Discover / x402-qr-api.vercel.app

x402-qr-api.vercel.app

■ Challenge detected

Validate an email address: format check plus a live MX record lookup on its domain

x402
Base
USDC

Listed price: $0.002
Challenge detected: 9 of the last 9 checks
Median response: 114 ms
Last checked: 16 Oct, 23:40 UTC
In our index since: 3 Oct 2026

Endpoint

curl -i https://x402-qr-api.vercel.app/api/validate
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.

1 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

GEThttps://x402-qr-api.vercel.app/api/validate$0.002Validate an email address: format check plus a live MX record lookup on its domain

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 1 of 1 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/x402-qr-api.vercel.app

Recent checks

3 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026

All 9 checks

When (UTC)	Result	HTTP	Response
16 Oct, 23:40 UTC	Challenge detected	402	963ms
15 Oct, 19:10 UTC	Challenge detected	402	964ms
14 Oct, 14:31 UTC	Challenge detected	402	61ms
12 Oct, 06:05 UTC	Challenge detected	402	115ms
10 Oct, 12:38 UTC	Challenge detected	402	88ms
9 Oct, 09:34 UTC	Challenge detected	402	77ms
8 Oct, 06:42 UTC	Challenge detected	402	114ms
7 Oct, 03:32 UTC	Challenge detected	402	181ms
3 Oct, 17:05 UTC	Challenge detected	402	65ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 23:40 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for x402-qr-api.vercel.app?

Its listed price is $0.002.

What payment terms does x402-qr-api.vercel.app advertise?

The listing advertises x402, Base and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is x402-qr-api.vercel.app listed?

In x402 Bazaar. Superstables first indexed it on 3 Oct 2026.

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