SMS Validator API MCP Server

by br0ski777 Your server? Claim it

not responding

SMS Validator API is listed as active in the registry but did not answer our last check. It exposes 1 tools. Last commit 2 Sep 2026.

Validate SMS-capable phone numbers â€” mobile vs landline, E.164 format. x402 micropayment.

Uptime history 51 days of history · worst day 0%

51 days agonow

0.0%

Uptime 24h

0 of 91 checks

Tools

read from the server

204 ms

Response time

average over 24h

Stars

last commit 2 Sep 2026

SMS Validator API does not always answer

Over the last week it answered 29.7% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add sms-validator --transport http https://sms-validator.api.klymax402.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "sms-validator": {
      "url": "https://sms-validator.api.klymax402.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.sms-validator]
url = "https://sms-validator.api.klymax402.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "sms-validator": {
      "url": "https://sms-validator.api.klymax402.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "sms-validator": {
      "url": "https://sms-validator.api.klymax402.com/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

sms

sms_validate_number

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 formatted number 4. countryCode 5. numberType (mobile/landline/voip/toll-free) 6. carrier name. Example output: {"phone":"+14155551234","canReceiveSMS":true,"carrierType":"mobile","e164":"+14155551234","countryCode":"US","numberType":"mobile","carrier":"T-Mobile"} Use this BEFORE sending SMS campaigns, FOR filtering landlines from SMS lists, verifying 2FA phone numbers, and OTP delivery validation. Do NOT use for full phone validation with carrier lookup -- use phone_validate_number instead. Do NOT use for email validation -- use email_verify_address instead. Do NOT use for address validation -- use address_validate instead.

Endpoints

URL	Transport	State	Latency	Checked
https://sms-validator.api.klymax402.com/mcp	sse	answering	204 ms	7 min ago

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SMS Validator API — questions

Answers built from our own checks of this server.

What can SMS Validator API do?

It exposes 1 tools, read directly from the server on our last check. Among them: sms_validate_number. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is SMS Validator API working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 91 checks got a reply (0.0%), average response time 204 ms. The bar chart above shows every period we have measured.

The registry lists SMS Validator API as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

How do I connect SMS Validator API?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does SMS Validator API need an API key?

No. SMS Validator API completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

Is SMS Validator API open source?

Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.