Unprecedented loss of biodiversity and zoonotic disease outbreaks threaten human and planetary well-being. The consumption of wild meat lies as the intersection of these interrelated risks, yet supply-side interventions in informal markets remain understudied. We provide evidence that voluntary payment contracts to wild meat vendors in the spirit of payments for ecosystem services (PES) can reduce wild meat reliance. Our study combines a baseline survey with 433 informal restaurant owners in Abidjan, Côte d’Ivoire that informed randomized field experiments involving 56 of those restaurants, with an online survey of 2,131 Europeans across 24 countries who may help fund the contracts via donation calls. All participating restaurant owners received financial training and were randomly assigned to a control group (display information poster) or a treatment group (poster plus monetary compensation for a four-week ban of wild meat sales). In addition to the 4-weeks intervention phase, we collect data for 2 weeks pre- and post-intervention, and extensive baseline and endline questionnaires to comprehensively evaluate the effectiveness of the intervention. Treatment restaurants achieved 98% compliance (verified by mystery shoppers) and reduced wild meat sales to 0.3 dishes per day, collectively avoiding 1.9 tons of wild meat sales. Notably, the financial performance of restaurants was stable, even without the compensation payments, by substituting wild meat for other dishes. Importantly, we observe no evidence of spillovers onto control restaurants, and 50% of the treatment effect was sustained two weeks after payments ended. The survey of European donors shows substantial willingness to financially support our program, with 71% of participants sacrificing on average 50% of their resources in donations. Together, these results show that voluntary PES-style incentives may offer a scalable and financially sustainable mechanism to reduce pressure on wildlife and lower zoonotic disease risks from informal urban markets, ultimately improving upon planetary health.