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Pay-per-call MCP server. $0.03 USDC sends one transactional SMS to a US phone number via x402.
npx @getmcp/cli add io.github.UltraStarz/x402-smsRequires Node.js 18+. Community-contributed server. Review source before installing.
BUYER_PRIVATE_KEYEthereum private key for the buyer wallet that pays the per-call USDC fee.
Config file: ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"io.github.UltraStarz/x402-sms": {
"command": "npx",
"args": [
"-y",
"x402-sms-mcp"
],
"env": {
"BUYER_PRIVATE_KEY": ""
}
}
}
}