Free developer tool · x402 v2

Inspect an unsigned payment challenge

Paste the PAYMENT-REQUIRED header value or its decoded JSON. Inspect basic payment and Bazaar JSON-output structure without connecting a wallet.

Inspection runs in this browser. This tool does not upload or save your pasted input. Paste only the unsigned challenge—not a PAYMENT-SIGNATURE, API key or wallet secret.

No endpoint is contacted. Full JSON Schema validation, signature checks, successful settlement and paid delivery are not tested. Official Bazaar guidance.

Need help interpreting a result?

Bring a redacted result to the public debug thread, or describe a specific blocker privately. A deeper diagnostic requires an agreed scope; using this tool creates no order.