# catch-all-hint

> 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.

## Facts

- Endpoint: GET https://intel.rallylive.ca/email/catch-all-hint
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/catch-all-hint-61fb943a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tYC9yehVIdcvoJsvf4oC7

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

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability catch-all-hint-61fb943a
```

Example prompt: Can you check whether the domain acme-corp.io is a catch-all mail host — does it accept email sent to any address, or does it reject unknown users?

## When to prefer this

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).

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "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"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/catch-all-hint-61fb943a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from intel.rallylive.ca](https://www.zero.xyz/host/intel.rallylive.ca/llms.txt)