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Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Send message/send with a data part {\"type\": \"<skill id>\", \"value\": \"...\"}; the agent answers with an x402 payment-required task,…","description":"Format and checksum validation for IBAN, EU VAT, Polish NIP/REGON/PESEL and email, pay-per-call via x402. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base. Send message/send with a data part {\"type\": \"<skill id>\", \"value\": \"...\"}; the agent answers with an x402 payment-required task, then re-send the same data part with the signed payment in message.metadata (stateless: nothing is stored).","publisher":{"name":"Crew of the Captain","url":"https://crewofthecaptain.com"},"homepage":"https://validate.crewofthecaptain.com/llms.txt","repository":null,"version":"1.3.0","license":null,"protocols":["a2a"],"tags":["validation","format","checksum","x402","iban","eu-vat","pl-nip","pl-regon","pl-pesel","email"],"pricing":null,"endpoints":[{"url":"https://validate.crewofthecaptain.com/a2a","type":"a2a","auth":"none","probeable":true}],"skills":[{"id":"iban","name":"Validate iban","tags":["validation","format","checksum","x402","iban"],"description":"IBAN: country length + ISO 13616 mod-97 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base."},{"id":"eu-vat","name":"Validate eu-vat","tags":["validation","format","checksum","x402","eu-vat"],"description":"EU VAT number: per-country format (offline, no VIES); PL also NIP checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base."},{"id":"pl-nip","name":"Validate pl-nip","tags":["validation","format","checksum","x402","pl-nip"],"description":"Polish NIP tax id: 10 digits + weighted mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base."},{"id":"pl-regon","name":"Validate pl-regon","tags":["validation","format","checksum","x402","pl-regon"],"description":"Polish REGON: 9 or 14 digits + mod-11 checksum. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base."},{"id":"pl-pesel","name":"Validate pl-pesel","tags":["validation","format","checksum","x402","pl-pesel"],"description":"Polish PESEL: checksum + encoded birth date and sex. Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base."},{"id":"email","name":"Validate email","tags":["validation","format","checksum","x402","email"],"description":"Email address syntax (dot-atom local part, LDH domain; no DNS). Only $0.001 (0.1 cent) per check, paid via x402 in USDC on Base."}],"tools":["Validate iban","Validate eu-vat","Validate pl-nip","Validate pl-regon","Validate pl-pesel","Validate email"],"extra":{"inputModes":["application/json"],"outputModes":["application/json"],"capabilities":{"streaming":false,"pushNotifications":false,"stateTransitionHistory":false},"protocolVersion":"0.3.0"},"attribution":{"kind":"a2a_card","name":"a2a_card","summary":"a2a_card","version":"a2a_card","description":"a2a_card","homepageUrl":"a2a_card","publisherUrl":"a2a_card","publisherName":"a2a_card"}},"derived":{"capabilities":[{"slug":"productivity.email","name":"Email","confidence":1,"provenance":"declared"}],"categories":["productivity"],"language":"en"},"observed":{"status":"live","statusReason":"Responded 3h 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