---
title: "Domains linking to competitors but not you"
method: POST
path: "/v1/data/seo/backlink-gap"
tags: ["SEO: Backlinks", "SEO: Competitors"]
---

# Domains linking to competitors but not you

`POST /v1/data/seo/backlink-gap`

## Request

- Base URL: `https://api.superagnt.com`
- URL: `https://api.superagnt.com/v1/data/seo/backlink-gap`
- Auth: API key in header `Authorization`

Finds domains that link to one or more competitor targets but NOT to the excluded target (you). The output is a ready-made link-building prospect list; chain it with an email-finder tool to turn rows into outreach. Response shape: each row's referring domain lives at items[].domain_intersection["1"], ["2"], ... keyed by the 1-based index of your `targets` array, with that referring domain's own authority score in `rank` (0-1000ish, higher is stronger; this is the referring domain's rank, a different metric from the target-domain rank in backlinks_summary). Default sort is rank descending. When ranking prospects, check referring_domains and backlinks together — a huge backlink count with few referring domains usually means sitewide boilerplate links, not authority.

## Request body

- object
  - `targets` string[], required: Competitor domains whose backlink sources to intersect (1-20).
  - `exclude_targets` string[]: Domains the referring sites must NOT already link to. Put your own domain here.
  - `limit` integer: Max referring domains to return. Default 100.
  - `offset` integer: Pagination offset.
  - `filters` unknown[]: Optional filter expression, e.g. minimum domain rank.
    - unknown
  - `order_by` string[]: Sort rules, e.g. ["1.rank,desc"].

## Response `200`

Referring domains that link to the targets, in `result[0].items`.

- object

## Other responses

- `400`: Bad request or upstream task error.
- `401`: Unauthorized.
- `429`: Too many requests.
- `5XX`: Upstream error.

---

[API](https://skmtc.dev/superagnt/apis/superagnt-api.md) · [All operations](https://skmtc.dev/superagnt/apis/superagnt-api/llms.txt) · [OpenAPI document](https://skmtc.dev/superagnt/apis/superagnt-api/revisions/b2d8de30ccf0?raw)