As it doesn't seem to be a thing I pushed ahead with developing my own
I have a Amadeus developer API so I'm working from this API 
Connect to Amadeus travel APIs | Amadeus for Developers and specifically /shopping/hotel-offers
I've got the 8 digit IDs for the hotel I'm looking for. I can ping it and process the result to my little database.
The prices don't look that exciting but for the purpose it can indicate a price level change if they have released new inventory which I can then search in other engines and actually book.
work in progress.
The API give 2,000 calls for free per month. 
If anyone is interested a response looks like this :
{
  "data": [
    {
      "type": "hotel-offers",
      "hotel": {
        "type": "hotel",
        "hotelId": "HRLAS734",
        "chainCode": "HR",
        "dupeId": "700007405",
        "name": "FLAMINGO LAS VEGAS",
        "cityCode": "LAS",
        "latitude": 36.11594,
        "longitude": -115.16986
      },
      "available": true,
      "offers": [
        {
          "id": "xx_xx_xx",
          "checkInDate": "2024-10-22",
          "checkOutDate": "2024-10-27",
          "rateCode": "AAA",
          "rateFamilyEstimated": {
            "code": "AAA",
            "type": "C"
          },
          "category": "PRO",
          "commission": {
            "percentage": "10.0"
          },
          "room": {
            "type": "C1K",
            "typeEstimated": {
              "category": "DELUXE_ROOM",
              "beds": 1,
              "bedType": "KING"
            },
            "description": {
              "text": "AAA -CAA MEMBER RATE \nGo Deluxe 1 King or 2 Queens pillowtop mattress Premium Sound \nsystem with IPod station TV built into the vanity mirror in \nbathroom Glass walled shower with body jets in bathroom ",
              "lang": "EN"
            }
          },
          "guests": {
            "adults": 1
          },
          "price": {
            "currency": "USD",
            "total": "5146.95",
            "variations": {
              "average": {
                "base": "899.10"
              },
              "changes": [
                {
                  "startDate": "2024-10-22",
                  "endDate": "2024-10-27",
                  "base": "899.10"
                }
              ]
            }
          },
          "policies": {
            "cancellations": [
              {
                "numberOfNights": 1,
                "deadline": "2024-10-19T00:00:00-07:00"
              }
            ],
            "deposit": {
              "deadline": "2024-01-31T00:00:00",
              "acceptedPayments": {
                "creditCards": [
                  "AX",
                  "DC",
                  "DS",
                  "JC",
                  "CA",
                  "VI"
                ],
                "methods": [
                  "CREDIT_CARD"
                ]
              }
            },
            "paymentType": "deposit"
          },
          "self": ""
        }
      ],
      "self": ""
    }
  ]
}