x402 sms for Claude Code

io.github.ultrastarz/x402-sms

Pay-per-call MCP server. $0.03 USDC sends one transactional SMS to a US phone number via x402.

client:Claude Code transport:stdio runtime:npm

Install x402 sms in Claude Code

run in your project directory

claude mcp add x402-sms -e BUYER_PRIVATE_KEY=<BUYER_PRIVATE_KEY> -- npx -y x402-sms-mcp

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs