Check SSL Certificates Instantly

SSL Checker API.

Check SSL/TLS certificates for any domain. Returns certificate details, expiration dates, issuer information, and validation status.

Get your free API key Read the docs

Free tier, no card< 200ms responses99.9% uptime SLA

GET/v1/sslcheckerlive

query

Response200 OK · sample

{
  "status": "ok",
  "error": null,
  "data": {
    "subject": {
      "C": "US",
      "ST": "California",
      "O": "eBay, Inc.",
      "CN": "ebay.com"
    },
    "issuer": {
      "C": "GB",
      "O": "Sectigo Limited",
      "CN": "Sectigo Public Server Authentication CA OV R36"
    },
    "subjectaltname": "DNS:ebay.com, DNS:befr.ebay.be, DNS:benl.ebay.be, DNS:cafr.ebay.ca, DNS:e-bay.it, DNS:ebay.at, DNS:ebay.be, DNS:ebay.ca, DNS:ebay.ch, DNS:ebay.co.uk, DNS:ebay.com.au, DNS:ebay.com.hk, DNS:ebay.com.my, DNS:ebay.com.sg, DNS:ebay.de, DNS:ebay.es, DNS:ebay.fr, DNS:ebay.ie, DNS:ebay.in, DNS:ebay.it, DNS:ebay.nl, DNS:ebay.ph, DNS:ebay.pl, DNS:ebay.us, DNS:ebay.vn, DNS:wwww.ebay.co.uk, DNS:wwww.ebay.com, DNS:wwww.ebay.com.au, DNS:wwww.ebay.de, DNS:wwww.ebay.in, DNS:wwww.ebay.it",
    "infoAccess": {
      "CA Issuers - URI": [
        "http://crt.sectigo.com/SectigoPublicServerAuthenticationCAOVR36.crt"
      ],
      "OCSP - URI": [
        "http://ocsp.sectigo.com"
      ]
    },
    "ca": false,
    "bits": 2048,
    "valid_from": "Jul 28 00:00:00 2025 GMT",
    "valid_to": "Jul 28 23:59:59 2026 GMT",
    "serialNumber": "99F408949A6416EDC3B8F5EC77B2EBE5",
    "domain": "ebay.com",
    "isExpired": false,
    "isValid": true,
    "daysUntilExpiry": 20,
    "isExpiringSoon": true,
    "isSelfSigned": false
  }
}

Sample response · verify to run one live call, no signup

How it works

SSL Checker API

Check SSL/TLS certificates for any domain. Returns certificate details, expiration dates, issuer information, and validation status.

Full certificate chain validation
Expiration date and days remaining
TLS protocol version detection
Issuer and subject information

1
Send one request
A single authenticated GET with the location you care about — no SDK required.
```
GET /v1/sslchecker?query=…
x-api-key: your_key
```
2
We do the aggregation
Each request pulls from multiple upstream sources and computes the derived fields for you.
3
Get clean JSON back
One structured object, typically under 200 ms — ready to render.
```
{ subject, issuer, subjectaltname, … }
```

The response

Everything in a single call.

/v1/sslcheckerapplication/json

subjectC, ST, O, CN

issuerC, O, CN

subjectaltname"DNS:ebay.com, DNS:befr.ebay.be, DNS:benl.ebay.be, DNS:caf…"

infoAccessCA Issuers - URI, OCSP - URI

cafalse

bits2048

valid_from"Jul 28 00:00:00 2025 GMT"

valid_to"Jul 28 23:59:59 2026 GMT"

serialNumber"99F408949A6416EDC3B8F5EC77B2EBE5"

domain"ebay.com"

isExpiredfalse

isValidtrue

daysUntilExpiry20

isExpiringSoontrue

isSelfSignedfalse

Start coding

Call it in your language.

Copy a working request, or install a typed SDK. Same endpoint, same key.

const res = await fetch("https://api.apiverve.com/v1/sslchecker?domain=ebay.com", {
  headers: { "x-api-key": "YOUR_API_KEY" },
});
const { data } = await res.json();
console.log(data);

Included in your key

One subscription, the whole check ssl certificates instantly stack.

Every related API ships with your key — no separate plans, no extra keys, one bill.

See pricing

8APIs in this bundle

99.9%uptime SLA

The bundle

sslcheckerYou’re heretlscheck domainexpiration dnslookup whoislookup pinger spfvalidator mxlookup

No code required

Wire it into the tools you already run.

Ready-made recipes for Zapier, Make, and n8n — trigger on an event, and the data lands where your team works.

Google Sheets

Check SSL certificates for domain list

WhenNew row added

ThenCheck SSL → update row with results

Slack

Alert on expiring SSL certificates

WhenScheduled daily

ThenCheck SSL → alert if valid_to is approaching

Airtable

Check SSL for new domain records

WhenNew record created

ThenCheck SSL → populate certificate fields

Notion

Add SSL certificate data to domain entries

WhenNew database item created

ThenCheck SSL → update properties

Salesforce

Check SSL for new account domains

WhenNew account created

ThenCheck SSL → update custom field

GitHub

Check SSL in CI pipeline

WhenNew push to repository

ThenCheck SSL → fail build if certificate is expiring

Browse all integrations

Questions about the API

What does the SSL checker validate?

We validate the certificate chain, check expiration dates, verify the domain matches, and detect the TLS protocol version.

How many days notice before expiration?

The API returns daysRemaining so you can set your own thresholds. Common practice is to renew 30 days before expiration.

Does it check for vulnerabilities?

We check protocol versions (TLS 1.2+) and basic configuration. For deep vulnerability scanning, use dedicated security tools.

What if the certificate is self-signed?

Self-signed certificates will show as invalid since they're not trusted by public CAs. The details are still returned.

Can I check internal domains?

The API checks publicly accessible domains. Internal/private domains behind firewalls are not reachable.

Does it check all certificate types?

We support standard SSL/TLS certificates including DV, OV, and EV certificates from public certificate authorities.

SSL Checker API.

SSL Checker API

Send one request

We do the aggregation

Get clean JSON back

Everything in a single call.

What developers build with it.

Certificate Expiration Monitoring

Security Dashboard Integration

Call it in your language.

One subscription, the whole check ssl certificates instantly stack.

Wire it into the tools you already run.

Understand the data behind the API.

Understanding SSL/TLS Certificates

TLS Protocol Versions Explained

Understanding Certificate Chains

Questions about the API

Start building with the SSL Checker API. Free tier, no card required — your key is live in minutes.

Bonus: 300+ more APIs