An apparatus for secure multiparty computations for machine-learning is presented. The apparatus includes at least a processor and a memory communicatively connected to the at least a processor. The memory contains instructions configuring the at least a processor to submit a secure multiparty computation request onto an immutable sequential listing, wherein the secure multiparty computation request includes a contingent payment and an authenticity commitment of a first private dataset, receive at least a participant commitment from each participating device of a quorum of participating devices, generate a first localized model as a function of the first private dataset, and perform a joint training protocol as a function of the first localized model and a second localized model from the quorum of participating devices, wherein the joint training protocol includes generating a joint training datum.