npm · @true402.dev/mcp-server
$npx -y @true402.dev/mcp-server@1.0.4 WALLET_PRIVATE_KEY · secret — Funded Base wallet private key for x402 payment signing (optional; without it, paid tools return the 402 requirements).
SERVER_URL — true402 API base (default https://true402.dev/api). Must be https (or localhost) — the signer refuses to send a payment over cleartext.
MAX_PAYMENT_USDC — Client-side per-call spend ceiling in USDC (default 0.10). The signer refuses to auto-pay a 402 whose amount exceeds this — protects the wallet from a hostile endpoint.