Checks an email address without sending mail: syntax rules (IDN domains in

Checks an email address without sending mail: syntax rules (IDN domains in punycode and Unicode), MX records by preference, null MX (RFC 7505), implicit A/AAAA fallback, NXDOMAIN, SPF and DMARC policy, disposable, role, free-webmail and +tag flags, mail provider from MX hosts, and typo suggestions for popular domains. Returns a verdict and 0-100 score with reasons. Mailbox existence is not confirmed. Sources: Cloudflare DNS over HTTPS, disposable-email-domains (CC0).

1 route settlement-verified · $0.002 USDC/request · 1 endpoint · Data · base network · x402 protocol

Verified routes

• GET /v1/email/verify · $0.002 · Verified with a $0.002 test payment on 14 Nov 2026 · receipt

Other routes are unverified.

Networks: Base (settlement-verified), Avalanche (accepted)

Discovery is free. Agents search the catalogue here. Payment happens on the listing 402, not on PayAPI.

url https://payapi.market/mcp

Listing facts

Provider

Drug card for a generic or brand name: NLM RxNorm concept (RxCUI, ingredients,

Hosted at

api.kit-rx.com

Category

Data

Price

$0.002 USDC per request

Payment networks

Base, Avalanche

Settlement-verified

1 route, last checked 2026-11-14

Listed on PayAPI Market

2026-11-14

Try Checks an email address without sending mail: syntax rules (IDN domains in

Call a verified route without paying first. The server should answer HTTP 402 Payment Required with the price, the USDC asset, the network and the wallet to pay. An x402 client pays that amount on Base and retries with the payment header.

curl -i "https://api.kit-rx.com/v1/email/verify"

About this API

Checks an email address without sending mail: syntax rules (IDN domains in is listed in the Data category with pricing at $0.002 USDC/request. One route has been settlement-verified by PayAPI Market on 2026-11-14. View receipt on Basescan.

Payments settle on base in USDC via the x402 protocol. AI agents discover this API through the PayAPI Market MCP server and pay per request without API keys or accounts.

This API exposes 1 endpoint.

Add this badge to your README

Paste this on your site. The link points at this listing. Listing is free and PayAPI takes 0% of each job.

Markdown

[![Settlement-verified on PayAPI Market](https://payapi.market/badge/checks-an-email-address-without-sending-mail-syntax-rules-idn-domains-in.svg)](https://payapi.market/api/checks-an-email-address-without-sending-mail-syntax-rules-idn-domains-in)

HTML

<a href="https://payapi.market/api/checks-an-email-address-without-sending-mail-syntax-rules-idn-domains-in"><img src="https://payapi.market/badge/checks-an-email-address-without-sending-mail-syntax-rules-idn-domains-in.svg" alt="Settlement-verified on PayAPI Market" height="20"></a>

What this badge means

Questions about this API

What does Checks an email address without sending mail: syntax rules (IDN domains in do?

Checks an email address without sending mail: syntax rules (IDN domains in punycode and Unicode), MX records by preference, null MX (RFC 7505), implicit A/AAAA fallback, NXDOMAIN, SPF and DMARC policy, disposable, role, free-webmail and +tag flags, mail provider from MX hosts, and typo suggestions for popular domains. Returns a verdict and 0-100 score with reasons. Mailbox existence is not confirmed. Sources: Cloudflare DNS over HTTPS, disposable-email-domains (CC0). It is provided by Drug card for a generic or brand name: NLM RxNorm concept (RxCUI, ingredients,.

How much does Checks an email address without sending mail: syntax rules (IDN domains in cost?

Checks an email address without sending mail: syntax rules (IDN domains in is priced at $0.002 USDC per request, paid per call with no subscription. Verified with a $0.002 test payment on 14 Nov 2026. The exact amount for each call is in the HTTP 402 response before any money moves.

Do I need an API key or account to use Checks an email address without sending mail: syntax rules (IDN domains in?

No. Checks an email address without sending mail: syntax rules (IDN domains in uses the x402 protocol, so an agent pays per request in USDC on Base, Avalanche and gets the response, with no API key, account or signup.

Has Checks an email address without sending mail: syntax rules (IDN domains in been verified?

Yes, 1 route. PayAPI Market paid for a real call from its own wallet, received real data back and recorded the USDC settlement on-chain, most recently on 2026-11-14.

How does an AI agent find Checks an email address without sending mail: syntax rules (IDN domains in?

Through the free PayAPI Market MCP server at https://payapi.market/mcp, using search_apis or get_api, or over plain HTTP at https://payapi.market/agent/search. Discovery is free; the agent pays the provider directly on the listing's own 402.

More Data APIs · Browse the marketplace · List your own API

Related APIs

• Solana validator stats: List Solana validators ranked by stake, vote credits, · 1 route verified · Solana validator stats: List Solana validators ranked by stake, vote credits, skip rate or commission, with filters.
• Call before a German home-office deduction · 1 route verified · Call before a German home-office deduction. Returns the daily flat rate times days, capped at 1260 euro, for 2026.
• Call before a German commuting claim · 1 route verified · Call before a German commuting claim. Multiplies shortest-road km by the 0.38 euro rate and applies the 4500 euro cap for 2026.
• Call before a German travel expense claim · 1 route verified · Call before a German travel expense claim. Returns the domestic meal allowance per day type for 2026 from § 9 Abs. 4a EStG.
• Call before booking a low-value asset in Germany · 1 route verified · Call before booking a low-value asset in Germany. Returns whether immediate write-off (up to 800 euro) or the pool (above 250 up to 1000 euro) is allowed for 2026.
• Call before booking a German business gift or hospitality cost · 1 route verified · Call before booking a German business gift or hospitality cost. Applies the § 4 Abs. 5 EStG 50-euro gift limit or the 70 percent hospitality share.

More from Drug card for a generic or brand name: NLM RxNorm concept (RxCUI, ingredients,

• Decodes the x402 v2 PAYMENT-SIGNATURE header sent with the request into a
• Due-diligence report on a website, merchant or counterparty domain: registrable
• Geocodes a one-line US address, or reverse-geocodes a lat/lon point, to
• Latest CMS NADAC (National Average Drug Acquisition Cost) per-unit prices for a
• Full product record for one package NDC: normalized NDC forms; RxNav status,
• View all from Drug card for a generic or brand name: NLM RxNorm concept (RxCUI, ingredients,

By Drug card for a generic or brand name: NLM RxNorm concept (RxCUI, ingredients,