alchemy-webhooks-events

name	alchemy-webhooks-events
description	Implement Alchemy Notify webhooks for real-time blockchain event notifications. Use when tracking wallet activity, monitoring mined transactions, watching smart contract events, or building real-time dApp features. Trigger: "alchemy webhook", "alchemy notify", "alchemy events", "alchemy address activity", "alchemy real-time notifications".
allowed-tools	Read, Write, Edit, Bash(curl:*)
version	1.0.0
license	MIT
author	Jeremy Longshore <[e-mail]>
tags	["saas","blockchain","web3","alchemy","webhooks"]
compatible-with	claude-code

Alchemy Webhooks & Events (Notify API)

Overview

Alchemy Notify provides real-time push notifications for on-chain events. Instead of polling, receive webhook callbacks for wallet activity, mined transactions, dropped transactions, and smart contract events.

Webhook Types

Type	Trigger	Use Case
Address Activity	ETH/token transfer to/from address	Wallet notifications
Mined Transaction	Transaction confirmed on-chain	Payment confirmation
Dropped Transaction	Transaction removed from mempool	Failed tx alerting
NFT Activity	NFT transfer events	Marketplace notifications
Custom Webhook	GraphQL-defined filter	Complex event tracking

Instructions

Step 1: Create Webhook via Dashboard or API

# Create Address Activity webhook via Alchemy API
curl -X POST "https://dashboard.alchemy.com/api/create-webhook" \
  -H "X-Alchemy-Token: ${ALCHEMY_AUTH_TOKEN}" \
  -H "Content-Type: application/json" \
  -d '{
    "network": "ETH_MAINNET",
    "webhook_type": "ADDRESS_ACTIVITY",
    "webhook_url": "https://your-app.com/webhooks/alchemy",
    "addresses": [
      "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
    ]
  }'

Step 2: Webhook Handler with Signature Verification

// src/webhooks/alchemy-handler.ts
import express from 'express';
import crypto from 'crypto';

const router = express.Router();

router.post('/webhooks/alchemy',
  express.raw({ type: 'application/json' }),
  async (req, res) => {
    
     signature = req.[]  ;
     (!(req..(), signature)) {
       res.().({ :  });
    }

     event = .(req..());
     (event);
    res.().({ :  });
  }
);

 ():  {
   signingKey = process..!;
   hmac = crypto.(, signingKey);
  hmac.(body, );
   digest = hmac.();
   crypto.(.(signature), .(digest));
}