Question 1

What is proof402-middleware?

Accepted Answer

It is x402 / HTTP-402 paywall middleware that lets autonomous AI agents pay per request in USDC on Base. It provides drop-in monetization for MCP servers and APIs and is published on npm.

Question 2

How do AI agents pay with x402?

Accepted Answer

When an agent requests a protected endpoint, the server returns HTTP 402 Payment Required with payment details. The agent pays in USDC on Base, then retries the request and is served the response. No human is in the loop.

Question 3

Does it support XRPL or Xahau?

Accepted Answer

ScriptMasterLabs builds payment rails on XRPL and Xahau (via Xahau Hooks) alongside the x402 USDC-on-Base fast path, so agents can settle on the network that fits the use case.

SML Product	x402 Price	Chain	MCP Tool
Agent Credit Bureau — report	0.05 RLUSD	XRPL	proof_credit_score
Agent Credit Bureau — batch	0.01 RLUSD/wallet	XRPL	proof_credit_score
Ghost Layer — stealth route	x402 micropayment	XRPL · Base	ghost_route
CrawlToll — web fetch	x402 micropayment	XRPL	crawl_paid_fetch
MCP-x402 tools	x402 per call	XRPL · Base	51 tools

ScriptMasterLabs | x402 Paywall

x402 Paywall — How Pricing Works