# Step 10 — make x402 actually return 402

Publishing /.well-known/x402.json is not enough: the protected route itself must answer HTTP 402 with the full accepts[] set when no X-PAYMENT header is present. If /api/v1 returns 200, the check fails — proxy that path to the paid resource and pass the upstream status through verbatim.

Canonical: https://robauto.ai/learn/advanced-agentic-commerce/12

_Advanced Agentic Commerce: Ship the Full Agent Surface — lesson 12 of 20 (PLAYBOOK)_

Publishing /.well-known/x402.json is not enough: the protected route itself must answer HTTP 402 with the full accepts[] set when no X-PAYMENT header is present. If /api/v1 returns 200, the check fails — proxy that path to the paid resource and pass the upstream status through verbatim.

Source: [x402 documentation](https://docs.x402.org?utm_source=robauto)

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Machine surfaces: https://robauto.ai/llms.txt · https://robauto.ai/llms-full.txt · https://robauto.ai/.well-known/api-catalog