System Operational

Output integers
with precision.

The most robust REST API for natural whole numbers. Strict typing, content negotiation, and zero-dependency validation.

Get Started
bash — curl
$ curl -H "Accept: application/json" \
  https://numbers.frag-ferdi.de/number/556
{ "value": 556 }
$
🛡️

Strict Validation

Reject floats, strings, and negatives automatically. Only pure natural numbers pass through.

🤝

Content Negotiation

Intelligent response formatting. Request JSON or Plaintext via headers or User-Agent detection.

⚡

Zero Latency

Built on lightweight PHP 8.2 without heavy frameworks. Responses in microseconds.