curl --request POST \
  --url https://api.fincept.in/quantlib/volatility/sabr/density \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "forward": 100,
  "expiry": 1,
  "alpha": 0.25,
  "beta": 0.5,
  "rho": -0.2,
  "nu": 0.3,
  "strikes": [
    85,
    90,
    95,
    100,
    105,
    110,
    115
  ]
}
'

{
  "success": true,
  "data": {
    "forward": 100,
    "expiry": 1,
    "density": [
      {
        "strike": 85,
        "density": 0.0052
      },
      {
        "strike": 90,
        "density": 0.0118
      },
      {
        "strike": 95,
        "density": 0.0215
      },
      {
        "strike": 100,
        "density": 0.0285
      },
      {
        "strike": 105,
        "density": 0.0241
      },
      {
        "strike": 110,
        "density": 0.0152
      },
      {
        "strike": 115,
        "density": 0.0078
      }
    ]
  }
}