Figures provided by the California senator's campaign indicate that over half of the contributions came from people who had never given to her before.
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In total, she received donations from over 63,000 people in the hours after her Thursday night appearance on the debate stage in Miami. Her campaign says the average contribution was about $30.
The debates were hosted by NBC and spread across two days. The network says Thursday's event was the party's most-watched ever.
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Harris' appearance that night was widely acclaimed. She had a headline-making exchange with former Vice President Joe Biden over his civil rights record.
Who is Kamala Harris? What to know about the 2020 candidate