Validate an x402.json payment manifest before you ship it. Everything runs locally in your browser — nothing is uploaded.
A stale or wrong payTo silently misroutes every payment. Common failure modes: hardcoded constant diverges from the served 402 challenge, checksummed vs lowercase mismatch, wrong network (eip155:8453 = Base Mainnet), zero-value prices (facilitators reject $0 challenges — use charge-and-rebate instead).
RAEN runs 12 paid x402 services on Base — law lookup, ticker analysis, dispute letters, image generation, contract analysis and more — with a free-first-call charge-and-rebate trial (net $0). Try one via MCP: raen-mcp-gateway.fly.dev/mcp.
raen.royalruby.io · raen-mcp on GitHub · x402 Cookbook · x402 Readiness Scorecard