# Services from api.aventtech.com on Zero > api.aventtech.com serves 21 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero. Canonical page: https://www.zero.xyz/host/api.aventtech.com Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.aventtech.com/health.json ## Services - [EU VAT Number Validation (VIES)](https://www.zero.xyz/c/eu-vat-number-validation-vies-17b1d0d9/llms.txt): $0.005/call via x402. Validates EU VAT numbers in real-time against the European Commission VIES registry, returning validity status and available trader name and address. - [Phone Number Validation & Normalization (libphonenumber)](https://www.zero.xyz/c/phone-number-validation-normalization-libphonenumber-21389954/llms.txt): $0.003/call via x402. Validates and normalizes international phone numbers using libphonenumber, returning validity, country, E.164 format, national/international formats, and line type. - [DNS Lookup via DNS-over-HTTPS (api.aventtech.com)](https://www.zero.xyz/c/dns-lookup-via-dns-over-https-api-aventtech-com-382157e4/llms.txt): $0.002/call via x402. Resolves DNS records (A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, SRV, PTR) for a given hostname using DNS-over-HTTPS, returning records and TTLs. - [Cron Expression Explainer & Next Run Times](https://www.zero.xyz/c/cron-expression-explainer-next-run-times-653d366a/llms.txt): $0.003/call via x402. Converts a 5-field cron expression into a human-readable description and returns the next N upcoming run times in UTC. - [Password Strength & Breach Inspector](https://www.zero.xyz/c/password-strength-breach-inspector-cc72d1a8/llms.txt): $0.004/call via x402. Analyzes a password for character classes, entropy bits, strength verdict, and checks it against Have I Been Pwned breach data using k-anonymity (only a hash prefix is sent, never the raw password). - [AV/IT Device Integration Facts API](https://www.zero.xyz/c/av-it-device-integration-facts-api-2d2096d7/llms.txt): $0.03/call via x402. Returns control protocol, transport, TCP/UDP port, connection notes, and field-tested gotchas for professional AV, lighting, shading, and network devices by manufacturer and model. - [GTIN / EAN / UPC Barcode Check-Digit Validator](https://www.zero.xyz/c/gtin-ean-upc-barcode-check-digit-validator-061f0eed/llms.txt): $0.002/call via x402. Validates GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), and GTIN-14 barcodes using GS1 MOD-10 check-digit algorithm and identifies the barcode type. - [Payment Card Structural Validation (Luhn + Brand + BIN)](https://www.zero.xyz/c/payment-card-structural-validation-luhn-brand-bin-5d475874/llms.txt): $0.002/call via x402. Validates a payment card number's structure via Luhn checksum, detects card brand (Visa/Mastercard/Amex/Discover/Diners/JCB), and extracts BIN and last4 digits — without verifying the card actually exists. - [ECB EUR Foreign Exchange Reference Rates](https://www.zero.xyz/c/ecb-eur-foreign-exchange-reference-rates-036d8729/llms.txt): $0.002/call via x402. Returns the latest European Central Bank daily reference rate for any supported currency versus EUR, plus supports cross-rate conversion between two non-EUR currencies. - [IBAN Validation (ISO 13616 MOD-97)](https://www.zero.xyz/c/iban-validation-iso-13616-mod-97-bc3a9291/llms.txt): $0.002/call via x402. Validates an IBAN using MOD-97 checksum, structural checks, and country-length verification against the IBAN registry, returning validity status, country, and diagnostic details. - [RDAP Domain Registration Lookup](https://www.zero.xyz/c/rdap-domain-registration-lookup-82e3c2f3/llms.txt): $0.005/call via x402. Checks whether a domain name is registered or available and returns authoritative RDAP registry data including registrar, dates, nameservers, and status flags. - [IPv4 CIDR Calculator](https://www.zero.xyz/c/ipv4-cidr-calculator-94309bf3/llms.txt): $0.002/call via x402. Calculates IPv4 network properties from a CIDR notation input: network address, broadcast address, netmask, wildcard, usable host range and count, with optional IP membership check. - [Avent Tech Color Converter](https://www.zero.xyz/c/avent-tech-color-converter-1638b283/llms.txt): $0.002/call via x402. Converts a hex or rgb() color value into hex, RGB, HSL, approximate relative luminance, and best text contrast color (black or white). - [User-Agent String Parser](https://www.zero.xyz/c/user-agent-string-parser-dfc0170e/llms.txt): $0.002/call via x402. Parses a user-agent string into structured browser, engine, OS, device type/vendor/model, CPU architecture, and bot-likelihood fields. - [ISBN Validation API](https://www.zero.xyz/c/isbn-validation-api-2bdbe84d/llms.txt): $0.002/call via x402. Validates ISBN-10 or ISBN-13 numbers, returning whether the identifier is valid and its kind - [ISIN Validation (ISO 6166) – Aventtech](https://www.zero.xyz/c/isin-validation-iso-6166-aventtech-186ccd7d/llms.txt): $0.002/call via x402. Validates a 12-character ISIN code per ISO 6166, checking structure, Luhn check digit, country code, and extracting the embedded NSIN. - [Aventtech Timezone Converter](https://www.zero.xyz/c/aventtech-timezone-converter-8a167410/llms.txt): $0.002/call via x402. Converts a datetime (or the current moment) from one IANA timezone to another, returning both the UTC instant and local wall clock times. - [Email Domain Deliverability Validator](https://www.zero.xyz/c/email-domain-deliverability-validator-a002f851/llms.txt): $0.003/call via x402. Checks an email address for RFC syntax validity and live MX/A DNS deliverability via DNS-over-HTTPS, returning a structured verdict on whether the domain can receive mail. - [QR Code Generator (api.aventtech.com)](https://www.zero.xyz/c/qr-code-generator-api-aventtech-com-f1461f15/llms.txt): $0.003/call via x402. Generates a QR code SVG from any text or URL, with configurable error correction level. - [VIN Validation API (ISO 3779)](https://www.zero.xyz/c/vin-validation-api-iso-3779-ddf77dc2/llms.txt): $0.003/call via x402. Validates a 17-character Vehicle Identification Number (VIN) per ISO 3779, verifying structure, check digit at position 9, and decomposing WMI/VDS/VIS segments with model-year decoding. - [Avent Tech Currency Converter](https://www.zero.xyz/c/avent-tech-currency-converter-e1a16bf1/llms.txt): $0.003/call via x402. Converts a monetary amount from one ISO 4217 currency to another, returning the exchange rate and converted result Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. - [Zero catalog index](https://www.zero.xyz/llms.txt)