Is there a method in the nba-api package which allows querying the endpoint for data regarding transactions between teams (https://www.nba.com/stats/transactions/)?
I didn't look, but no need for that package. Just get that data directly:
import pandas as pd
import requests
url = 'https://www.nba.com/stats/js/data/playermovement/NBA_Player_Movement.json'
jsonData = requests.get(url).json()
df = pd.DataFrame(jsonData['NBA_Player_Movement']['rows'])
Output:
print(df)
Transaction_Type TRANSACTION_DATE ... Additional_Sort GroupSort
0 Signing 2021-04-21T00:00:00 ... 0.0 Signing 1039411
1 Signing 2021-04-21T00:00:00 ... 0.0 Signing 1039412
2 Signing 2021-04-21T00:00:00 ... 0.0 Signing 1039413
3 Signing 2021-04-21T00:00:00 ... 0.0 Signing 1039414
4 Signing 2021-04-20T00:00:00 ... 0.0 Signing 1039383
... ... ... ... ...
4581 Signing 2015-07-02T00:00:00 ... 0.0 Signing 944820
4582 Signing 2015-07-02T00:00:00 ... 0.0 Signing 944876
4583 Signing 2015-07-02T00:00:00 ... 0.0 Signing 944877
4584 Signing 2015-07-02T00:00:00 ... 0.0 Signing 944878
4585 Signing 2015-07-01T00:00:00 ... 0.0 Signing 944801
[4586 rows x 9 columns]