The contractual formula is becoming increasingly attractive to stakeholders, especially when it is associated with a booming market, as is the case for carbon sequestration in agricultural soils. Contracts have developed in tandem with the interest of this natural sequestration by agricultural soils to achieve climate neutrality by 2050. The parallel arrival of draft legislation with binding targets does not oppose two modes of legal intervention. On the contrary, it actually tends to strengthen the legitimacy of each of them in favour of increased protection of agricultural soils, although many questions remain unanswered.