Good Morning,

I am using RDP to retrieve GBP Libor 6M curve, and I have noticed that there is a difference with the data that I get from the Eikon Desktop Application using the RIC for Zero Coupon Curves 0#GBPSBSLZ=R. I would appreciate if you could explain me the reasons for the difference that I am going to show now.

In RDP, I am using the endpoint: https://api.refinitiv.com/data/quantitative-analytics-curves-and-surfaces/v1/curves/zc-curves, with the following body:

{  "universe": [    {      "curveParameters": {        "valuationDate": "2021-12-31",        "priceSide": "Mid",        "interpolationMode": "CubicDiscount"      },      "curveDefinition": {        "currency": "GBP",        "indexName": "LIBOR",        "name": "GBP LIBOR Swap ZC Curve",        "source": "Refinitiv",        "discountingTenor": "OIS"      }    }  ],  "outputs": [    "Constituents",    "DetailedCurvePoint",    "UnderlyingCurves"  ]}

I am going to focus in the differences for the 20Y point. The 20Y point obtained from the API is:

{             "endDate": "2041-12-31",              "startDate": "2021-12-31",              "discountFactor": 0.7923508883940772,              "ratePercent": 1.1705526921350629,              "tenor": "20Y",              "instruments": [                {                  "instrumentCode": "GBPSB6L20Y=TWEB",                  "value": 1.1705                }              ]            },

So, I understand that the 20Y zero coupon rate is 1.170552..., and it is obtained bootstrapping the TWEB swap curve (#0GBPSB6LIRS=TWEB).

In the Desktop Application, I usually use the RIC 0#GBPSBSLZ=R, whose description is "UK Pound Sterling SB 6M Libor Zero Coupon Yield Curve", to get the previous information. Here the data for 31-12-2021:

As you can see, the 20Y point of the green line is 1.343, which is far from the 1.170 obtained through the API.

Thanks in advance.