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GET /v1/rate-constant

k = A·exp(−Ea/RT) solver

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/arrhenius-api

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Code snippets

curl "https://api.oanor.com/arrhenius-api/v1/rate-constant" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/arrhenius-api/v1/rate-constant", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/arrhenius-api/v1/rate-constant");
curl_setopt($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/arrhenius-api/v1/rate-constant",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

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

{
    "data": {
        "formula": "k = A·exp(−Ea/RT).",
        "solved_for": "rate_constant",
        "rate_constant": 0.71442175,
        "temperature_K": 298,
        "pre_exponential": 10000000000000,
        "activation_energy": {
            "J_per_mol": 75000,
            "kJ_per_mol": 75
        }
    },
    "meta": {
        "timestamp": "2026-06-04T10:18:56.843Z",
        "request_id": "bab002f1-5e17-4e90-8785-cef28ee20249"
    },
    "status": "ok",
    "message": "k = A·exp(-Ea/RT) solver",
    "success": true
}