The number of free trial credits differs per service; the amount may range from 5 or 10 credits up to 250 credits. Additionally, please note that a single API request may deduct multiple hits depending on the request, and the data set returned. For instance, quote requests with multiple symbols will count as one hit per symbol.
A summary of your trial account hit credits and usage is available under your account. Details about how hits are calculated for each API are available under the product's 'API List and Documentation' page.