How do you check Arbitrum One uptime and what does it mean for your dApp?

When you search for "Arbitrum One uptime," you're likely trying to answer one of two questions: is the network healthy right now, and can I rely on it for my application? The official Arbitrum status page is the primary source for network health, but it only tells part of the story. Your dApp's reliability also depends on the RPC endpoints you use to interact with the chain. This guide explains how to read Arbitrum's uptime metrics, what they mean for your application, and how to evaluate RPC infrastructure to keep your service running smoothly.

Quick Recommendation: What to Check Before You Build

Before you deploy a production dApp on Arbitrum One, you should establish a clear picture of network health and your own infrastructure requirements. Here's a practical checklist:

1. Monitor the official status page for sequencer and batch poster status. These components are critical for transaction inclusion and finality.
2. Understand the difference between network uptime and RPC uptime. The chain can be healthy while a public RPC endpoint is overloaded or down.
3. Choose an RPC provider with redundancy and failover. A single endpoint, even from a reliable provider, is a single point of failure.
4. Set up your own monitoring alerts for RPC latency and error rates, not just the status page.
5. Plan for planned maintenance windows that may affect sequencer or RPC availability.

If you're evaluating RPC providers, compare their uptime guarantees, but also look at how they handle failover, load balancing, and geographic distribution. For a deeper dive into provider selection, see our guide on choosing an RPC provider.

What Does the Arbitrum Status Page Actually Track?

The official status page groups components by network (ARB1, NOVA, SEPOLIA) and shows the operational status of each. For Arbitrum One, the key components are:

• Sequencer: Orders transactions and produces blocks. If this is down, new transactions cannot be included.
• Batch Poster: Posts transaction data to Ethereum L1. Delays here can affect data availability and finality.
• Validator: Asserts the state of the rollup and participates in dispute resolution. Issues here are rare but critical.
• Feed: Distributes real-time transaction data to nodes. If the feed is degraded, RPC nodes may lag.
• Arbiscan: The block explorer. Its uptime is separate from the chain itself.

The status page shows a percentage uptime for each component over the last 90 days. For example, you might see "Sequencer 100% uptime" or "Arbiscan high1% uptime." These numbers are useful for historical context, but they don't guarantee future performance.

Why Network Uptime Isn't the Same as RPC Uptime

A common misconception is that if the Arbitrum network is operational, your RPC calls will always succeed. In reality, your dApp's availability depends on the RPC endpoint you use. Public RPC endpoints can be rate-limited, overloaded, or temporarily unavailable even when the chain is healthy.

Consider this: the sequencer might be processing blocks fine, but if your RPC provider's infrastructure has a regional outage, your users will see errors. That's why you need to evaluate RPC providers based on their own uptime and reliability, not just the network's status.

When choosing an RPC provider, look for:

• Multiple endpoints with automatic failover
• Global load balancing to route requests to the nearest healthy node
• Transparent uptime reporting and status pages
• Scalable rate limits that match your traffic patterns

OnFinality offers dedicated nodes and a public RPC API service designed for production workloads, with redundancy built in. You can check our supported networks to see if Arbitrum One is available.

How to Monitor Arbitrum One Uptime Yourself

Relying solely on the status page is not enough for production applications. You should implement your own monitoring to detect issues early. Here's a simple approach using a health check script that pings an RPC endpoint and logs the response time.

#!/bin/bash
# Simple RPC health check for Arbitrum One
ENDPOINT="https://arbitrum.llamarpc.com"

curl -s -o /dev/null -w "%{http_code} %{time_total}\n" \
  -X POST $ENDPOINT \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

This script returns the HTTP status code and the total time taken. You can run it periodically and alert if the response time exceeds a threshold or if the status code is not 200. For more advanced monitoring, consider using a service like UptimeRobot or Grafana with Prometheus.

What to Do When Arbitrum One Has an Incident

If the status page shows an incident, or if you notice RPC errors, here's a troubleshooting path:

1. Check the status page for official notices. Look for planned maintenance or ongoing incidents.
2. Test multiple RPC endpoints to isolate whether the issue is network-wide or provider-specific.
3. Switch to a backup RPC provider if your primary is down. This is why having multiple providers is recommended.
4. Monitor transaction finality using a tool like Arbiscan. If the sequencer is down, transactions may be delayed.
5. Communicate with your users if the issue affects your dApp's functionality.

For a more detailed troubleshooting guide, see our RPC troubleshooting article, which covers common failure modes and how to diagnose them.

How to Evaluate RPC Providers for Arbitrum One

When comparing RPC providers, don't just look at uptime percentages. Use a table like the one below to evaluate your options.

Consider your workload:

• High-traffic dApps need providers with high rate limits and automatic scaling.
• Indexers need archive data and WebSocket support for real-time updates.
• Small projects may be fine with a free tier, but be aware of rate limits.

OnFinality's RPC pricing is transparent, and you can start with a free tier to test performance.

Key Takeaways

• Arbitrum One uptime is tracked on the official status page, but it only covers core network components.
• Your dApp's reliability depends on both network health and RPC provider uptime.
• Monitor RPC endpoints yourself to detect issues early.
• Choose an RPC provider with failover, scalability, and transparent uptime reporting.
• OnFinality offers robust RPC infrastructure for Arbitrum One and other networks.

Frequently Asked Questions

Q: Where can I check Arbitrum One uptime? A: The official status page is at status.arbitrum.io. It shows real-time status and 90-day uptime for core components.

Q: What does 100% uptime on the status page mean? A: It means the component has been operational for the entire reporting period. However, it doesn't guarantee future performance.

Q: How can I improve my dApp's uptime on Arbitrum One? A: Use multiple RPC endpoints, implement failover, and monitor your infrastructure. Consider a dedicated node or a reliable RPC provider.

Q: Does OnFinality support Arbitrum One? A: Yes, OnFinality supports Arbitrum One. Check our network page for details.

Q: What is the difference between network uptime and RPC uptime? A: Network uptime refers to the blockchain's core components, while RPC uptime refers to the availability of the API endpoints you use to interact with the chain. Both are important.