X402 Sms runs on your own machine — the client starts it, so there is no endpoint to ping. 33 installs a week from npm. Last commit 6 Oct 2026.
Pay-per-call MCP server. $0.03 USDC sends one transactional SMS to a US phone number via x402.
Nothing serious here today
Today is the operative word: we check X402 Sms every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add x402-sms -e 'BUYER_PRIVATE_KEY=<BUYER_PRIVATE_KEY>' -- npx -y x402-sms-mcp{
"mcpServers": {
"x402-sms": {
"command": "npx",
"args": [
"-y",
"x402-sms-mcp"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>"
}
}
}
}[mcp_servers.x402-sms]
command = "npx"
args = ["-y", "x402-sms-mcp"]
env = { BUYER_PRIVATE_KEY = "<BUYER_PRIVATE_KEY>" }{
"mcpServers": {
"x402-sms": {
"command": "npx",
"args": [
"-y",
"x402-sms-mcp"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>"
}
}
}
}{
"servers": {
"x402-sms": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"x402-sms-mcp"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>"
}
}
}
}Put your own value in place of
<BUYER_PRIVATE_KEY> (Ethereum private key for the buyer wallet that pays the per-call USDC fee).
The author’s registry entry marks it as required.
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X402 Sms — questions
Answers built from our own checks of this server.