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GET /v1/summing

Summing amplifier

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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/opamp-api

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Code snippets

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

Example response

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

{
    "data": {
        "inputs": [
            {
                "voltage_v": 1,
                "contribution_v": -1,
                "resistance_ohm": 10000
            },
            {
                "voltage_v": 2,
                "contribution_v": -2,
                "resistance_ohm": 10000
            }
        ],
        "formula": "Vout = −Rf·Σ(Vi/Ri).",
        "output_voltage_v": -3,
        "feedback_resistance_ohm": 10000
    },
    "meta": {
        "timestamp": "2026-06-04T10:18:38.742Z",
        "request_id": "e4664066-32c1-4585-855f-4f1268059a08"
    },
    "status": "ok",
    "message": "Summing amplifier",
    "success": true
}