{"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/13107/fast+email+deliverability+verification+and+domain+health+api/26562/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/13107/fast+email+deliverability+verification+and+domain+health+api/26563/[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 Fast 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.
(Save 2 months with annual billing 🎉)
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 a comprehensive assessment of a domain's email deliverability, health score, email provider details, and DNS records. The "Verify Email Address" endpoint provides the deliverability status of an email address, including risk level, deliverability score, and various checks like syntax and MX records.
Key fields in the "Domain Deliverability and Health Check" response include "domain," "score," "email," "registration," and "infra." For the "Verify Email Address" endpoint, important fields are "email," "status," "deliverable," and "score," along with detailed checks.
The response data is structured in JSON format. For the domain check, it includes nested objects for email, registration, and infrastructure details. The email verification response contains fields for status and checks, allowing users to easily parse and utilize the information.
The "Domain Deliverability and Health Check" provides insights on email provider, SPF/DMARC configurations, MX records, domain age, and overall health score. The "Verify Email Address" endpoint offers deliverability status, risk assessment, and checks for syntax, disposable status, and SMTP validation.
Data accuracy is maintained through continuous monitoring of DNS records, email authentication settings, and domain configurations. The API aggregates information from reliable sources and performs regular updates to ensure the data reflects the current state of the domains and email addresses.
Typical use cases include validating domains before email campaigns, qualifying leads in CRM systems, blocking disposable signups in real-time, and conducting security audits on email configurations. This helps improve deliverability rates and reduces the risk of sending to untrustworthy domains.
Users can customize requests by specifying the domain or email address they want to check. The API accepts these as parameters in the GET request, allowing users to focus on specific domains or email addresses relevant to their needs.
Users can expect a score ranging from 0 to 100, with scores above 70 indicating healthy domains. The response will typically include detailed checks for email deliverability, domain health, and potential risks, allowing users to make informed decisions based on the provided data.
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