The reasons why the Western Mediterranean, especially Carthage and Rome, resisted monetization relative to the Eastern Mediterranean are still unclear. Here, we address this question by combining lead and silver isotope abundances in silver coinage from the Aegean, Magna Graecia, Carthage, and the Roman Republic. The clear relationships observed between 109 Ag/ 107 Ag and 208 Pb/ 206 Pb reflect mixing of silver ores or silver objects with lead metal used for cupellation. The combined analysis of Ag and Pb isotopes reveal important information about the technology of smelting. The Greek world extracted Ag and Pb from associated ores, whereas, on the Iberian Peninsula, Carthaginians and Republican era Romans applied Phoenician cupellation techniques and added exotic Pb to lead-poor Ag ores. Massive silver re-cupellation is observed in Rome during the Second Punic War. After defeating the Carthaginians and the Macedonians in the late 2 nd century BCE, the Romans brought together the efficient, millenniumold techniques of silver extraction of the Phoenicians, who considered this metal a simple commodity, with the monetization of economy introduced by the Greeks.Silver has been highly prized in the Mediterranean and Near East region for millennia. The most obvious traces of its extraction can be seen in the contamination of ice and peat bogs all the way to the Arctic (Cortizas et al., 2002;Hong et al., 1994). The rise of monetized silver in the late 6 th and the 5 th century BCE in the Eastern Mediterranean world can be interpreted in different ways. Some consider that minting facilitated trade (Davis, 2012;Kim and Kroll, 2008), and, indeed, the abundance of shipwrecks in the Mediterranean as a proxy for economic performance correlates with lead peaks observed in Arctic ice (Parker, 1992). In the long run, however, the spread of coinage is also undoubtedly linked to the explosion of Greek mercenary service in the late 6 th -5 th centuries, but to an extent that varies with the period and the local political circumstances (De Callataÿ, 2019;Krasilnikoff, 1992; Trundle, 2004). The present work uses Ag and Pb isotopes to further inform the debate by investigating the transition between two modes of silver utilization