A method for sequencing a nucleic acid is provided. In certain embodiments, the method includes contacting a nucleic acid duplex comprising a nucleic acid template and a primer annealed to the template with a reagent mix under primer extension conditions to produce an extended primer and ATP. The reagent mix may contain an adenosine-2'-deoxynucleoside tetraphosphate moiety and a polymerase. The method further includes detecting the produced ATP. Also provided are adenosine-2'-deoxynucleoside tetraphosphate moieties that find use in the subject methods. Also provided are kits containing the adenosine-2'-deoxynucleoside tetraphosphate moieties for use in the subject methods.