I built Cointer because I wanted a simple way to watch a wallet without setting up a full node or using an app that needs an account (my cold wallet does not support notifications).
You give it a BTC or ETH address, and it watches the blockchain for you. When that address gets a deposit, you get a notification. No accounts, no passwords. Just a personal key that ties everything together so it works from your phone (mobile app) to your desktop (web-app).
It also builds a dashboard from up to 90 days of transactions, showing totals by day, week, and month, broken down by address and asset. There's an activity page with full deposit history too.
Notifications can go to mobile push, ntfy, Discord, Slack, or email.
I maintain a couple other open source projects (Termix, an SSH software with about 14k GitHub stars) and picked up some hosting sponsors, which is what let me run this beta. Right now it's capped at around 150 BTC wallets and a few thousand ETH addresses, so if you sign up and run into issues, thats why.
It's free and will stay free. Only BTC and ETH for now, more chains might come later depending on how this goes (donations are what allow me to keep it going).
Happy to answer anything about how it works or why I built it this way.
KellyCriterion•1h ago
You should also implement the reverse way: Get notified when a given BTC wallet is starting to move out some coins - then you could do "whale watching" :-D
bugattiguy527•1h ago
You give it a BTC or ETH address, and it watches the blockchain for you. When that address gets a deposit, you get a notification. No accounts, no passwords. Just a personal key that ties everything together so it works from your phone (mobile app) to your desktop (web-app).
It also builds a dashboard from up to 90 days of transactions, showing totals by day, week, and month, broken down by address and asset. There's an activity page with full deposit history too.
Notifications can go to mobile push, ntfy, Discord, Slack, or email.
I maintain a couple other open source projects (Termix, an SSH software with about 14k GitHub stars) and picked up some hosting sponsors, which is what let me run this beta. Right now it's capped at around 150 BTC wallets and a few thousand ETH addresses, so if you sign up and run into issues, thats why.
It's free and will stay free. Only BTC and ETH for now, more chains might come later depending on how this goes (donations are what allow me to keep it going).
Web-app: https://app.cointer.app/ GitHub (open source): https://github.com/Cointer-App Android (beta, App Store listing only for now): https://gist.github.com/LukeGus/e9d3c14fd935ee7964a9ef78d926... Apple (TestFlight): https://gist.github.com/LukeGus/267f9d6efb1c24f0aae08d05a0b1...
Happy to answer anything about how it works or why I built it this way.