# IP Listed on Mailspike DNSBL

> IP Listed on Mailspike DNSBL 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 a given IPv4 address is listed on the Mailspike blacklist (bl.mailspike.net) and returns the listing status, return codes, and reason text.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/blacklist/mailspike?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/ip-listed-on-mailspike-dnsbl-b030af05
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_fb-FsrTNT0iZ-lWeOCh6Y

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 ip-listed-on-mailspike-dnsbl-b030af05
```

Example prompt: Can you check if the IP address 203.0.113.42 is listed on the Mailspike blacklist and tell me the return code and reason if it is?

## When to prefer this

Choose this endpoint when you need a precise, single-list answer specifically from Mailspike (bl.mailspike.net), especially when diagnosing email deliverability issues where Mailspike is implicated or when you want the specific return code and reason text that Mailspike publishes. Prefer this over generic multi-DNSBL checkers when you need attribution to exactly this list.

## Known failure modes

- Invalid or non-routable IPv4 address returns an error
- IPv6 addresses are not supported
- DNS resolution failure via Cloudflare DoH may cause lookup timeout
- IP not listed returns a clean/not-listed response (not an error)
- Payment not included or invalid returns HTTP 402

## How this service works

Is this IPv4 address listed on mailspike (bl.mailspike.net)? Performs the DNSBL query (reversed octets under bl.mailspike.net, via Cloudflare DoH) and returns listed yes/no with the return codes and, where the list publishes one, the reason text. One list, one precise answer. $0.01 per lookup.

## Output

Returns whether the queried IPv4 address is listed on bl.mailspike.net (yes/no), the DNSBL return code(s) indicating the listing category or severity, and, where available, the human-readable reason text published by Mailspike explaining why the IP is listed.

## 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/ip-listed-on-mailspike-dnsbl-b030af05/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)