Free Performance API - TTFB & Load Times

Parameters

name	in	type	required	description
`url`	query	string	required	Url

Request

Send your key in the X-API-Key header. More languages and patterns live on the code examples page.

curl -s "https://apixies.io/api/v1/performance?url=https%3A%2F%2Fstripe.com" \
  -H "X-API-Key: YOUR_API_KEY"

const res = await fetch("https://apixies.io/api/v1/performance?url=https%3A%2F%2Fstripe.com", {
  headers: { "X-API-Key": "YOUR_API_KEY" }
});
const data = await res.json();
console.log(data);

$ch = curl_init("https://apixies.io/api/v1/performance?url=https%3A%2F%2Fstripe.com");
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ["X-API-Key: YOUR_API_KEY"],
]);
$data = json_decode(curl_exec($ch), true);
curl_close($ch);

print_r($data);

import requests

res = requests.get(
    "https://apixies.io/api/v1/performance",
    params={"url": "https://stripe.com"},
    headers={"X-API-Key": "YOUR_API_KEY"},
)
print(res.json())

Response

The result sits under data in the standard envelope. See the response format guide for errors and status codes.

returns

data.timings: DNS, TCP, TLS, TTFB, download and total times in milliseconds.
data.timings.ttfb_ms: Time to first byte from the start of the request, DNS and connection setup included. The same thing curl calls time_starttransfer.
data.timings.server_wait_ms: The server's share of TTFB: from request sent to first byte, with no DNS, TCP or TLS time in it.
data.http_status: Final HTTP status code.
data.final_url: URL after redirects, with the hop count in redirect_count.
data.content_length: Bytes downloaded. The request asks for compression like a browser does, so this is the compressed size when the server compresses.
data.decoded_length: Size of the page after decompression, with the method (gzip, br, zstd) in content_encoding. Equal to content_length when the server doesn't compress.
data.primary_ip: IP address the connection went to.

example response 200

{
    "status": "success",
    "http_code": 200,
    "code": "SUCCESS",
    "message": "Performance analysis completed",
    "data": {
        "url": "https://github.com",
        "final_url": "https://github.com",
        "http_status": 200,
        "content_type": "text/html; charset=utf-8",
        "content_length": 117378,
        "content_encoding": "gzip",
        "decoded_length": 575801,
        "redirect_count": 0,
        "primary_ip": "140.82.121.3",
        "timings": {
            "dns_lookup_ms": 26.33,
            "tcp_connect_ms": 23.07,
            "ssl_handshake_ms": 39.48,
            "ttfb_ms": 128.03,
            "server_wait_ms": 39.08,
            "content_download_ms": 73.54,
            "total_time_ms": 201.57,
            "redirect_time_ms": 0
        },
        "analyzed_at": "2026-09-18T12:00:00+00:00"
    }
}

Authentication and limits

This endpoint needs an API key. Use the sandbox ("try it" above) to test it without registering. See the authentication guide for details.

Standard rate limits apply to this endpoint.

Common use cases

Website speed monitoring

Continuously monitor your website's performance metrics. Track DNS lookup, TTFB, and total load times over time to detect regressions before they impact users.

Competitive benchmarking

Compare your site's performance against competitors. Measure TTFB and total load times to identify areas where you can gain an edge in search rankings.

CDN and hosting evaluation

Test performance from different perspectives to evaluate CDN effectiveness, hosting providers, or DNS configuration changes. Compare before-and-after metrics for infrastructure migrations.

related endpoints

GET Link Checker Check if a URL is reachable and return its HTTP status code and response time GET Security Headers Inspector Inspect security headers for a URL to check for adherence to current best practices GET Redirect Tracer Follow a URL's redirect chain and report each hop with status code

guides

Measure TTFB with curl and Find Out Which Part Is Slow use-case The curl -w command for time to first byte, how to read its timestamps, and how to tell a slow server from a far one. Re...

getting started

authentication code examples response format

explore

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resources

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