AVT x402 Data Services

Gold402 Verified. Hand-reviewed and on the curated list — curation is the bar.

16 pay-per-call data and validation APIs: field-verified AV/IT device-integration knowledge base (curated by working systems integrators), IBAN / EU-VAT (VIES) / email / phone / card / GTIN validation, DNS and RDAP domain lookup, timezone and ECB currency conversion. $0.002–$0.03 USDC on Base; free catalog, llms.txt, and OpenAPI. ([llms.txt](https://api.aventtech.com/llms.txt)) ([MCP server](https://github.com/ttsempelis/avt-x402-mcp))