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Nadthawan Panthong (, born November 16, 1997), known professionally as Stamp Fairtex (), is a Muay Thai kickboxer and mixed martial artist from Thailand. She is currently signed to ONE Championship, where she is the former ONE Women's Atomweight MMA World Champion. She is the organization's first three-sport world champion, having also held the ONE Atomweight Muay Thai World Championship and ONE Atomweight Kickboxing World Championship.
Initially competing in the all-striking ONE Super Series, Stamp made her mixed martial arts (MMA) debut on October 11, 2018. She won the 2021 ONE Women's MMA Atomweight World Grand Prix.
Her ring name is inspired by the Fairtex Gym in Pattaya where she trained from age 18.
At 18, she moved to the Fairtex Gym in Pattaya, where she would also begin training in Brazilian jiu-jitsu. Stamp has won a gold medal at the 2019 Siam Cup BJJ tournament in the women's gi 58.5 kg class.
She was next scheduled to face Janet Todd for the inaugural ONE Atomweight Muay Thai World Championship at on February 22, 2019. Stamp won the fight by unanimous decision to claim the ONE Atomweight Muay Thai World Championship and become ONE Championship's first two-sport world champion.
Stamp Fairtex would defend her ONE Atomweight Muay Thai World Championship against Alma Juniku at on June 15, 2019. She retained her title by a unanimous decision victory.
After three straight mixed martial arts matches, Stamp would face Janet Todd for the second time to defend the ONE Atomweight Kickboxing World Championship at on February 28, 2020. Stamp lost the title to Todd via a closely contested split decision, marking her first-ever loss in ONE Championship.
Stamp Fairtex was then scheduled to defend her Atomweight Muay Thai belt for the second time during on August 28, 2020, with her opponent being the Queens of the Ring Flyweight Tournament winner Allycia Rodrigues. After five rounds, Stamp lost the title to Rodrigues by majority decision.
On January 11, 2023, it was announced that Stamp would face Anissa Meksen for the interim ONE Women's Atomweight Kickboxing World Championship. The fight was cancelled after Meksen voiced her displeasure with how she was treated by the promotion.
Stamp Fairtex will face Kana Morimoto at ONE 173 on November 16, 2025.
In 2019, Stamp announced her intentions to continue to compete in mixed martial arts in ONE Championship, with the goal of becoming a ONE World Champion in MMA as well. She made her ONE Championship promotional MMA debut against Asha Roka at on August 16, 2019. Stamp won by submission at 1:29 of the third round via rear naked choke. Following the submission victory, she was given her blue belt in Brazilian jiu-jitsu by De'Alonzio Jackson.
Stamp was next expected to face Bi Nguyen at on November 8, 2019. After dominating all three rounds with her Muay Thai-based striking, she won by unanimous decision.
Stamp next faced Puja Tomar at on January 10, 2020. Stamp defeated Tomar by TKO at 4:27 of the first round via ground and pound.
Leading up to her fight with Tomar, Stamp voiced interest in facing Mei Yamaguchi, who she said possessed high-class wrestling skills, to test her own level. She said she hoped a fight with Yamaguchi would help solidify her all-round MMA skills before she potentially challenging for a ONE World Title. "My stand-up game is really good. It is strong, but my ground game still needs a lot of work," Stamp said, "I need to improve my ground game and get stronger because (reigning ONE Women’s Atomweight World Champion) Angela Lee is good all-around."
Stamp next faced Sunisa Srisen at on July 31, 2020. She extended her winning streak to five with a first-round TKO of Srisen.
She then faced Alyona Rassohyna at on January 22, 2021. Despite dominating the majority of the fight, Stamp lost by submission via a last-effort guillotine choke in the closing seconds, earning her first loss in MMA competition. While there was initially some controversy surrounding the fight, with Stamp arguing she did not tap, media outlets generally agreed that she did tap out.
Stamp was scheduled to face Seo Hee Ham in the semi-final bout of ONE Women's Atomweight Grand Prix at on October 29, 2021. Ham later withdrew from the bout after suffering an injury in training, and was replaced by Julie Mezabarba. Stamp won the fight by unanimous decision.
Stamp faced Ritu Phogat in the ONE Women's Atomweight Grand Prix Final at on December 3, 2021. She defeated Phogat by submission via armbar in the second round to win the 2021 ONE Women's Atomweight World Grand Prix Championship.
Stamp faced Jihin Radzuan at ONE on Prime Video 2 on October 1, 2022. At the weigh-ins, Radzuan weighed in at 120.25 pounds, 5.25 lbs over the atomweight non-title fight limit. Radzuan was fined 30% of their purse, which went to their opponent Stamp. Stamp won the fight by unanimous decision.
Before Stamp faced Radzuan, it was announced that Anissa Meksen will fight Stamp in a Mixed Rules-bout at ONE on Prime Video 6 on January 14, 2023, at the Impact, Muang Thong Thani in Bangkok. After she won, Fairtex responded to being called a 'dancer' by Meksen, stating that Meksen has never won a ONE Championship-belt, as Fairtex actually held both the ONE Atomweight Muay Thai and Kickboxing title simultaneously. The fight was cancelled on the day of weigh-ins, as Meksen failed to appear. Stamp was rescheduled to face Anna Jaroonsak in a strawweight kickboxing bout at the same event. Stamp won the fight by split decision and was awarded a $50,000 bonus afterwards.
Stamp faced Alyse Anderson on May 5, 2023, at ONE Fight Night 10. Stamp won the fight by knockout via body kick in the second round. She was awarded a $50,000 bonus afterwards.
In her first title defence, Stamp was scheduled to face former teammate Denice Zamboanga on March 1, 2024, at ONE 166. However, the bout was moved to June so the fighters can take part in the start of an original docuseries production. The bout was rescheduled on June 8, 2024, at ONE 167. However, on May 21, it was announced that Fairtex pulled out of the bout due to injury.
Stamp was scheduled face Xiong Jing Nan for the ONE Women's Strawweight World Championship on September 6, 2024, at ONE 168. However, due to injury she was forced to withdraw.
Following the rehab of her knee, Stamp was scheduled to face interim champion Denice Zamboanga at ONE 173 on August 1, 2025. However, it was announced in May 2025 that Stamp withdrew due to a setback in her recovery from knee surgery. As a result, Stamp agreed to relinquish her atomweight MMA title and Zamboanga was subsequently be promoted to undisputed champion.
|- style="background:#cfc;" | 2023-01-14 || Win ||align=left| Supergirl Jaroonsak || ONE on Prime Video 6 || Bangkok, Thailand || Decision (Split) || 3 || 3:00 |- |- style="background:#FFBBBB;" | 2020-08-28 || Loss ||align=left| Allycia Rodrigues || || Bangkok, Thailand || Decision (Majority) || 5 || 3:00 |- ! style=background:white colspan=9 | |- style="background:#FFBBBB;" | 2020-02-28 || Loss ||align=left| Janet Todd || || Kallang, Singapore || Decision (Split) || 5 || 3:00 |- ! style=background:white colspan=9 | |- style="background:#cfc;" | 2019-06-15|| Win ||align=left| Alma Juniku || || Shanghai, China || Decision (Unanimous) || 5 ||3:00 |- ! style=background:white colspan=9 | |- style="background:#CCFFCC;" | 2019-02-22|| Win ||align=left| Janet Todd || || Kallang, Singapore || Decision (Unanimous)|| 5 || 3:00 |- ! style=background:white colspan=9 | |- style="background:#CCFFCC;" | 2018-10-06|| Win ||align=left| Kai Ting Chuang || || Bangkok, Thailand || Decision (Unanimous)|| 5 || 3:00 |- ! style=background:white colspan=9 | |- style="text-align:center; background:#cfc;" | 2017-03-28 || Win||align=left| Sylvie Petchrungruang || Thepprasit Stadium || Pattaya, Thailand || Decision || 5 || 3:00 |- ! style=background:white colspan=9 | |- style="background:#CCFFCC;" | 2016-08-13|| Win ||align=left| Saokhonkaen Sor Sompol || PPTV Muay Thai Fight Night || Bangkok, Thailand || Decision || 3 || 3:00 |- |- | colspan=9 | Legend:
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