Under the UFC Athlete Outfitting policy, fighters are compensated for wearing Reebok apparel in the Octagon, and during fight week. The income is based on ZUFFA-era tenure in the UFC, or tenure in top tier promotions ZUFFA has acquired like Strikeforce and WEC.
1-5 bouts gets $2,500
6-10 bouts gets $5,000
11-15 bouts gets $10,000
16-20 bouts gets $15,000
21 bouts + gets $20,000
Champions earn $40,000 while title challengers get $30,000

The full UFC 205 UFC Athlete Outfitting payouts totaled a record-breaking $392,500.

Conor McGregor: $40,000
beat Eddie Alvarez: $40,000

Tyron Woodley: $40,000
drew with Stephen Thompson: $30,000

Joanna Jedrzejczyk: $40,000
beat Karolina Kowalkiewicz: $30,000

Yoel Romero: $5,000
beat Chris Weidman: $10,000

Raquel Pennington: $5,000
beat Miesha Tate: $10,000

Frankie Edgar: $20,000
beat Jeremy Stephens: $20,000

Khabib Nurmagomedov: $5,000
beat Michael Johnson: $15,000

Vicente Luque: $2,500
beat Belal Muhammad: $2,500

Jim Miller: $20,000
beat Thiago Alves: $20,000

Tim Boetsch: $15,000
beat Rafael Natal: $15,000

Liz Carmouche: $5,000
beat Katlyn Chookagian: $2,500

Reebok pay serves as a rough measure of the quality of a show. A full card with all green fighters would total $90,000. A card with a mathematically impossible 13 title fights would be $910,000. By this standard, UFC 205 was the greatest card in league history.

UFC 205:$392,500
UFC 204: $202,500
UFC 202: $207,500
UFC 201: $205,000
UFC 200: $350,000
UFC 199: $297,500
UFC 198: $240,000
UFC 197: $222,500
UFC 196: $220,000
UFC 195: $172,500

H/T MMAjunkie