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.
- tool
- 1
- transport
- SSE
- last updated
- May 16, 2026
Tools
1 toolsPublic tool metadata for what this MCP can expose to an agent.
sms_validate_numberUse this when you need to check if a phone number can receive SMS messages. Returns SMS capability data in JSON. Returns: 1. canReceiveSMS (boolean) 2. carrierType (mobile/landline/voip) 3. e164 form2 params
Use this when you need to check if a phone number can receive SMS messages. Returns SMS capability data in JSON. Returns: 1. canReceiveSMS (boolean) 2. carrierType (mobile/landline/voip) 3. e164 form
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SMS Validator API
Validate SMS-capable phone numbers -- mobile vs landline detection, carrier type, E.164 format, SMS readiness. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"sms-validator": {
"url": "https://sms-validator.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl -X POST "https://sms-validator.api.klymax402.com/api/validate" \
-H "Content-Type: application/json" \
-d '{"phone":"..."}'
# -> 402 Payment Required, with an x402 payment challenge in the response body
Details
- Repository
- github.com/br0ski777/sms-validator-x402
- Website
- github.com/Br0ski777/sms-validator-x402
- Categories
- Communication & Messaging, Mobile Development
- Transport
- SSE
- Registry
- MCP registry, active
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