curl --request POST \
  --url https://api.iotools.cloud/v1/tool/gamma-function-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "x": "5"
}'

{
  "tool": "gamma-function-calculator",
  "tool_version": "1.0.2",
  "outputs": {
    "result": [
      {
        "function": "Γ(5)",
        "value": "24"
      },
      {
        "function": "ln|Γ(5)|",
        "value": "3.178054"
      }
    ]
  },
  "credits_used": 5,
  "credits_remaining": null
}