# x402-gateway: Backlinks Overview

> x402-gateway: Backlinks Overview is a paid API for AI agents from x402.freeq.one, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-17).

Returns a backlink overview for any domain, including referring domains, total backlink count, and domain authority — pay-per-call in USDC on Base.

## Facts

- Endpoint: POST https://x402.freeq.one/tools/backlinks_overview?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-gateway-backlinks-overview-eb120143
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LJE446v7JEoH7W80y4T8y

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 x402-gateway-backlinks-overview-eb120143 -d '<json body>'
```

Example prompt: Can you pull the backlink overview for shopify.com — I need to see the referring domain count, total backlinks, and authority score for the US market?

## When to prefer this

Choose this endpoint when you need a quick, low-cost backlink overview for any domain without signing up for a full SEO platform subscription. It is ideal for one-off checks, competitive research, or agent workflows that need domain authority signals on demand, billed per call in USDC with no monthly commitment.

## Known failure modes

- Invalid or malformed domain input returns an error
- Unsupported language_code or location_code may return empty or default results
- Payment failure on Base network results in a 402 response and no data returned
- Domain with no indexed backlinks may return zero counts
- Transient upstream SEO data provider outages may return partial or empty results

## How this service works

Backlinks Overview: Backlink overview for any domain — referring domains, backlink count, authority. Priced below typical SEO-data APIs. Pay per call in USDC on Base via x402 — POST https://x402.freeq.one/tools/backlinks_overview.

## Output

A JSON object containing a backlink overview for the requested domain, including metrics such as referring domain count, total backlink count, and domain authority score, scoped to the specified language and Google location.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "domain": {
   "type": "string",
   "example": "example.com",
   "description": "Domain, e.g. example.com (no path)"
  },
  "language_code": {
   "type": "string",
   "description": "Language code (default 'en')"
  },
  "location_code": {
   "type": "integer",
   "description": "Google location code (default 2840 = United States)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-gateway-backlinks-overview-eb120143/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.freeq.one](https://www.zero.xyz/host/x402.freeq.one/llms.txt)