# is-port-143-open

> is-port-143-open is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Checks whether TCP port 143 (IMAP) is open, closed, or filtered on a given host by attempting a connection from Cloudflare's edge network.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/port/143?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/is-port-143-open-70b8c707
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_B71oXCDVnBQSTeFsVje2v

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 is-port-143-open-70b8c707
```

Example prompt: Can you check whether TCP port 143 (IMAP) is open or closed on mail.example.com — I want to know if the IMAP service is reachable from the outside without running a port scanner.

## When to prefer this

Use this endpoint when you need a quick, passive check of IMAP port 143 reachability on a host without deploying a local port scanner or network tool. It is ideal for security audits, pre-deployment checks, or validating mail server configuration from an external vantage point. Prefer it over general-purpose port checkers when you specifically need IMAP exposure results via Cloudflare's edge with built-in Cloudflare-fronting detection.

## Known failure modes

- Host is Cloudflare-fronted: result reported as inconclusive because Cloudflare's edge intercepts the connection
- Invalid hostname or IP: request may fail or return an error
- Timeout/filtered: port appears closed or filtered if a firewall drops packets silently
- Network unreachable target: connection attempt times out with no result
- Payment failure: $0.01 USDC x402 payment required; missing or invalid payment returns 402 error

## How this service works

Is TCP port 143 (IMAP) open on a host? Attempts a connection from Cloudflare's edge and reports open/closed/filtered with the connect time; Cloudflare-fronted hosts are reported as inconclusive because their edge answers for them. Exposure checks for IMAP without running a scanner. $0.01 per check.

## Output

Returns whether TCP port 143 is open, closed, or filtered on the target host, along with the connection time in milliseconds. If the host is fronted by Cloudflare's edge network, the result is reported as inconclusive since Cloudflare answers on behalf of the origin.

## 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/is-port-143-open-70b8c707/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ip.intel.rallylive.ca](https://www.zero.xyz/host/ip.intel.rallylive.ca/llms.txt)