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GET /v1/encode

Resistance to colour bands

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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/resistor-api

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Code snippets

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

Example response

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

{
    "data": {
        "ohms": 4700,
        "bands": [
            "yellow",
            "violet",
            "red",
            "gold"
        ],
        "exact": true,
        "formatted": "4.7 kΩ",
        "encoded_ohms": 4700,
        "requested_bands": 4,
        "tolerance_percent": 5
    },
    "meta": {
        "timestamp": "2026-06-03T17:42:16.460Z",
        "request_id": "3fe14a0c-f97a-4b09-a838-655fd166565a"
    },
    "status": "ok",
    "message": "Encode value",
    "success": true
}