SMS Validator API

This tool validates phone numbers to determine if they're SMS-capable by distinguishing mobile lines from landlines and checking E.164 format compliance. It runs as a remote MCP server over SSE and operates on a micropayment model through the x402 protocol, meaning you pay per validation request. Reach for this when you're building messaging systems that need to verify numbers before attempting delivery, or when you want to filter contact lists to mobile-only numbers. The repository is light on documentation, but the core value is straightforward: ask if a number can receive texts, get a definitive answer, and pay only for what you query.