Overview
Rebar Data provides a WebSocket interface for real-time monitoring of Bitcoin's mempool and chain activity. Powered by a self-hosted mempool.space instance, it follows the same WebSocket API conventions.
What You Can Monitor
- Mempool — New transactions, fee rate changes, mempool statistics
- Blocks — New block notifications, chain reorganizations
- Addresses — Activity on specific addresses, UTXO changes
- Transactions — Confirmation status updates
When to Use WebSocket
| Scenario | Recommended |
|---|---|
| Reacting to events as they happen | WebSocket |
| Monitoring addresses for payments | WebSocket |
| Real-time dashboards | WebSocket |
| Fee rate monitoring | WebSocket |
| Historical data queries | REST API |
| One-off lookups | REST API |
Use Cases
- Payment processing — Monitor addresses and confirm transactions in real-time
- Trading bots — React to mempool conditions and fee changes with minimal latency
- Alerting — Trigger alerts on on-chain events, large transactions, or fee spikes
- Live dashboards — Real-time mempool, mining, and network health visualization
note
WebSocket connections do not support API key authentication. See Authentication for details.