x402 V2 · PUBLIC UNSIGNED QUOTES · NO ACCOUNT
Read the payment request before you sign it.
A 402 response is a price quote, not a receipt or a guarantee. Decode a PAYMENT-REQUIRED header or JSON on your device and inspect the payment scheme, chain, token, amount and recipient. The free checker never contacts the merchant or uses your wallet.
Free public quote inspector
$0No wallet, account, tracking or remote fetch.Optional hosted static report
0.01 USDCOne explicit x402 payment on Base, no subscription.Important: A structurally valid payment quote can still point to a malicious seller or a service that never delivers. Check the seller independently. Never paste private keys, signed payment payloads, wallet seeds, bearer tokens or customer secrets.
FREE · LOCAL ONLY
Inspect a public unsigned x402 quote
A deliberately fictitious example.invalid quote is preloaded. Paste the public, unsigned PAYMENT-REQUIRED base64 header or raw JSON you want to analyze (maximum 3,800 characters). This form never sends your input to a remote URL until you separately opt into a paid report.
Use only information a public merchant deliberately exposes to anyone in an HTTP 402 response. Do not paste your wallet's signed authorization or any private buyer data.
Free checks are deliberately limited to structural consistency. They do not fetch the URL, verify who owns the payee address, simulate a transaction, test facilitator settlement or confirm product delivery.
OPTIONAL · USER AUTHORIZED
Run the hosted 0.01 USDC rule-based review
The existing VM5 x402 API can return a more detailed machine-readable structural review of the **public unsigned** quote you choose to share. This is not an audit or token-safety service. The first request gets a real 402 price quote; **the quote content is sent to VM5 only after you tick the first consent box**, before any wallet signature. Only proceed with material that is already public and nonsecret.
The page blocks wallet authorization if the seller suddenly changes the 0.01 price, recipient, token, network, resource URL or signing domain.
For paid use, a compatible EIP-1193 wallet such as MetaMask is needed. A user must inspect and approve a fixed-amount, short-lived EIP-712/EIP-3009 transfer authorization. The website never reads private keys, executes an unlimited ERC-20 approval, stakes assets or automatically retries a signed payment. No actual independent human payment was verified when this page was published.
View the payment on BaseScan ↗WHEN IS THIS USEFUL?
Debug the payment request, not the merchant's intentions.
When an x402 client fails, start by checking the protocol version, accepted network, token contract, atomic amount and recipient format. A quote may be correctly formed even if the vendor is offline, the wallet cannot sign that asset, the facilitator is unavailable, or the service is dishonest. These are separate problems requiring separate verification.
Try the original free fictional x402 quote example or inspect the existing pay-per-call API documentation.
NO INCOME CLAIMS
What we actually tested
This is an original AI-assisted browser tool built by a single human-owned VM5 studio. Its static parser uses no RPC and has no remote URL fetching. The optional hosted endpoint is an existing VM5 service at GET /v1/x402-preflight; it returns a genuine x402 v2 HTTP 402 price quote for 0.01 USDC. A signed buyer-to-facilitator settlement for this new human page is not independently verified.
An unsigned payment request can never establish that the merchant is trustworthy. Protect your own wallet and validate the token, seller identity, destination URL and actual delivery separately. This tool is not investment, legal, security, tax or financial advice.
REAL USE > UNSOLICITED ADS
What stopped you from using this for a real task?
We would rather fix an actual crypto/payment/developer pain point than add more speculative features. Try the free checker first. Then tell us which output you needed, what failed, and whether a verified report would be worth paying for. All feedback is optional and costs nothing.
Share a real user problem or blocker (public GitHub form) →
Never submit wallet seeds, EIP-712 signatures, customer CSV/YAML, credentials, nonpublic transactions or other sensitive data. This feedback form does not authorize any USDC transaction, contract or payment.