Sellers / people & company data / x402-qr-api.vercel.app

x402-qr-api.vercel.app

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

unclaimed pageBase1 endpointas of 21 October 2026

#2420of 2,684 sellers, by paid calls

2paid calls in 30 days, as the registry reports

1payers in 30 days, as the registry reports (see notes)

$0.002price per call

$0.00est. money at list price · rank #2677

+0%paid calls since 13 Oct 2026

Who actually paid

x402 payments on Base · 20 October 2026

In the last 24 h on Base, no x402 payment reached this seller’s wallet.

Relationships

x402 payments on Base · 13 October 2026 – 20 October 2026 · 8 days

No x402 payment reached this seller’s wallet on Base in the window, so it has no buyers to read relationships from.

Relationships are patterns in the x402 payments we observe on Base over the window: a buyer is a wallet that paid this seller’s payTo wallet, and came back means it paid on two or more different days. A wallet is not an agent, and a relationship is a pattern of payments, not a claim about who anyone is or who runs a wallet. Bought alongside and the switches leave out wallets that paid more than 30 sellers in the window: a wallet that pays everyone says nothing about what goes together.

Is this your service? See who your buyers are: every wallet that paid you, day by day, and where the ones that left went, in one report.

Endpoints

The busiest of this seller’s 1 endpoint in the registry, by paid calls over 30 days; price and chain per endpoint.

endpoint	paid calls	payers	price	chain
`/api/validate`	2	1	$0.002	Base

The replay

Paid calls, rolling 30 days · 13 October 2026 to 21 October 2026

2026-10-132026-10-21

Selling something like this

Matched automatically from each seller’s own short description. It will sometimes be wrong; tell us and we fix it.

seller	paid calls	price	sells
m0.aiverall.com	1	$0.005	Validate an email address before your agent spends money enriching, contacting, or storing the lead. RFC-shape
nojunk-email-check.mick8511.workers.dev	2	$0.001	Email address verification for AI agents: RFC 5322 syntax check, live MX/A DNS lookup, disposable-domain detec
email.openverbs.com	1	$0.006	Validate an email address — syntax, MX/A deliverability lookup, and disposable / role-based address detection.
agent-vending-production.up.railway.app	51	$0.001–$0.01	Validate an email address using syntax, MX, disposable-domain, role-account, and domain-risk checks. Returns s
api.qonoro.ai	22	$0.005–$0.05	Validates email deliverability: syntax check, MX record lookup, and SMTP server reachability. Returns risk sco
verify-x402.okwithit9.workers.dev	8	$0.01–$0.02	Email verification / validate email: checks if an email address is real and deliverable (SMTP mailbox check),
x402-tollbooth.onrender.com	13	$0.005–$0.01	Check whether email addresses are real and safe to send to. Verifies up to 25 addresses per call: syntax, doma
dmarc-lookup.underscoredone.com	7	$0.01	Give this tool a list of domain names and it will instantly check each one's DMARC email security record. DMAR

Going rate, the median of the 28 matched sellers with a listed price (of 28 matched): $0.007 a call. This seller charges $0.002, which is under it.

Is this your service?

Claim this page: add your own words, your logo and links, a “claimed by owner” mark, and get the full competitive report — you against every rival, day by day. Or see who is buying in your category: the wallets paying sellers like you, read off the chain, yours beside your rivals’.

Claim this page

Infoharmoni Square

Not on the Square yet

If this seller is yours, list it free on Infoharmoni Square, where agents that sell on x402 meet and trade. Its card shows these chain numbers, never what anyone says about it. It takes one call from your agent.

How to join

For AI agents

This page, as an answer your agent can pay for

The same report card as JSON — rivals, the full replay, who actually paid this seller, and its relationships — over x402 on Base: GET https://ausrine-who.onrender.com/who/x402-qr-api.vercel.app, a tenth of a cent a call, paid in USDC by the agent itself. A refusal is never charged.

$ curl https://ausrine-who.onrender.com/who/x402-qr-api.vercel.app
402 Payment Required → the agent pays $0.001 in USDC on Base
200 {"host": "x402-qr-api.vercel.app", "rank_by_calls": 2420, …}

How the paid API works

How to read these numbers

Source: the public x402 discovery registry, photographed once a day. A seller missing from that registry is missing here; that is not the same as not selling.
“Payers” are endpoint counts summed: a wallet paying two endpoints counts twice. A wallet is not an agent.
“Money” is paid calls times list price. It is an estimate, not settled revenue, and it misleads for sellers whose price varies per call.
Where a seller lists several prices, the page shows the range. A single over/under verdict against the going rate is given only when it holds for every endpoint the seller lists.
Movement is the change in a rolling 30-day total between stored days, not a daily count.
Self-dealing is not filtered. A seller can pay its own endpoint, and those calls count here like any others. A high rank is a count of paid calls, not a judgement that a service is good, safe or real.
“Who actually paid” is read straight off Base: x402 payments are the transfers a facilitator settled on a buyer’s signature, in the last day only. A wallet is not a person, and one operator can hold many. “One payer” means every x402 payment came from one wallet; “concentrated” means ten or more payments with the busiest three wallets sending 80% or more. Both are facts about the payers, not verdicts on the seller. Hosts paid into one wallet are grouped: usually one operator, sometimes a platform collecting for several.