# Karma.Domains Backlink Checker for Expired Domains

> Karma.Domains Backlink Checker for Expired Domains is a paid API for AI agents from api.karma.domains, paid per call via x402, $1.5/call, status unknown (last checked 2026-10-16).

Returns backlink data for a given domain name, sourced from a database of 13M+ expired domains with SEO metrics

## Facts

- Endpoint: GET https://api.karma.domains/v1/domains/checker/backlinks?utm_source=zero.xyz
- Price: $1.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/karma-domains-backlink-checker-for-expired-domains-a4d5a426
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_dPpEsm8X_ZT5Xb6WSpCnr

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 karma-domains-backlink-checker-for-expired-domains-a4d5a426
```

Example prompt: Can you check the backlink profile for oldnewspaper.com using Karma.Domains to see if it has strong SEO backlinks worth buying?

## When to prefer this

Use this endpoint when you need to evaluate the SEO backlink profile of a specific expired, dropped, or auctioned domain before purchasing it. It is ideal for SEO professionals, domain investors, and PBN builders who need quick per-domain backlink data without subscribing to full SEO suites like Ahrefs or Moz.

## Known failure modes

- Missing 'domain' query parameter returns a validation error
- Invalid or malformed domain string may return empty backlinks array
- Domain not found in the 13M+ database returns empty backlinks
- Network timeout or upstream API unavailability
- Payment failure (HTTP 402) if x402 payment is not completed before request

## How this service works

Find expired domain names with high traffic and strong SEO backlinks daily. Boost your revenue by searching our database of 13,000,000+ expired domains from auctions, backorders, and dropped lists—complete with rich metrics and domain age.

## Output

A JSON object containing the queried domain name and an array of backlinks associated with it, sourced from Karma.Domains' database of expired domain SEO metrics. The backlinks array may include referring domains, anchor texts, and link quality signals depending on availability.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "example": "example.com"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "example.com",
  "backlinks": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/karma-domains-backlink-checker-for-expired-domains-a4d5a426/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.karma.domains](https://www.zero.xyz/host/api.karma.domains/llms.txt)