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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchBefore listing an API that uses x402, validate two separate things: the live v2 payment requirements and any optional discovery metadata. Then exercise each advertised route with the intended client and facilitator or local verifier. A valid-looking listing is not proof that a payment authorization is valid or that settlement will succeed.
1. Confirm the listing uses x402 v2
For a new v2 listing, check that the payment-required response has x402Version set to 2, a resource object, and an accepts array containing the offered payment requirements. Use the x402 v2 specification as the protocol reference. Pin the specification or SDK version used by your implementation, because the documentation is maintained on a moving repository branch.
Do not accept a v1 response shape as though it were v2. The versions use different field names and placement, so a validator should check the intended version explicitly rather than treating similar-looking payloads as interchangeable.
2. Check the resource and payment terms
Resource identity and description
Verify that resource.url points to the public route being protected—not a staging URL, internal hostname, or neighboring endpoint. Check that its description and MIME type accurately describe the paid response a client receives.
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#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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Every payment option
For each item in accepts, compare the actual values with the offer you intend to make:
scheme: the payment scheme your implementation supports.network: the intended CAIP-2 network identifier.amount: the price in atomic units, checked against the intended price and asset decimals.asset: the asset the client is expected to pay.payTo: the correct recipient address or identifier.maxTimeoutSeconds: a timeout suitable for the payment and request flow.
Confirm that the facilitator or local implementation supports the scheme and network combination. These fields can be syntactically valid while still encoding the wrong price, asset, recipient, or timeout.
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- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
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- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
3. Validate optional Bazaar discovery metadata
x402 v2 ResourceInfo can include serviceName, tags, and iconUrl. These fields are optional; if you include them, validate the documented bounds in the Bazaar extension guide:
serviceName: no more than 32 printable ASCII characters.tags: no more than five tags, each no more than 32 printable ASCII characters.iconUrl: an absolute HTTP or HTTPS URL no longer than 2,048 characters. The guide also restricts icon URLs to avoid IP literals and loopback hostnames.
Facilitators may silently discard an invalid metadata field while preserving the rest. The guide describes this as a “soft-drop” rule: an over-limit or otherwise invalid field may disappear without preventing the other metadata from being retained. Therefore, check the metadata that is actually emitted and accepted rather than assuming that a submitted field will appear in discovery.
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- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
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- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
4. Make discovery details match the working API
For each advertised route, compare the Bazaar description with what the route really accepts and returns. Check its HTTP method, parameter names and meanings, input schema, output example, and output schema. The Bazaar guide shows how to describe these structures, but a schema or example does not establish that the endpoint works.
- Use descriptions that explain what each parameter does.
- Keep examples representative of real route behavior.
- Do not put secrets or personal identifiers in descriptions or examples.
- Test the route using the same request shape clients will use.
5. Run a live preflight for each route
- Call the route without payment. Inspect the HTTP 402 response and its encoded
PAYMENT-REQUIREDdata. Check the version, resource, and offered payment terms against the values you intend to publish. - Submit a paid request with the intended client. Use the facilitator or local verifier that will serve the integration, and check that it supports the offered scheme and network.
- Inspect the outcome. Confirm that the client receives the protected API response and that the payment path reports the expected result. A metadata check alone cannot establish successful verification or settlement.
If you use Cloudflare’s gateway integration, follow its x402 documentation for its origin-validation design. That integration requires the origin to validate the signed PAYMENT-CONTEXT token before serving the request. This header is specific to that Cloudflare design, not a universal x402 requirement.
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- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
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- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
6. Keep metadata checks separate from payment security
Metadata validation checks structure, values, and whether the listing describes the route accurately. Payment verification checks whether an authorization is valid and whether payment can be settled. Treat them as separate gates.
The x402 v2 specification’s default flow is verify, resource, settle, then response. Other payment flows may order checks differently, but the specification requires a verify or settle check before resource execution. As the specification puts it, “The resource never executes with nothing checked.” Schema validation is not that payment check.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
