x402 census · staging.402utils.com · cd4f68ccc827 · JSON

GET /v1/email-check

unprobed

Validate an email address before you accept a signup or send to it: RFC 5322 syntax, whether the domain resolves and its MX records, whether it is a disposable/throwaway domain (community blocklist), and whether it is a role account (info@, support@…). DNS is checked over DoH. No SMTP probing (intrusive and spammy), so a true 'domainExists' does not guarantee the mailbox exists.

Verdict: not verified by an unpaid GET. not probed yet. This says nothing about whether the route works when called as declared.

Facts from the catalogs

Field Value

URL https://staging.402utils.com/v1/email-check

Method GET

Price $0.003 USDC = 3000 atomic units of 0x036CbD53842c5426634e7929541eC2318f3dCF7e

Network eip155:84532 (base-sepolia) — testnet

payTo 0xc55A2D530b53CBaD1001e4AfD4720B7E71f9C291

Seller staging.402utils.com

Catalogs cdp (row updated 2026-09-22)

Listed since (lower bound) 2026-09-22 (earliest catalog timestamp; catalogs report last-update times only)

Last catalog update 2026-09-22

CDP quality counters 1 calls and 1 unique payers in 30 days, last call 2026-09-22 (catalog-reported, not verified on chain)

Category (keyword rule) domains/dns

Templated path no

x402Version in catalog 2

Service name / tags none

Unpaid probe (census of )

Field

Value

Probe

not probed in this build

No hourly re-probe has reached this resource yet; the cron covers a rotating slice of 150 per hour.

On-chain facts for the payTo (public address)

Field Value

Distinct payers 43

Payments 69

USDC volume $0.17

Median payment $0.002

First / last payment 2026-07-05 / 2026-09-30

Sampler-shaped share of payments 100.0%

Payers that are not samplers 0

Source forensics-2026-09-30

Address 0xc55A2D530b53CBaD1001e4AfD4720B7E71f9C291 (contract: EIP7702Proxy)

Declared input and output (extensions.bazaar)

{
 "input": {
  "method": "GET",
  "queryParams": {
   "email": "user@example.com"
  },
  "type": "http"
 },
 "output": {
  "type": "json",
  "example": {
   "checkedAt": "2026-07-04T00:00:00.000Z",
   "disposable": false,
   "domainExists": true,
   "email": "user@example.com",
   "mxRecords": [
    "mx1.example.com"
   ],
   "roleAccount": false,
   "syntaxValid": true
  }
 }
}

Try it (unpaid: shows the 402)

curl -si -X GET 'https://staging.402utils.com/v1/email-check' -H 'accept: application/json'

The catalog declares GET. A 402 answer carries the payment requirements in the JSON body and, for x402 v2, base64 in the PAYMENT-REQUIRED header. This page never sends a payment.

Paid checks (x402, USDC on Base)

GET https://bazaar.agentexchange.work/r/cd4f68ccc827/probe.json re-runs this probe right now for $0.01 and writes the result here. POST https://bazaar.agentexchange.work/featured with {"id":"cd4f68ccc827"} places this resource at the top of the report and search pages for 30 days for $1.00, labelled. Unpaid requests answer 402 with the terms. Pricing.

Catalog references: agentic.market (CDP Bazaar front end) · this record as JSON · all resources on staging.402utils.com.