Pay-per-call MCP server. $0.03 USDC sends one transactional SMS to a US phone number via x402.
Connect Runs on your machine
claude mcp add x402-sms -e BUYER_PRIVATE_KEY=<BUYER_PRIVATE_KEY> -- npx -y [email protected]{
"mcpServers": {
"x402-sms": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>"
}
}
}
}{
"mcpServers": {
"x402-sms": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>"
}
}
}
}{
"servers": {
"x402-sms": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"BUYER_PRIVATE_KEY": "<BUYER_PRIVATE_KEY>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
BUYER_PRIVATE_KEYRequired, secret | Ethereum private key for the buyer wallet that pays the per-call USDC fee. |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 15 May 2026 |
| Last updated | 15 May 2026 |
| Registry name | io.github.UltraStarz/x402-sms |
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