We have investigated a promising new group of ion pair receptors as ionophores in a three-phase electrode voltammetric ion transfer setup. The ionophores are based on a squaramide anion-binding unit and a cation-binding crown ether. We show that the ion pair receptors 5FSQC6 and CF3SQC6 both can facilitate the transfer of the very hydrophilic fluoride and sulphate ions across the water|NOP interface at significantly lower potentials than expected from their Gibbs transfer energies. We also show that the presence of a cation is crucial to the function of the receptors.