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GET /v1/position

Piston position

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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/crankslider-api

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Code snippets

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

Example response

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

{
    "data": {
        "note": "Displacement measured from top dead centre (θ=0). Distance-from-crank-axis is the piston-pin to crank-centre length.",
        "inputs": {
            "angle_deg": 90,
            "rod_length": 0.2,
            "crank_radius": 0.05
        },
        "stroke": 0.1,
        "rod_ratio_n": 4,
        "rod_angle_deg": 14.477512,
        "obliquity_lambda": 0.25,
        "fraction_of_stroke": 0.563508,
        "displacement_from_tdc": 0.056351,
        "distance_from_crank_axis": 0.193649
    },
    "meta": {
        "timestamp": "2026-06-04T10:18:36.176Z",
        "request_id": "50076448-d2ba-4492-83ba-43c9be36ca9f"
    },
    "status": "ok",
    "message": "Piston position",
    "success": true
}