Looking on the internet deeply has found these results:

in a daily bases is the most popular phrase on the web.

on a daily bases 1487,000 results on the web	in a daily bases 114,200,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
20, Bachyla Uladzimir, 30 daily base units (1050000 BLR); 20, Kudlayew Alyaksandr, 30 daily base units; Unlike you betty Whoever rediculous getup some of daily bases. I have a reputation to protect. 28, Kudlaew Alyaksandr, 50 daily base units (1750000 BLR). 23, Kazak Zmitser, 28 daily base units (980000 BLR); 23, Shewtsow Syarhey, 8 daily base units (280000 BLR); 04, Plyuto Tatsyana, 20 daily base units (700000 BLR); 30, Tsyareshchanka Uladzimir, 25 daily base units (875000 BLR);	23, Kazak Zmitser, 28 daily base units (980000 BLR); 30, Tsyareshchanka Uladzimir, 25 daily base units (875000 BLR); 23, Shewtsow Syarhey, 8 daily base units (280000 BLR); 20, Kudlayew Alyaksandr, 30 daily base units; 20, Bachyla Uladzimir, 30 daily base units (1050000 BLR); Unlike you betty Whoever rediculous getup some of daily bases. I have a reputation to protect. 28, Kudlaew Alyaksandr, 50 daily base units (1750000 BLR). 04, Plyuto Tatsyana, 20 daily base units (700000 BLR);

on a daily bases

1487,000 results on the web

in a daily bases

114,200,000 results on the web

More popular!

20, Bachyla Uladzimir, 30 daily base units (1050000 BLR);
20, Kudlayew Alyaksandr, 30 daily base units;
Unlike you betty Whoever rediculous getup some of daily bases. I have a reputation to protect.
28, Kudlaew Alyaksandr, 50 daily base units (1750000 BLR).
23, Kazak Zmitser, 28 daily base units (980000 BLR);
23, Shewtsow Syarhey, 8 daily base units (280000 BLR);
04, Plyuto Tatsyana, 20 daily base units (700000 BLR);
30, Tsyareshchanka Uladzimir, 25 daily base units (875000 BLR);

23, Kazak Zmitser, 28 daily base units (980000 BLR);
30, Tsyareshchanka Uladzimir, 25 daily base units (875000 BLR);
23, Shewtsow Syarhey, 8 daily base units (280000 BLR);
20, Kudlayew Alyaksandr, 30 daily base units;
20, Bachyla Uladzimir, 30 daily base units (1050000 BLR);
Unlike you betty Whoever rediculous getup some of daily bases. I have a reputation to protect.
28, Kudlaew Alyaksandr, 50 daily base units (1750000 BLR).
04, Plyuto Tatsyana, 20 daily base units (700000 BLR);