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catch-all-hint
x402
catch-all-hint is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Estimates whether a domain accepts mail to any address (catch-all behavior) using provider heuristics, wildcard DNS, and MX shape — no SMTP probing required.
Price / call$0.01
Success—
StatusUnknown
How this service works
Catch-all mailbox hint (no SMTP probing): estimates whether a domain accepts mail to any address, from provider defaults (Google Workspace/Microsoft 365 usually reject unknown users; many small hosts and Cloudflare Email Routing accept all), wildcard DNS and MX shape. Helps interpret 'deliverable: likely' results. $0.01 per domain.
Output
Returns a structured estimate of whether the queried domain behaves as a catch-all mail host, based on known provider defaults (e.g. Google Workspace and Microsoft 365 typically reject unknown users; Cloudflare Email Routing and many small hosts accept all), wildcard DNS presence, and MX record shape. Helps contextualize 'deliverable: likely' results from email verification tools without performing live SMTP probing.
Example use cases
Interpreting ambiguous email verification
“I just verified a list of email addresses and several came back as 'deliverable: likely' — can you check whether the domains like freshstartco.io and brightsidehealth.com are catch-all so I know if those results are trustworthy?”
Email campaign lead qualification
“Before we send our outreach campaign to leads from smallbiznetwork.org, can you check if that domain is catch-all? I want to know if bounce rates will be reliable or if they accept mail to anything.”
Detecting Cloudflare Email Routing domains
“I'm trying to figure out if newsletter@cloudpivot.dev is a real inbox or just a catch-all forwarding setup — can you check if that domain accepts mail to any address?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/email/catch-all-hintWhen to prefer
Choose this endpoint when you need to assess catch-all status without triggering SMTP probes (which can be rate-limited, flagged, or blocked). It is particularly useful when interpreting results from email verification tools that return 'deliverable: likely' ambiguity, or when you want a fast, low-cost signal about whether a domain uses a major provider (Google Workspace, Microsoft 365) versus a permissive catch-all host (Cloudflare Email Routing, small shared hosts).
Side effects
- Unknown or unresolvable domain may return low-confidence estimate
- Domain uses atypical MX configuration not covered by provider heuristics
- New or recently migrated domains may have stale DNS that produces incorrect inference
- No SMTP probing means the result is an estimate, not a confirmation — false positives possible for unusual hosting setups
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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