Service
Alerts — Crypto Wallet Push Notifications — Real-Time Blockchain Transaction Alerts
Push notifications for a crypto wallet require monitoring blockchain events in real time and routing them to millions of user devices. Architecture flow: Blockchain (Ethereum, Polygon, etc.) → Real-time events via Alchemy Webhooks or The Graph subscriptions → Notification Service (Node.js) → Event processing and user s...
// Monitor blockchain events using Alchemy Webhooks class BlockchainEventMonitor { constructor(alchemyWebhookSecret) { this.secret = alchemyWebhookSecret; } // Register webhook for all address activity async registerAddressWebhook(webhookUrl, addresses) { const response = await fetch('https://dashboard.alchemyapi.io/ap...
// Multi-platform push notification service class PushNotificationService { constructor() { this.apns = apn.Provider({ token: { key: process.env.APNS_KEY, keyId: process.env.APNS_KEY_ID, teamId: process.env.APPLE_TEAM_ID, }, production: process.env.NODE_ENV === 'production' }); this.fcm = admin.messaging(); } async sen...
// Notification settings per user interface NotificationPreferences { userId: string; // Transaction notifications receiveAlerts: boolean; // Alert on receiving any funds sendAlerts: boolean; // Alert on sending funds minReceiveAmount: number; // Only alert above threshold ($10 default) // DeFi position alerts healthFa...
Common integrations: The Graph, Alchemy/Infura, OpenZeppelin Defender, and popular wallet providers.
Clarify requirements, compliance needs, architecture risks, and launch goals.
Implement core contracts, integrations, product flows, tests, and deployment automation.
Run QA, prepare audit handoff, deploy infrastructure, and support production rollout.
Send to all registered devices simultaneously. Each device independently receives and displays the notification. The read state is synchronized through your backend — when the user opens the notification on one device, mark it as read for all devices. FCM and APNs each handle delivery to multiple tokens per user gracefully.
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