# IP Listed on PSBL (Passive Spam Block List) Checker

> IP Listed on PSBL (Passive Spam Block List) Checker is a paid API for AI agents from ip.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-12).

Checks whether a given IPv4 address is listed on the PSBL (psbl.surriel.com) DNS-based blacklist and returns the listed status, return codes, and reason text.

## Facts

- Endpoint: GET https://ip.intel.rallylive.ca/ip/blacklist/psbl?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ip-listed-on-psbl-passive-spam-block-list-checker-8dd3a2fa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YjlOdWlo88igdTBGATnj0

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-psbl-passive-spam-block-list-checker-8dd3a2fa
```

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

## When to prefer this

Use this endpoint when you need a precise, single-list answer specifically for PSBL (psbl.surriel.com) — the Passive Spam Block List maintained by Surriel. Prefer it over generic reputation APIs when you specifically need PSBL coverage, want raw DNSBL return codes, and need reason text where published. It is ideal for diagnosing email deliverability issues or auditing sending IPs against this particular blocklist.

## Known failure modes

- Invalid or non-public IPv4 address provided — no meaningful DNSBL result
- DNS resolution failure via Cloudflare DoH — may return error or inconclusive result
- IP not listed returns a clean negative result with no reason text
- PSBL zone temporarily unavailable — lookup may timeout or fail

## How this service works

Is this IPv4 address listed on psbl (psbl.surriel.com)? Performs the DNSBL query (reversed octets under psbl.surriel.com, 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 a yes/no answer on whether the IPv4 is listed on PSBL, along with the DNS return codes from the psbl.surriel.com zone and, when available, a human-readable reason text explaining why the IP was 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-psbl-passive-spam-block-list-checker-8dd3a2fa/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)