The hosts won the rain-curtailed tie by five wickets against India to keep the six-match ODI series alive at 1-3.
ICC Match Referee Andy Pycroft imposed the fine after Aiden Markram's side was ruled to be one over short of their target when time allowances were taken into consideration.
In accordance with Article 2.5.1 of the ICC Code of Conduct for Players and Players Support Personnel, which relates to minor over-rate offences, players are fined 10 per cent of their match fees for every over their side fails to bowl in the allotted time, with the captain fined double that amount.
As such, Markram has been fined 20 per cent of his match fee.
If South Africa commit another minor over-rate breach in an ODI within 12 months of this offence with Markram as captain, it will be deemed a second offence by Markram and he will face a suspension.
Markram pleaded guilty to the offence after the end of the match and accepted the proposed sanction.
So there was no need for a formal hearing.
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