{"uid":"cap_levV-j62Piif0A_-lUfHn","slug":"how-is-tls-certificate-inspector-e0c3939a","name":"how.is TLS Certificate Inspector","description":"Certificate validity, issuer, protocol and days until expiry for a domain.","url":"https://how.is/v1/domain/tls?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"domain":{"type":"string","maxLength":253,"description":"A bare domain name, e.g. example.com"}}},"responseSchema":{"type":"json","example":{"data":{"_shape":"data.data: valid, issuer, subject, subjectAltNames, validFrom, validTo, daysUntilExpiry, protocol, cipher, selfSigned."},"result":"TLS certificate for the requested subject","receipt":{"rail":"x402","tool":"tls","charge_usd":0.005,"settlement_tx":"0x…"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_P3-cgUNvb9bCHZvOqL7eD","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns TLS certificate validity, issuer, protocol, cipher, and days until expiry for a given domain.","exampleAgentPrompt":"Can you check the TLS certificate for api.stripe.com — I want to know who issued it, whether it's valid, what protocol it's using, and how many days until it expires?","exampleUseCases":[{"title":"Pre-deployment certificate expiry check","prompt":"Before we push to production, check the TLS certificate on staging.myapp.com — is it still valid, and how many days do we have left before it expires?"},{"title":"Third-party API security audit","prompt":"I'm about to integrate with payments.vendor.io — can you pull their TLS certificate info so I know who issued it, what protocol they're running, and whether it's self-signed?"},{"title":"SSL monitoring alert triage","prompt":"We got an alert that something is off with the cert on secure.example.com — can you look up the certificate details, including validity, issuer, and cipher, so I can figure out what's wrong?"}],"resultDescription":"A JSON object containing: validity status, issuer, subject, subject alt names, validFrom and validTo dates, daysUntilExpiry (integer), TLS protocol version, cipher suite, and whether the certificate is self-signed. Also includes a payment receipt with rail, tool, USD charge, and settlement transaction hash.","failureModes":["Domain does not exist or is unreachable — certificate lookup fails","Domain has no HTTPS listener — no TLS data returned","Invalid domain format supplied — input validation error","Certificate is expired or revoked — returned with validity flag reflecting state","Network timeout reaching the target domain","Rate limiting or payment failure via x402 protocol"],"whenToPreferThis":"Use this endpoint when you need programmatic, structured TLS certificate data for a domain — especially issuer identity, protocol version, cipher, and expiry countdown — rather than a raw openssl command or manual browser check. Ideal for security audits, pre-integration checks, automated monitoring pipelines, and agent workflows that need to reason about certificate trustworthiness before making outbound connections.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:39:19.358Z","isFirstParty":false,"canonicalSlug":"how-is-tls-certificate-inspector-e0c3939a"}