{"uid":"cap_DeslatF0Dj5zt6EvANXaD","slug":"dkim-selector-k3-lookup-3f4c89db","name":"DKIM Selector k3 Lookup","description":"DKIM public key for selector \"k3\" of a domain: looks up k3._domainkey.<domain> (TXT, Cloudflare DoH) and parses v=, k=, key type, public-key length, testing flag and whether the key is revoked (empty p=). Confirms that mail signed with the k3 selector will verify. $0.01 per lookup.","url":"https://dns.intel.rallylive.ca/dns/dkim/k3?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_I1uUvz8JWdG9gtZer7MSk","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up and parses the DKIM public key for the 'k3' selector of a given domain via Cloudflare DoH, returning key type, length, testing flag, and revocation status.","exampleAgentPrompt":"Can you check if the DKIM k3 selector is properly set up for example.com — I want to know the key type, length, whether it's in testing mode, and if the key is revoked?","exampleUseCases":[{"title":"Email deliverability audit for domain","prompt":"Check the DKIM k3 selector for acme.com — I need to know if the public key is valid, what type and length it is, and whether it's been revoked or is just in testing mode."},{"title":"Pre-send DKIM verification check","prompt":"Before we send a bulk campaign from newsletter.mybrand.com using the k3 selector, can you confirm that the k3 DKIM record is properly configured and not revoked?"},{"title":"Security audit of third-party sender","prompt":"We use a third-party ESP that signs with the k3 selector on our domain vendormail.co — can you look up that DKIM key and tell me the key length and whether it's actually active?"}],"resultDescription":"Returns parsed DKIM TXT record fields for k3._domainkey.<domain>: version tag (v=), key type (k=), public key length in bits, whether the key is in testing mode, and whether the key is revoked (empty p= field). Confirms whether mail signed with the k3 selector will successfully verify.","failureModes":["Domain has no k3._domainkey TXT record — returns NXDOMAIN or empty result","DNS query fails due to Cloudflare DoH unavailability","Malformed TXT record that cannot be parsed into DKIM fields","Domain does not exist — DNS resolution fails","Rate limiting or payment failure for $0.01 per-call fee"],"whenToPreferThis":"Use this endpoint when you specifically need to inspect the DKIM 'k3' selector for a domain — for example when auditing email authentication configuration, verifying a third-party sender's signing setup, or troubleshooting DKIM failures tied to the k3 selector. Prefer this over generic DNS TXT lookups when you need structured DKIM field parsing (key type, length, revocation status) rather than raw TXT record text.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-20T00:59:32.153Z","isFirstParty":false,"canonicalSlug":"dkim-selector-k3-lookup-3f4c89db"}