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Beacon.

Know what's wrong with
your API.

Free REST API testing tool for API health checks, security scanning, performance analysis, and API score grading — like Google Lighthouse, built for APIs.

Performance audit

Analyze response time, DNS, TTFB, payload and compression.

Security checks

Inspect HTTPS, CORS, headers and common vulnerabilities.

Results in 30 seconds

No signup required. Scan any public REST API instantly.

Complete API auditing capabilities

Everything you need for REST API testing, endpoint analysis, and API best-practice monitoring in one free developer tool.

01

Performance

API performance checker for response time, TTFB, payload size, and compression.

02

Security

API security scanner for HTTPS, CORS, headers, and vulnerabilities.

03

API Score

Professional API audit grade with a detailed category breakdown.

04

Share

Share health check reports, compare APIs, and export results.

Example API health check report

api.example.com favicon

api.example.com

Excellent health
https://api.example.com/users

Scanned Jun 26, 2026 · 09:50 UTC

Overall score

0/100

Grade A

Response

243ms

Status

HTTP 200

Payload

284 B

Content-Type

application/json

Category breakdown

Performance
96
Security
82
API Quality
90
Best Practices
95
Performance
96

Fast response time (243ms).

Security
82

HTTPS enabled.

Response preview

nginx
{
  "status": "success",
  "data": {
    "id": 123,
    "name": "John Doe"
  }
}

Built for developers.

Not enterprise meetings.

Fast

Get a complete API audit in under 30 seconds. No queues, no waiting.

Beautiful

Clean, developer-friendly reports you actually want to read and share.

No Setup

Paste a URL and go. No signup, no API keys, no configuration required.

Frequently asked questions

Everything you need to know about Beacon's API health check, REST API testing, and API score.

What is Beacon?
Beacon is an API auditing platform that analyzes any public REST API for performance, security, API quality, and best practices. Paste an endpoint URL and receive a detailed health check report in under 30 seconds.
How does Beacon's API health check work?
Beacon sends a secure server-side request to your API endpoint, measures response time and payload characteristics, inspects security headers and HTTPS configuration, validates JSON responses, and scores best practices to produce an overall API score.
Is Beacon free to use?
Yes. Beacon offers free API scans with no credit card required. You get several free scans before creating a free account for unlimited REST API testing and monitoring.
What does the API score measure?
The API score combines performance, security, API quality, and best practices into a single grade from 0–100, helping developers quickly identify issues during endpoint testing and API debugging.
Can Beacon scan any REST API?
Beacon can analyze any publicly accessible HTTP or HTTPS REST API endpoint. Private networks, localhost, and authenticated URLs are blocked for security.