Check any domain's email deliverability & health (SPF, DMARC policy, MX provider, WHOIS domain age, hosting, disposable/catch-all, 0-100 score) and verify any email address (SMTP, MX, disposable, role, catch-all). Live data, not a stale database.
{"domain":"stripe.com","score":97,"grade":"high","email":{"provider":"Google Workspace","has_mx":true,"spf":{"present":true,"policy":"soft"},"dmarc":{"present":true,"policy":"reject"},"is_disposable":false},"registration":{"registrar":"SafeNames Ltd.","created":"1995-09-12T04:00:00Z","expires":"2027-09-11T04:00:00Z","age_days":11255},"infra":{"hosting":"AWS Route 53","ips":["198.202.176.161","198.137.150.161"],"has_valid_cert":true},"dns":{"a":["198.202.176.161","198.137.150.161"],"aaaa":[],"mx":["aspmx.l.google.com","alt2.aspmx.l.google.com","alt1.aspmx.l.google.com","aspmx3.googlemail.com","aspmx2.googlemail.com"],"ns":["ns-1087.awsdns-07.org","ns-1882.awsdns-43.co.uk","ns-423.awsdns-52.com","ns-705.awsdns-24.net"],"txt":["asv=8de0c1a866b958297e22a36216e594a6","whimsical=253112f9add9790f3a27b9d9893626451fc4cda1","v=MCPv1; k=ed25519; p=WMeka0C1fIH9HQLMtsSM9DD9cM6Bz6Wz34mHnK86UcM=","facebook-domain-verification=m7id9rt8ehlgcg9tt2yggbsi6gro7i","canva-site-verification=xLypn0D9XANRy-lbwcMfHA","google-site-verification=qjP3OAiraClha_40cX9Z9FrG5q3O_0InXSamXOswY-s","google-site-verification=hPfjsDwiisKJ4RP1ExOst9gAOD_0P8Q7-kxdcKUvEcc","apple-domain-verification=8kIS0gmJTvILWQuI","docusign=4c9f5602-1c19-4e4c-bde7-77dc4b9ea8a0","docusign=4a93db58-af07-4632-a881-b569d41a6c57","h1-domain-verification=KhpNX9YNAc7bX95agGvFsPPKbYTVe1KC6xj7P1zKZrRzxcuS","fastly-domain-delegation-3c9tdnjzdwy7wfffvyyy-786084-2024-07-08","cursor-domain-verification-vncvvm=D0NzeIDbQa8PPgIf1ukp9UPiu","atlassian-domain-verification=upLp21qQgja1aHG2gnAb1AmXRqb/zG0UK1a0n3zTSXZg5DgOSttR3i5uzA3T9Cdk","docker-verification=ccde1a0d-8d2c-44b5-9d20-6c4e19113fc9","MS=ms80697640","_mphpl78cv3thhugki4dkknlukgj1du6","google-site-verification=NLkFgZLHeVMVYlR3t1UZC9_1LzmqCAefJyNDs6ZQqBA","z4mthhzk10l6qc0rg4211mnnppkh2y5b","anthropic-domain-verification-zk7x9c=QfN52ECybLPUWh51R9pKF0QO3","neat-pulse-domain-verification-8GMn8nv=36eba03d-345e-421a-a823-d6d1f28938a4","google-site-verification=pmz8ueKvWMPxNlwUDcVroF91-tq6I9VM6wSO_0i7-wc","postman-domain-verification=c3b168067b16085c452b04b643ae1000079b095e383b53d1074e409b0e600b6265e1c7963beca1ca87cc63c381dcea332544c92c919651e4cda69f9a6303079c","v=spf1 ip4:198.2.180.60/32 ip4:13.111.2.227/32 include:spf1.stripe.com include:greenhouse-outbound-mail.stripe.com include:_spf.qualtrics.com ~all","00D50000000JV6w=1TBTQ0000000CIv;00DDn000000HWol=1TBVY00000002Hx;00D4x000003vxGL=1TBPQ00000008Tp;00Dfn00000BUlWD=1TBan0000000LPR","edcbf4c7-b604-457b-870e-1b05f655e769","google-site-verification=PrlpJHdk11CIkPsiXoHEAJevWHAk39JRFAqVSe9l7n0","liveramp-site-verification=7gyFkTwGYsvgd7IUQwyAOfImETwR06wgKjKiXq90KEY","elevenlabs=NpcIkVJW_8Vyd2gLKzPviuaU1g5rz83KiWQQ3sWKGtI","stripe-verification=82ce82470fb8324e19fa65abdb6fd370da5a8f90bba09712f259760f625d0790","google-site-verification=ZgGi2-xDdfnaWxdfjn5AqtUS11jKWqSXAV_EHODFzdE"],"cname":[]},"subdomains":["answers.stripe.com","api-e1.stripe.com","api-e2.stripe.com","api-nw1.stripe.com","api-nw2.stripe.com","api-nw3.stripe.com","api-tls12.stripe.com","api-w1.stripe.com","api-w2.stripe.com","api.stripe.com","auth.stripe.com","bfcm.stripe.com","bofa-enhanced-issuer-network.stripe.com","bom.corp.stripe.com","book.stripe.com","button.stripe.com","buy.fastly.cdn.stripe.com","buy.stripe.com","cdn.qa-files.stripe.com","checkout-api-modelt.stripe.com","checkout.fastly.cdn.stripe.com","checkout.stripe.com","cmh.corp.stripe.com","codeint.stripe.com","commerce-mcp.stripe.com","connect-js.stripe.com","connections-auth.stripe.com","connections-barclays.stripe.com","connections-sandbox.stripe.com","corp.stripe.com","cpe.corp.stripe.com","cpe.qa.corp.stripe.com","crypto-js.stripe.com","dashboard-admin.stripe.com","dashboard.stripe.com","donate.stripe.com","east.corp.stripe.com","edge-book.stripe.com","edge-button.stripe.com","edge-buy.fastly.cdn.stripe.com","edge-buy.stripe.com","edge-checkout.fastly.cdn.stripe.com","edge-checkout.stripe.com","edge-donate.stripe.com","edge-invoice.fastly.cdn.stripe.com","edge-invoice.stripe.com","edge-js.fastly.cdn.stripe.com","edge-js.stripe.com","files-cdn.stripe.com","fl.corp.stripe.com","fl.qa.corp.stripe.com","g5-api.stripe.com","git.corp.stripe.com","hoth.stripe.com","invoice.fastly.cdn.stripe.com","invoice.stripe.com","ipaddr-3ds.stripe.com","irc.stripe.com","irs-ides-client.stripe.com","jira.corp.stripe.com","jira.qa.corp.stripe.com","js.fastly.cdn.stripe.com","js.stripe.com","jss.corp.stripe.com","jss.prod.corp.stripe.com","jss.qa.corp.stripe.com","local.corp.stripe.com","m.stripe.com","manage.stripe.com","newapi.stripe.com","northwest.corp.stripe.com","not-a-git.corp.stripe.com","panoplied-respect.stripe.com","partner-ideal-prod.stripe.com","partner-ideal-qa.stripe.com","pay-by-bank.stripe.com","pdx.corp.stripe.com","preprod-bfcm.stripe.com","preprod-button.stripe.com","preprod-checkout.stripe.com","preprod-connect-js.stripe.com","preprod-connections-sandbox.stripe.com","preprod-crypto-js.stripe.com","preprod-g5-api.stripe.com","preprod-invoice.stripe.com","preprod-js.stripe.com","preprod-profile.stripe.com","preprod-public-goods.stripe.com","preprod-secure-files.fastly.cdn.stripe.com","preprod-secure-files.stripe.com","preprod-status.stripe.com","preprod-terminal-statics.stripe.com","preprod-trust.stripe.com","prod-connections-bofa.stripe.com","prod-connections-chase.stripe.com","prod-connections-citi-payload.stripe.com","prod-connections-citi.stripe.com","prod-network-citi-payload.stripe.com","prod-network-citi.stripe.com","prod-partner-amex-east-asia-sponsored-merchant.stripe.com","prod-partner-hdfc.stripe.com","profile.stripe.com","public-goods.stripe.com","qa-bfcm.stripe.com","qa-bom.corp.stripe.com","qa-book.stripe.com","qa-button.stripe.com","qa-buy.stripe.com","qa-checkout.stripe.com","qa-cmh.corp.stripe.com","qa-connect-js.stripe.com","qa-connections-bofa.stripe.com","qa-connections-chase.stripe.com","qa-connections-citi-payload.stripe.com","qa-connections-citi.stripe.com","qa-connections-sandbox.stripe.com","qa-crypto-js.stripe.com","qa-donate.stripe.com","qa-east.corp.stripe.com","qa-edge-testing.stripe.com","qa-files-cdn.stripe.com","qa-g5-api.stripe.com","qa-invoice.stripe.com","qa-js.stripe.com","qa-jwt-connections-barclays.stripe.com","qa-m.stripe.com","qa-network-citi-payload.stripe.com","qa-network-citi.stripe.com","qa-northwest.corp.stripe.com","qa-pandora-v2-test.stripe.com","qa-partner-amex-east-asia-sponsored-merchant.stripe.com","qa-partner-hdfc.stripe.com","qa-pdx.corp.stripe.com","qa-profile.stripe.com","qa-public-goods.stripe.com","qa-secure-files.fastly.cdn.stripe.com","qa-secure-files.stripe.com","qa-status.stripe.com","qa-terminal-statics.stripe.com","qa-trust.stripe.com","qa.corp.stripe.com","revoked.stripe.com","sandbox-acs.stripe.com","secure-files.fastly.cdn.stripe.com","secure-files.stripe.com","sessions.stripe.com","static.stripe.com","status.stripe.com","stripe-credit-ui.stripe.com","stripe.com","support.stripe.com","terminal-statics.stripe.com","test-digicert-cert.stripe.com","trust.stripe.com","verificator.stripe.com","www.api.stripe.com","www.sessions.stripe.com","www.stripe.com"],"subdomain_count":158,"fetched_at":"2026-07-07T02:47:59.061Z"}
curl --location --request GET 'https://zylalabs.com/api/13100/email+deliverability+verification+and+domain+health+api/26548/domain+deliverability+and+health+check?domain=stripe.com' --header 'Authorization: Bearer YOUR_API_KEY'
{"email":"[email protected]","status":"risky","deliverable":true,"score":75,"checks":{"syntax":true,"mx":true,"disposable":false,"role_account":false,"free_provider":false,"catch_all":true,"smtp":true},"did_you_mean":null,"verified_at":"2026-07-07T14:32:31.419Z","billed":true}
curl --location --request GET 'https://zylalabs.com/api/13100/email+deliverability+verification+and+domain+health+api/26549/[email protected]' --header 'Authorization: Bearer YOUR_API_KEY'
After signing up, every developer is assigned a personal API access key, a unique combination of letters and digits provided to access to our API endpoint. To authenticate with the Email Deliverability Verification and Domain Health API simply include your bearer token in the Authorization header.
| Header | Description |
|---|---|
Authorization
|
Required
Should be Bearer access_key. See "Your API Access Key" above when you are subscribed.
|
No long-term commitment. Upgrade, downgrade, or cancel anytime. Free Trial includes up to 50 requests.
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Trusted by leading companies
Check any domain's email deliverability and overall domain health in a single API call before you send an email, add it to your CRM, or trust a new signup. Simply send a domain and receive a complete assessment in milliseconds, including email deliverability, domain health, and a unified score from 0 to 100 that makes it easy to decide whether the domain is trustworthy.
The API identifies the email provider such as Google Workspace, Microsoft 365, Zoho, or a self hosted server, verifies SPF and DMARC configurations while returning the actual DMARC policy, checks MX records, and confirms whether the domain is properly configured to send and receive email. It also analyzes domain age, registrar, expiration, TLS certificate validity, hosting provider, CDN, disposable and catch all status, raw DNS records, and subdomains to provide a complete picture of the domain's legitimacy and technical health. Scores between 70 and 100 indicate a healthy, established, and properly configured domain that is safe to email, scores between 40 and 69 suggest a working domain with some potential concerns such as weak email security or a young registration, and scores below 40 highlight domains that are new, disposable, or misconfigured and should be verified before use.
This helps cold email teams avoid wasted sends and protect deliverability, enables lead generation platforms to qualify domains before they enter a CRM, allows applications to block fake or disposable signups in real time, and simplifies deliverability and security audits by validating critical email authentication settings. Unlike other solutions that require multiple services, this API combines domain health, email authentication, mail infrastructure, and trust scoring into one live response while exposing the real DMARC policy instead of a simple yes or no result. It is also designed for AI agents, allowing Claude Code, Cursor, MCP clients, AI SDRs, outreach bots, and automation platforms to understand and use every endpoint directly through machine readable documentation without requiring custom integration logic.
The "Domain Deliverability and Health Check" endpoint returns data on domain health, email deliverability, and a score from 0 to 100. The "Verify Email Address" endpoint provides information on the email's deliverability status, risk level, and various checks like syntax and MX records.
Key fields include "domain," "score," "provider," "has_mx," "spf," "dmarc," "registration," and "infra" for domain checks. For email verification, fields include "email," "status," "deliverable," and "checks" detailing various validation results.
The response data is structured in JSON format, with nested objects for detailed information. For example, the domain check response includes sections for email details, registration info, and infrastructure, while the email verification response includes checks and status.
The domain endpoint provides insights on SPF, DMARC, MX records, domain age, and hosting details. The email verification endpoint checks for syntax, MX records, disposable status, and role accounts, offering a comprehensive view of email validity.
Data accuracy is ensured through live checks against current DNS records and email configurations, rather than relying on a static database. This allows for real-time assessments of domain health and email deliverability.
Typical use cases include validating domains before sending emails, qualifying leads for CRM integration, blocking disposable signups in applications, and conducting security audits on email configurations.
Users can customize requests by specifying the domain or email address they wish to check. The API processes these inputs to return tailored results based on the provided parameters.
Users can expect scores between 0-100, with higher scores indicating better domain health. For email verification, statuses like "deliverable" or "risky" provide quick insights into email validity, helping users make informed decisions.
The email verification endpoint checks for syntax validity, MX record presence, disposable status, role account identification, free provider usage, catch-all status, and SMTP connectivity. This comprehensive assessment helps determine the deliverability and risk level of the email address.
The domain health score ranges from 0 to 100, based on factors such as SPF and DMARC configurations, MX record validity, domain age, and hosting details. Higher scores indicate better email deliverability and domain trustworthiness.
The "status" field in the email verification response indicates the risk level associated with the email address. Possible values include "deliverable," "risky," or "undeliverable," helping users assess whether to proceed with communication.
No, each request to the API is designed to check one domain or email address at a time. Users must send separate requests for each domain or email they wish to verify.
The domain registration information includes the registrar name, creation date, expiration date, and the age of the domain in days. This data helps assess the legitimacy and stability of the domain.
The "grade" field categorizes the domain's health based on its score. Grades such as "high," "medium," or "low" provide a quick visual cue for users to gauge the domain's trustworthiness and email deliverability.
The API can analyze any domain, including those associated with popular email providers like Google Workspace and Microsoft 365, as well as self-hosted servers. It also identifies disposable and catch-all domains.
If a domain has missing or incomplete data, the API will still return available information, but the score may reflect potential risks. Users should interpret lower scores as indicators of possible issues with the domain's configuration or legitimacy.
To obtain your API key, first sign in to your account and navigate to the API you want to use. From the API's Pricing section, choose a plan and complete the subscription process. Once subscribed, return to the API page and you will see your API Access Key displayed at the top of the documentation page. You can use this key to authenticate your requests.
You can’t switch APIs during the free trial. If you subscribe to a different API, your trial will end and the new subscription will start as a paid plan.
The free trial lasts for 7 days and allows you to make up to 50 API requests.
No, the free trial is available only once, so we recommend using it on the API that interests you the most. Most of our APIs offer a free trial, but some may not include this option.
Yes. If the API offers a free trial, you will see a "Free 7-Day Trial" option in its Pricing section. The trial lasts for 7 days and allows up to 50 API requests, enabling you to evaluate the API before subscribing to a paid plan.
Zyla API Hub is like a big store for APIs, where you can find thousands of them all in one place. We also offer dedicated support and real-time monitoring of all APIs. Once you sign up, you can pick and choose which APIs you want to use. Just remember, each API needs its own subscription. But if you subscribe to multiple ones, you'll use the same key for all of them, making things easier for you.
You can monitor your API usage through the response headers included with every request:
x-zyla-api-calls-monthly-used: Shows the total number of API requests you have used during the current billing period.
x-zyla-api-calls-monthly-remaining: Shows the number of API requests you have remaining for the current billing period.
Yes, you can cancel your subscription at any time. Simply go to the Pricing section of the API you're subscribed to and click the "Unsubscribe" button.
Please note that upgrades, downgrades, and cancellations take effect immediately. Once your subscription is canceled, access to the service will end immediately, regardless of any remaining API calls in your quota.
Please have a look at our Refund Policy: https://zylalabs.com/terms#refund