Karshapana (Sanskrit: कार्षापण, IAST: Kārṣāpaṇa), according to the Ashtadhyayi of Panini, refers to ancient Indian coins current during the 6th century BCE onwards, which were unstamped and stamped (āhata) metallic pieces whose validity depended on the integrity of the person authenticating them. It is commonly supposed by scholars that they were first issued by merchants and bankers rather than the state. They contributed to the development of trade since they obviated the need for weighing of metal during exchange. Kārṣāpaṇas were basically silver pieces stamped with one to five or six rūpas ('symbols') originally only on the obverse side of the coins initially issued by the Janapadas and Mahajanapadas, and generally carried minute mark or marks to testify their legitimacy. Silver punch-marked coins ceased to be minted sometime in the second century BCE but exerted a wide influence for next five centuries.
The punch-marked coins were called "Kārṣāpaṇa" because they weighed one kārsha each.
The period of the origin of the punch-marked coins is not yet known, but their origin was indigenous. The word, Kārṣāpaṇa, first appears in the Sutra literature, in the Samvidhān Brāhmana. Coins bearing this name were in circulation during the Sutra and the Brāhmana period and also find a mention in the early Buddhist (Dhammapada verse 186) and Persian texts of that period. Patanjali in his commentary on the vārttikas of Kātyāyana on Aṣṭādhyāyī uses the word, "Kārṣāpaṇa", to mean a coin –
- कार्षापणशो ददाति
- "He gives a Kārṣāpaṇa coin to each" or
- कार्षापणम् ददाति
- "He gives a Kārṣāpaṇa",
while explaining the use of the suffix – शस् taken up by Pāṇini in Sutra V.iv.43, in this case, कार्षापण + शः to indicate a "coin". The Shatapatha Brahmana speaks about Kārṣāpaṇas weighing 100 ratis which kind were found buried at Taxila by John Marshall in 1912. The Golakpur (Patna) find pertains to the period of Ajātaśatru. The Chaman – I – Hazuri (Kabul) find includes two varieties of punch-marked Indian coins along with numerous Greek coins of 600–500 BCE, thereby indicating that those kind of Kārṣāpaṇas were contemporaneous to the Greek coins and in circulation as legal tender.
During the Mauryan Period, the punch-marked coin called Rūpyārūpa, which was same as Kārṣāpaṇa or Kahāpana or Prati or Tangka, was made of alloy of silver (11 parts), copper (4 parts) and any other metal or metals (1 part).The early indigenous Indian coins were called Suvarṇa (made of gold), Purāṇa or Dhārana (made of silver) and Kārṣāpaṇa (made of copper). The Golakpur (Patna) find is mainly pre-Maurya, possibly of the Nanda era, and appear to have been re-validated to make them kośa- praveśya (legal tender); the coins bearing larger number of marks are thought to be older in origin. The Maurya Empire was definitely based upon money-economy. The punch-marked copper coins were called paṇa. This type of coins were in circulation much before the occupation of Punjab by the Greeks  who even carried them away to their own homeland. Originally, they were issued by traders as blank silver bent-bars or pieces; the Magadha silver punch-marked Kārṣāpaṇa of Ajatashatru of Haryanka dynasty was a royal issue bearing five marks and weighing fifty-four grains, the Vedic weight called kārsha equal to sixteen māshas.
Even during the Harappan Period (ca 2300 BCE) silver was extracted from argentiferous galena. Silver Kārṣāpaṇas show lead impurity but no association with gold. The internal chronology of Kārṣāpaṇa and the marks of distinction between the coins issued by the Janapadas and the Magadhan issues is not known, the Arthashastra of Kautilya speaks about the role of the Lakshanadhyaksha ('the Superintendent of Mint') who knew about the symbols and the Rupadarshaka ('Examiner of Coins'), but has remained silent with regard to the construction, order, meaning and background of the punched symbols on these coins hence their exact identification and dating has not been possible.
Indian merchants, through land and sea routes, have traded with the east African, Arab and middle-east people from the time of King Solomon. The term Kārṣāpaṇa referred to gold, silver and copper coins weighing 80 ratis or 146.5 grains; these coins, the earliest square in shape, followed the ancient Indian system of weights described in Manu Smriti. Use of money was known to Vedic people much before 700 BCE. The words, Nishka and Krishnala, denoted money, and Kārṣāpaṇas, as standard coins, were regularly stored in the royal treasuries.
The local silver punch-marked coins, included in the Bhabhuā and Golakpur finds, were issued by the Janapadas and were in circulation during the rule of the Brihadratha dynasty which was succeeded by the Haryanka dynasty in 684 BCE; these coins show four punch-marks - the sun-mark, the six-armed symbol, arrows (three) and taurine (three) which were current even during the rule of Bimbisara (604-552 BCE). Ajatashatru (552-520 BCE) issued the first Imperial coins of six punch-marks with the addition of the bull and the lion. The successors of Ajatashatru who ruled between 520 and 440 BCE and the later Shishunaga dynasty and the Nanda dynasty issued coins of five symbols – the sun-mark, the six-armed symbol and any three of the 450 symbols. The Maurya coins also have five symbols – the sun-mark, the six-armed symbol, three-arched hill with a crescent at the top, a branch of a tree at the corner of a four-squared railing and a bull with taurine in front. Punch-marked copper coins were first issued during the rule of Chandragupta Maurya or Bindusara. The Bhīr find includes Maurya coins and a coin of Diodotus I (255-239 BCE) issued in 248 BCE.
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