Set Up the Webhook Server

bash
mkdir dual-ai-webhooks && cd dual-ai-webhooks
npm init -y
npm install express @anthropic-ai/sdk

Step 2 — Define the AI Decision Engine

Create a function that takes a raw webhook event and returns an action plan:

javascript
import Anthropic from '@anthropic-ai/sdk';
const anthropic = new Anthropic();

async function decideAction(event) {
  const response = await anthropic.messages.create({
    model: 'claude-sonnet-4-5-20250514',
    max_tokens: 512,
    system: "You are an event handler for a token platform.
Given a webhook event, decide the appropriate response.
Return JSON with:
- "action": one of ["notify_owner", "update_property", "trigger_webhook", "log_only", "escalate"]
- "reason": why you chose this action
- "params": any parameters needed to execute the action

Rules:
- Transfers over 100 tokens: escalate to admin
- Property changes on premium templates: notify the owner
- Failed actions: log and retry once
- Suspicious patterns (>10 transfers/minute): escalate immediately",
    messages: [{
      role: 'user',
      content: JSON.stringify(event, null, 2)
    }]
  });

  return JSON.parse(response.content[0].text);
}

Step 3 — Build Action Executors

Implement handlers for each action the AI can decide on:

javascript
const actionExecutors = {
  async notify_owner({ object_id, message }) {
    const obj = await dualFetch("/objects/" + object_id + "");
    await dualFetch('/notifications/send', {
      method: 'POST',
      body: JSON.stringify({
        recipient: obj.owner,
        title: 'Token Activity Alert',
        body: message
      })
    });
  },

  async update_property({ object_id, properties }) {
    await dualFetch("/objects/" + object_id + "", {
      method: 'PATCH',
      body: JSON.stringify({ properties })
    });
  },

  async escalate({ event, reason }) {
    await dualFetch('/notifications/send', {
      method: 'POST',
      body: JSON.stringify({
        recipient: process.env.ADMIN_WALLET,
        title: 'ESCALATION: ' + reason,
        body: JSON.stringify(event)
      })
    });
  },

  async log_only({ event, reason }) {
    console.log('[AI Decision]', reason, event.event_type);
  }
};

Step 4 — Wire It Together

javascript
import express from 'express';
const app = express();
app.use(express.json());

app.post('/webhooks/ai', async (req, res) => {
  const event = req.body;
  res.status(200).json({ received: true }); // ACK immediately

  try {
    const decision = await decideAction(event);
    console.log("[AI] " + event.event_type + " → " + decision.action + ": " + decision.reason + "");

    const executor = actionExecutors[decision.action];
    if (executor) {
      await executor({ ...decision.params, event });
    }
  } catch (err) {
    console.error('AI decision failed:', err.message);
    // Fall back to logging
    await actionExecutors.log_only({
      event, reason: 'AI decision error — logged for review'
    });
  }
});

app.listen(3000, () => console.log('AI webhook responder on :3000'));

Step 5 — Register the Webhook

bash
curl -X POST https://gateway-48587430648.europe-west6.run.app/webhooks \
  -H "Authorization: Bearer $DUAL_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
    "webhook": {
      "url": "https://your-server.com/webhooks/ai",
      "events": ["object.transferred", "object.updated", "action.failed"],
      "active": true
    }
  }'
Latency Tip: Always ACK the webhook immediately (200 OK) before running the AI decision. DUAL expects a response within 5 seconds. Process the event asynchronously after acknowledging receipt.
Companion Repo: Get the full working source code for this tutorial at github.com/DualOrg/dual-ai-webhooks — clone it, add your API keys, and run it locally in minutes.

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