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GET /v1/mass-ratio

Mass ratio

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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/rocket-api

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Code snippets

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

Example response

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

{
    "data": {
        "note": "Required mass ratio m0/mf = exp(Δv/ve). The propellant mass fraction 1 − mf/m0 grows steeply with Δv — the tyranny of the rocket equation.",
        "inputs": {
            "delta_v": 2695.7,
            "exhaust_velocity_ms": 2941.995
        },
        "dry_mass": 400,
        "wet_mass": 999.992267,
        "mass_ratio": 2.499981,
        "propellant_mass": 599.992267,
        "propellant_mass_fraction": 0.599997
    },
    "meta": {
        "timestamp": "2026-06-05T11:30:29.098Z",
        "request_id": "b8404a1b-0620-4ea2-89a8-dad0862070bd"
    },
    "status": "ok",
    "message": "Mass ratio",
    "success": true
}