# Services from api.probekit.dev on Zero

> api.probekit.dev serves 14 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/api.probekit.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.probekit.dev/health.json

## Services

- [ProbeKit SPF Record Analyzer](https://www.zero.xyz/c/probekit-spf-record-analyzer-b39c56a3/llms.txt): $0.01/call via x402. Parses and evaluates a domain's SPF record, expanding include/redirect trees, checking qualifiers, and verifying compliance with RFC 7208's 10 DNS lookup limit.
- [ProbeKit Domain Health Report](https://www.zero.xyz/c/probekit-domain-health-report-3f3bacc1/llms.txt): $0.08/call via x402. Runs a comprehensive email and DNS security audit on a domain, returning MX, SPF, DMARC, DKIM, MTA-STS, TLS-RPT, DNSSEC, rDNS, BIMI, and CAA findings in a single call.
- [ProbeKit DNS Lookup](https://www.zero.xyz/c/probekit-dns-lookup-2240d163/llms.txt): $0.005/call via x402. Resolves one or more DNS record types (A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, SRV) for a given domain name via public resolvers, returning records with TTL, observation time, and the resolver used.
- [ProbeKit Mail PTR / FCrDNS Check](https://www.zero.xyz/c/probekit-mail-ptr-fcrdns-check-bd3356ed/llms.txt): $0.01/call via x402. Checks reverse DNS (PTR records) for a domain's MX hosts and validates forward-confirmed reverse DNS (FCrDNS), flagging mismatches that cause mail rejection or spam filtering.
- [ProbeKit DKIM Public Key Validator](https://www.zero.xyz/c/probekit-dkim-public-key-validator-8b7b68b0/llms.txt): $0.01/call via x402. Fetches and validates the DKIM public key DNS record for a given domain and selector, checking key type, size, revocation status, and syntax.
- [ProbeKit CAA DNS Lookup](https://www.zero.xyz/c/probekit-caa-dns-lookup-0fa0a9dc/llms.txt): $0.01/call via x402. Evaluates a domain's CAA records (including parent-name climbing) to determine which CAs are authorized to issue certificates, detect iodef reporting addresses, unknown critical tags, and invalid values.
- [ProbeKit Mail Authentication Check](https://www.zero.xyz/c/probekit-mail-authentication-check-ac7f3977/llms.txt): $0.03/call via x402. Returns a single consolidated report of a domain's email authentication setup — MX, SPF, DMARC, and optional DKIM selectors — with coded findings and an overall status.
- [ProbeKit MX Record Lookup](https://www.zero.xyz/c/probekit-mx-record-lookup-cd157229/llms.txt): $0.01/call via x402. Lists a domain's mail servers in preference order and detects null MX (RFC 7505) and unresolvable MX targets with coded findings.
- [ProbeKit MTA-STS Check](https://www.zero.xyz/c/probekit-mta-sts-check-1217a314/llms.txt): $0.02/call via x402. Validates a domain's MTA-STS policy (RFC 8461) and TLS-RPT record (RFC 8460), including DNS record presence, HTTPS policy file retrieval, certificate validity, mode, max_age, and MX host coverage.
- [ProbeKit DMARC Lookup](https://www.zero.xyz/c/probekit-dmarc-lookup-972b0a63/llms.txt): $0.01/call via x402. Looks up and explains a domain's DMARC record, including policy, subdomain policy, alignment mode, and reporting addresses, with coded findings indicating spoofing protection status.
- [ProbeKit Bulk Mail Configuration Check](https://www.zero.xyz/c/probekit-bulk-mail-configuration-check-10cf7443/llms.txt): $0.03/call via x402. Checks MX, SPF, and DMARC records for up to 20 domains in a single request, returning results in input order with retry tokens for failures.
- [ProbeKit BIMI Record Checker](https://www.zero.xyz/c/probekit-bimi-record-checker-c0213001/llms.txt): $0.01/call via x402. Checks a domain's BIMI DNS record for valid syntax, logo/certificate URLs, DMARC enforcement status, and SVG logo path to diagnose why brand logos don't appear in mail clients.
- [ProbeKit DNSSEC Status Check](https://www.zero.xyz/c/probekit-dnssec-status-check-aee2206f/llms.txt): $0.01/call via x402. Validates a domain's DNSSEC chain of trust and reports its status (secure, insecure, bogus, or unknown) along with DS/DNSKEY algorithms, deprecated algorithms, and broken key details.
- [ProbeKit DKIM Selector Discovery](https://www.zero.xyz/c/probekit-dkim-selector-discovery-c49283c7/llms.txt): $0.02/call via x402. Tries 27 common DKIM selectors for a domain and validates every key found, including type, size, revocation status, and testing flag

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)