With Chainstack, every API call to your Polygon node is always billed as 1 request irrespective of the type of request or the computation resources.
1 eth_blockNumber = 1 request
1 eth_getBlockReceipts = also 1 request
1 trace_replayTransaction = still just 1 request!
No method-specific fees. No rocket-science-ing your budget. No second-guessing your spending. Just simple and predictable billing every month.