You can set any daily budget, that seems reasonable to you. The only limitation is technical: budgets less than 121 satoshis won’t be spent, but note that the amount would have an impact on the connected ad units, expected clicks, and impressions.

We recommend setting a daily budget higher than 0.00001 BTC because our algorithms' rounding errors and probabilistic nature might not be spent or could be spent without a result.

Just mind checking the traffic estimations when you set a daily budget at Campaign -> Payment model page. Please note that traffic estimations might not be accurate, especially if you have a narrow targeting and low budgets.

The larger the budget, the longer the campaign and the wider the targeting - the more predictable results.
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