These sites fingerprint TLS, headers and IP reputation. Naive scrapers get 403ed instantly.
Python agents (LangChain, AutoGen, raw requests) all fail on Stripe's bot wall. One POST to Plaza's x402 endpoint returns parsed JSON instead of a 403.
POST https://x402-plaza-services.onrender.com/mcp - x402 payment in USDC on Base. Catalog: https://x402-plaza-services.onrender.com/catalog
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