Discover / api.inboxguardstest.com

InboxGuards Email Test

■ Challenge detected

InboxGuards Email Test: Email address check: syntax, MX, disposable and role account (no SMTP probe). Checks one address without sending mail: RFC syntax, whether the domain accepts mail (MX, null MX, implicit A/AAAA), disposable domain (CC0 list), role account (info@, support@...), free provider. Verdict ok / risky / undeliverable. No SMTP probe, so mailbox existence is not confirmed. Bad syntax: 400, never charged.

Listed price
$0.005
Challenge detected
5 of the last 5 checks
Median response
830 ms
Last checked
16 Oct, 23:40 UTC
In our index since
10 Oct 2026

Endpoint

curl -i https://api.inboxguardstest.com/v1/email-check
# 402 Payment Required: pay with an x402 client (USDC on Base),
# then send the same request again with the payment attached.
3 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.

Base URLhttps://api.inboxguardstest.com/v1

  • GET/email-check$0.005InboxGuards Email Test: Email address check: syntax, MX, disposable and role account (no SMTP probe). Checks one address without sending mail: RFC syntax, whether the domain accepts mail (MX, null MX, implicit A/AAAA), disposable domain (CC0 list), role account (info@, support@...), free provider. Verdict ok / risky / undeliverable. No SMTP probe, so mailbox existence is not confirmed. Bad syntax: 400, never charged.
  • GET/fix-plan$1InboxGuards Email Test: Email security fix plan: the exact SPF, DKIM and DMARC records to publish, with steps for your DNS host. Reads the domain's live MX, NS, SPF, DKIM and DMARC records, detects the mailbox provider and DNS host, and returns the exact records to publish in order (create / replace / keep, name, value, why): one merged SPF within the 10-lookup limit, DKIM records or the provider console path, and a staged DMARC policy (none -> quarantine -> reject). Non-sending domains get a lo
  • GET/report$0.05InboxGuards Email Test: Email deliverability and security report for a real email you sent. 1) POST /v1/tests (free) for a one-time address + read token. 2) Send one real email to it. 3) GET this with ?test_id= and X-Read-Token. Report: SPF, DKIM (key size, alignment), DMARC, ARC, BIMI, sending IP rDNS + SpamCop, MTA-STS/TLS-RPT, one-click unsubscribe, headers, content, 0-100 score, top fixes. Not-ready/unknown tests: 4xx, never charged.

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

Showing 3 of 3 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/api.inboxguardstest.com

Recent checks

10 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 5 checks
When (UTC)ResultHTTPResponse
16 Oct, 23:40 UTCChallenge detected402879ms
15 Oct, 19:10 UTCChallenge detected402957ms
14 Oct, 14:31 UTCChallenge detected402830ms
12 Oct, 06:05 UTCChallenge detected402385ms
10 Oct, 12:38 UTCChallenge detected402586ms

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 InboxGuards Email Test?

Its listed price is $0.005.

What payment terms does InboxGuards Email Test 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 InboxGuards Email Test listed?

In x402 Bazaar and x402-list.com. Superstables first indexed it on 10 Oct 2026.

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