The exact breakdown is here. http://developer.yahoo.com/search/boss/fees.html http://developer.yahoo.com/search/boss/fees.html There are two examples: * Deve

The exact breakdown is here. http://developer.yahoo.com/search/boss/fees.html http://developer.yahoo.com/search/boss/fees.html There are two examples: * Developer A submits 7000 API requests in a given day. Each API call requests search results 1-10. Since 1000 requests of this type cost 3 units (for a total of 21 units) and each developer gets 30 units per day for free, Developer A is not charged anything. * Developer B also submits 7000 API requests. Each API call requests results 1-100. Since 1000 requests of this type cost 10 units (for a total of 70 units) and each developer gets 30 units per day for free, Developer B will be charged for 40 units (70 - 30 = 40). The price of 40 units is $4.00 (40 x $0.10 = $4.00). It's also worth noting that pricing is in units of 1000 requests however we will charge per request, it's just not worth quoting prices for units smaller than 1000. Disclaimer: I work for Y!