# citable.run Backlinks

> citable.run Backlinks is a paid API for AI agents from citable.run, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-10).

Returns total backlink count and top referring domains for a given hostname.

## Facts

- Endpoint: GET https://citable.run/v1/backlinks?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/citable-run-backlinks-9c118461
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_duJAcvl2lWvs1qaphWuC7

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 citable-run-backlinks-9c118461
```

Example prompt: How many backlinks does ahrefs.com have and which are the top 15 referring domains linking to it?

## When to prefer this

Use this endpoint when you need a quick backlink count and referring domain overview for a specific hostname, especially when building competitor analyses, vetting partnership domains, or generating SEO reports. It is ideal for lightweight, per-domain lookups rather than bulk crawls or keyword-level link analysis.

## Known failure modes

- Missing required 'domain' query parameter returns a validation error
- Invalid or non-existent domain may return zero results or an error
- 'limit' out of range (outside 1–25) may cause a bad request error
- Payment not fulfilled (x402 protocol) results in a 402 response before data is returned
- Rate limiting may occur under high call volume

## How this service works

Backlink totals and top referring domains for a domain.

## Output

Returns the total number of backlinks pointing to the queried domain along with a ranked list of up to 25 referring domains, including domain names and link counts per referrer.

## 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",
     "required": [
      "domain"
     ],
     "properties": {
      "limit": {
       "type": "string",
       "description": "referring domains to return, 1–25 (default 10)"
      },
      "domain": {
       "type": "string",
       "description": "hostname to profile, e.g. example.com"
      }
     }
    }
   },
   "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/citable-run-backlinks-9c118461/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from citable.run](https://www.zero.xyz/host/citable.run/llms.txt)