I would like to retrieve the historical asset swap spread from Markit iBoxx, using Python API with the ek.get_data() function.
Example: considering the ISIN DE0006601099 (EUR Corp AA for duration 5-7 years), I would like to now what to put as 'fields', so that
iboxx_idx, err = ek.get_data('DE0006601099', fields, parameters={'SDATE':'2023-05-01'})
would output the asset swap margin for the iBoxx index on the relevant date.
Any idea how to proceed ?
Thanks a lot in advance.