proof402 Python middleware — legacy reference

This page formerly presented 402Proof and RLUSD/XRPL middleware as current ScriptMasterLabs payment infrastructure. That description is retired.

Current authority: x402 v2 · Base mainnet eip155:8453 · USDC · live endpoint-issued HTTP 402 requirements. A 402 challenge is not proof of payment; only verified settlement plus accepted delivery counts.

See the AI Agent API Evidence hub, x402 protocol guide, and current MCP stack for active machine surfaces.