{"machine":"validate-isbn","slot":"S65","title":"ISBN validator","how_to_call":"POST https://innernetcorp.com/machines/validate-isbn with Content-Type: application/json","price_usd":"$0.001","currencies":["USDC","EURC"],"payment":"x402: send the POST without payment to receive a 402 with signed requirements; pay any option and retry.","input_example":{"isbn":"978-3-16-148410-0"},"input_schema":{"type":"object"},"summary":"Validate ISBN-10 and ISBN-13 book numbers with their checksums.","catalog":"/catalog"}