{"machine":"percentage-calc","slot":"S47","title":"Percentage calculator","how_to_call":"POST https://innernetcorp.com/machines/percentage-calc with Content-Type: application/json","price_usd":"$0.003","currencies":["USDC","EURC"],"payment":"x402: send the POST without payment to receive a 402 with signed requirements; pay any option and retry.","input_example":{"operation":"percent_of","x":15,"y":200},"input_schema":{"type":"object"},"summary":"All percentage math in one machine: X% of Y, what percent X is of Y, and percentage change between two values.","catalog":"/catalog"}