GSM ↔ US basis weight

Code snippets

curl "https://api.oanor.com/paper-api/v1/convert" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/paper-api/v1/convert", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/paper-api/v1/convert");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/paper-api/v1/convert",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "gsm": 80,
        "note": "Basis weight is for bond stock (basis size 17×22 in, 500 sheets). gsm = lb × 3.7595.",
        "input": {
            "stock": "bond",
            "basis_size_in": "17×22"
        },
        "basis_weight_lb": 21.28,
        "factor_gsm_per_lb": 3.7595
    },
    "meta": {
        "timestamp": "2026-06-04T01:59:13.573Z",
        "request_id": "0353c058-c609-4bc0-83f6-c5a7076f8a47"
    },
    "status": "ok",
    "message": "GSM <-> basis weight",
    "success": true
}