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API Latency Tester

Test API endpoint latency from 3 world regions

TL;DR:

API Latency Checker measures HTTP latency from 3 regions (MSK, EU, US). Detailed timings: DNS lookup, SSL handshake, TTFB, Content Transfer. Useful for third-party API SLA auditing and pinpointing where exactly a request slows down in the chain.

https://api.github.com https://jsonplaceholder.typicode.com/posts/1 https://httpbin.org/get
3 RegionsRussia, Europe, USA
Detailed BreakdownDNS, Connect, SSL, TTFB
ComparisonFastest and slowest region
Real HTTPFull request, not ICMP ping

Why measure API latency?

API latency directly affects UX. If your API responds in 50ms in Moscow but 800ms in the US, users in that region will suffer. Multi-region testing reveals such issues.

Multi-region

Simultaneous check from Moscow, Germany, and USA.

Detailed Timings

DNS, TCP Connect, SSL Handshake, TTFB and download time for Moscow region.

Visual Comparison

Region cards with fastest and slowest badges.

SSRF Protection

DNS pinning and private IP range blocking.

Common Mistakes

Testing from one region onlyLatency heavily depends on geography. CDN misses and routing can double response time in distant regions.
Ignoring DNS/SSL overheadDNS resolution and TLS handshake can take 100-300ms. Optimize with DNS prefetch and session resumption.
No regular monitoringA one-time check won't show degradation. Set up monitoring to catch latency increases.
Confusing Ping and HTTP latencyICMP ping doesn't account for DNS, SSL, and server processing. HTTP latency is always higher and closer to reality.

Best Practices

Use a CDNA CDN reduces distance to the user and decreases TTFB for static and dynamic content.
Optimize DNSUse fast DNS providers (Cloudflare, Google DNS) and enable DNS prefetch.
Enable Keep-AlivePersistent connections eliminate repeated TCP handshakes and reduce latency for subsequent requests.
Set up monitoringRegularly track latency from multiple regions to quickly respond to degradation.
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Frequently Asked Questions

What is API Latency Tester?

A tool that measures HTTP request latency to your API from 3 world regions: Russia (Moscow), Europe (Germany), USA (East). For Moscow, detailed timings are shown: DNS, connection, SSL, TTFB.

Why does the request take up to 20 seconds?

Checking from remote regions (Europe, USA) uses the external check-host.net service with result polling. This is normal time for a multi-region check.

What timings are displayed?

For Moscow region: DNS (domain resolution), Connect (TCP connection), SSL (TLS handshake), TTFB (time to first byte), Download (body download). For remote regions — total response time.

How is this different from Ping?

Ping measures ICMP round-trip at the network level. API Latency Tester measures a full HTTP request with DNS, SSL, server processing, and data transfer — closer to the real API user experience.

Related guides

Longer-form reading on this topic from the knowledge base.

Monitoring without surprises

Multi-region, 8 alert channels, public status page, API. Scout plan — free.

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API latency creeps up

We measure from several regions and show where it is slow.

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