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

Quick answer: where to check Optimism uptime

If you need a quick answer, the official Optimism status page is the authoritative source for network-level availability. It tracks components like the public API, deposits, withdrawals, transaction sequencing, batch submission, and node sync. For a more granular view of RPC endpoint health, you can use third-party aggregators or your own monitoring probes.

But here's the thing: network uptime and RPC uptime are not the same. Even if the Optimism network is fully operational, the RPC provider you use might experience downtime, rate limiting, or degraded performance. This article helps you understand the difference and decide what to monitor for your dApp.

Decision guide: what to monitor for your dApp

Before you start checking uptime numbers, ask yourself what you actually need to monitor. The answer depends on your application's architecture and user expectations.

• If you're building a simple frontend that reads data: You need reliable public RPC endpoints, but you can tolerate occasional brief interruptions if you have a fallback.
• If you're running a DeFi protocol or trading bot: You need low-latency, high-availability RPC with automatic failover. A few seconds of downtime can mean missed transactions or financial loss.
• If you're indexing data or running analytics: You need consistent access to archive data and WebSocket streams. Uptime is critical, but so is data completeness.

For most production apps, we recommend a multi-provider strategy. Use a primary RPC provider and configure a fallback to another provider or a public endpoint. This way, if one provider has an incident, your app can continue operating.

What the official Optimism status page tracks

The official status page gives you a high-level view of the network's health. It typically shows the following components:

You can check this page to see if there are any ongoing incidents. However, it doesn't tell you about the performance of third-party RPC providers, which is what your app actually uses.

Why RPC uptime matters more than network uptime

Your dApp interacts with Optimism through an RPC endpoint. If that endpoint is down, your app cannot read or write data, regardless of the network's overall health. Therefore, when evaluating Optimism uptime, you should focus on the RPC provider's uptime, not just the network's.

RPC uptime is typically measured as a percentage over a period (e.g., high over the last 30 days). But raw uptime numbers can be misleading. A provider might have high uptime but still experience frequent short outages that cause request failures. You should also consider:

• Latency: How fast does the provider respond? High latency can make your app feel slow.
• Rate limits: Does the provider throttle requests? If you exceed limits, you may get errors.
• Data consistency: Does the provider return stale data? This can happen if the node is behind.
• WebSocket reliability: For real-time updates, WebSocket connections must be stable.

How to monitor Optimism RPC uptime yourself

You can set up your own monitoring to track the uptime and performance of your RPC endpoints. Here's a simple approach using a script that sends a JSON-RPC request and measures the response time.

#!/bin/bash
# Simple uptime check for Optimism RPC

RPC_URL="https://mainnet.optimism.io"

response=$(curl -s -o /dev/null -w "%{http_code} %{time_total}" -X POST \
  -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}' \
  $RPC_URL)

http_code=$(echo $response | cut -d' ' -f1)
time_total=$(echo $response | cut -d' ' -f2)

if [ "$http_code" -eq 200 ]; then
  echo "RPC is up. Response time: ${time_total}s"
else
  echo "RPC is down. HTTP code: $http_code"
fi

You can run this script periodically (e.g., every minute) and log the results. For more advanced monitoring, use a service like UptimeRobot or Grafana with Prometheus to track uptime over time and set up alerts.

What to look for in an RPC provider's uptime

When comparing RPC providers, don't just look at the headline uptime percentage. Ask for or check the following:

• Uptime over different periods: 24 hours, 7 days, 30 days, 90 days. A provider might have great 90-day uptime but recent issues.
• Incident history: How often do incidents occur? How long do they last? A provider with one long outage might be worse than one with several short blips.
• Status page: Does the provider have a public status page? How quickly do they update it?
• SLA (Service Level Agreement): Does the provider offer an SLA? What happens if they breach it?
• Redundancy: Does the provider have multiple nodes and data centers? This reduces the risk of a single point of failure.

At OnFinality, we operate dedicated nodes and RPC endpoints across multiple regions. You can check our supported networks to see if Optimism is available and review our RPC pricing for details on service levels.

Common pitfalls when relying on public RPC endpoints

Public RPC endpoints, like the one provided by Optimism, are convenient for development and light usage, but they come with limitations:

• Rate limiting: Public endpoints often have strict rate limits. If your app makes too many requests, you'll get errors like 429 Too Many Requests.
• No SLA: Public endpoints are provided as-is, with no guarantee of uptime or performance.
• Shared infrastructure: Public endpoints are used by many developers, so they can become congested during peak times.
• Limited methods: Some public endpoints may not support certain methods, like eth_getLogs with large ranges or trace_* methods.

If your app is in production, you should consider using a dedicated RPC provider that offers higher reliability and more features.

How to build resilience into your dApp

Even with a reliable RPC provider, you should design your dApp to handle RPC failures gracefully. Here are some best practices:

• Use multiple RPC endpoints: Configure your app to try a fallback endpoint if the primary one fails.
• Implement retry logic: For critical requests, retry with exponential backoff.
• Cache data: Cache frequently accessed data to reduce the number of RPC calls.
• Monitor your app: Use tools like Sentry or Datadog to track errors and performance.

Here's an example of how to set up a fallback RPC in ethers.js:

const { ethers } = require("ethers");

const primaryProvider = new ethers.JsonRpcProvider("https://mainnet.optimism.io");
const fallbackProvider = new ethers.JsonRpcProvider("https://optimism-mainnet.public.blastapi.io");

const provider = new ethers.FallbackProvider([primaryProvider, fallbackProvider], 1);

async function getBlockNumber() {
  try {
    const blockNumber = await provider.getBlockNumber();
    console.log("Block number:", blockNumber);
  } catch (error) {
    console.error("Error fetching block number:", error);
  }
}

getBlockNumber();

This way, if the primary endpoint fails, the fallback will be used automatically.

Key Takeaways

• Optimism uptime refers to the availability of the network and its core services, but RPC uptime is what directly affects your dApp.
• Check the official Optimism status page for network-level incidents, but also monitor your RPC provider's performance.
• When choosing an RPC provider, look beyond uptime percentages and consider latency, rate limits, data consistency, and WebSocket reliability.
• Public RPC endpoints are not suitable for production; use a dedicated provider like OnFinality for better reliability.
• Build resilience into your dApp by using multiple endpoints, retry logic, and caching.

Frequently Asked Questions

Q: What is the current Optimism uptime?

A: The official status page shows the current status of Optimism components. For historical uptime, you can check third-party aggregators or your own monitoring data.

Q: How is Optimism uptime calculated?

A: Uptime is typically calculated as the percentage of time a service is operational over a given period. For example, high uptime means the service was down for less than 43 minutes in a 30-day month.

Q: Does Optimism have an SLA?

A: The Optimism network itself does not offer an SLA for its public API. However, RPC providers like OnFinality may offer SLAs for dedicated services.

Q: What should I do if the Optimism public API is down?

A: If the public API is down, you can switch to a third-party RPC provider. OnFinality offers reliable Optimism RPC endpoints; check our supported networks for details.

Q: How can I get alerts for Optimism downtime?

A: You can set up your own monitoring using tools like UptimeRobot or Grafana, or subscribe to status page notifications from Optimism or your RPC provider.