curl "https://api.ionq.co/v0.3/characterizations/backends/qpu.harmony" \
  -H "Authorization: apiKey your-api-key"

{
  "characterizations": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "date": 123,
      "backend": "qpu.harmony",
      "qubits": 1,
      "connectivity": [
        [
          0,
          1
        ],
        [
          0,
          2
        ],
        "...",
        [
          10,
          9
        ]
      ],
      "fidelity": {
        "spam": {
          "mean": 1,
          "stderr": 1
        }
      },
      "timing": {
        "readout": 123,
        "reset": 123
      }
    }
  ],
  "pages": 123
}