The DES DR2 single-epoch images have their own SIA service called 'des_dr2_se'. For example, to query the service you might do something like:
from astropy import units as u
from astropy.coordinates import Angle
from pyvo.dal import sia
DEF_ACCESS_URL = "https://datalab.noirlab.edu/sia/des_dr2_se" # DES DR2 Single-epoch SIA service URL
svc = sia.SIAService(DEF_ACCESS_URL)
ra, dec = 73.4708333, -50.3763611
# 4amin search, g-band images
imgTable = svc.search((ra,dec), (Angle(4 * u.arcmin), Angle(4 * u.arcmin)),verbosity=0).to_table()
onlyImage = imgTable[(imgTable['prodtype']=='image') & \
((imgTable['obs_bandpass'] == 'g DECam SDSS c0001 4720.0 1520.0'))].to_pandas()
print(onlyImage['access_url'][1])
I dont believe we have the PSFEx models, certainly not for the SE images.
The DES DR2 coadds can be accessed using the SIA service at: https://datalab.noirlab.edu/sia/des_dr2
Both the DR2 coadds and SE image files are also available from our file service which can be accessed using the command-line client or the Python API. For example,
from dl import storeClient as sc
print(sc.ls('des_dr2://dr2_se'))
will list the contents of the DR2 SE directory. See the HowTo notebook on using the file service in the 'notebooks-latest' folder on the Jupyter notebook server.
Hope this helps, please let us know if you still have questions.