# 12backlinks, contact us: Backlink API

> Launch a competitor link export. PAID: max_credits (from quote_link_gap, approved by the user) is reserved at launch, when the export finishes, it is charged on the non spam referring domains delivered and the rest is refunded (credits_charged, credits_refunded).

12backlinks's Credits plan lets you call the backlink API. We check each provider's docs for 5 fields. 12backlinks's docs list 3: Source URL, Authority, First and last seen.
We haven't run 12backlinks through [our backlink API benchmark](https://datacircle.dev/best-backlink-api.txt) yet.
12backlinks gives this plan's price on request. We rank 123 plans for backlink APIs by price. Half the plans cost $0.242 or less per 1,000 backlinks.
[Keys.so's ₽34,900 (about $417) monthly plan](https://datacircle.dev/backlink-apis/keys-so/34900-monthly/llms.txt) is the cheapest paid plan per 1,000 backlinks. Keys.so's ₽34,900 (about $417) monthly plan charges nothing per call. You get as many backlinks as Keys.so's rate limit allows. [AnyAPI's pay-as-you-go plan](https://datacircle.dev/backlink-apis/anyapi/pay-as-you-go-pay-per-call-with-x402-and-mpp-post-v1-run-seo-backlinks/llms.txt) costs the least for 10,000 backlinks a month: $0.50.
[BacklinkMCP's $19 monthly plan](https://datacircle.dev/backlink-apis/backlinkmcp/19-monthly/llms.txt) covers any number of backlinks. BacklinkMCP's $19 monthly plan costs less up front than Keys.so's ₽34,900 (about $417) monthly plan.
[DataForSEO](https://datacircle.dev/backlink-apis/dataforseo/top-up-from-50/llms.txt), [BacklinkMCP](https://datacircle.dev/backlink-apis/backlinkmcp/19-monthly/llms.txt) and [SE Ranking](https://datacircle.dev/backlink-apis/se-ranking/29-monthly-add-on-monthly-billing-get-v1-backlinks-raw/llms.txt) are the best backlink API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/backlink-apis/12backlinks/contact-us
- [Backlinks API: the 6 best of 50+ SEO data providers compared](https://datacircle.dev/best-backlink-api.txt)
- Get it: https://12backlinks.com/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- Request: `POST https://12backlinks.com/api/v1/link-gaps`
- API key: with the plan, on https://12backlinks.com/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- Its API docs: https://12backlinks.com/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- Sold by: 12backlinks (https://12backlinks.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing)
- Checked: 2026-11-10

## In the answer

- Completeness: 60%
- Source URL: ✓
- Authority: ✓
- First and last seen: ✓

## Price

- Per: result
- Billing: contact

## Charges

- Also pays for: from the same budget: analyze_keywords

## In their words

- Their pitch: Launch a competitor link export. PAID: max_credits (from quote_link_gap, approved by the user) is reserved at launch, when the export finishes, it is charged on the non spam referring domains delivered and the rest is refunded (credits_charged, credits_refunded).

## Data

- Keep data: no API terms
- Use data: no API terms

## Rate limit

- Concurrent: 1
- Batch: 1

## Speed

- Answer: in the call or by polling

## The call

- You send: target, max_credits, one of analysis_id, batch_id or competitors. Optional: competitors[].domain, competitors[].depth, depth, velocity, wait, idempotency_key
- Method: POST
- Path: /api/v1/link-gaps

## About the plan

- Plan: Credits
- Who can get it: anyone

## The 17 fields the plan's answer can hold

result ID, status, target, competitor domain, competitor position, competitor keywords ranked, referring domains, referring domains without spam, referring domains delivered, source domain, source domain rank, source domain spam score, first seen, competitors linking, target has link, total results, amount charged

## 12backlinks's plans (1)

- [12backlinks, contact us](https://datacircle.dev/backlink-apis/12backlinks/contact-us/llms.txt): 60% complete

## 12backlinks's calls for this API (1)

- `POST /api/v1/link-gaps`: [12backlinks, contact us](https://datacircle.dev/backlink-apis/12backlinks/contact-us/llms.txt)

## 12backlinks's APIs (2)

- [12backlinks: backlink API pricing, 1 plan](https://datacircle.dev/backlink-apis/12backlinks/contact-us/llms.txt)
- [12backlinks: keyword research API pricing, 1 plan](https://datacircle.dev/keyword-research-apis/12backlinks/contact-us/llms.txt)

## 12backlinks: backlink API alternatives

- [DomDetailer, contact us](https://datacircle.dev/backlink-apis/domdetailer/contact-us/llms.txt): 60% complete
- [SEObserver, contact us, API subscription, GET /backlinks/top.json](https://datacircle.dev/backlink-apis/seobserver/contact-us-api-subscription-get-backlinks-top-json/llms.txt): 60% complete
- [SEOkicks, contact us, Account, GET /SEOkicksService/V1/inlinkData, Link details](https://datacircle.dev/backlink-apis/seokicks/contact-us-account-get-seokicksservice-v1-inlinkdata-link-details/llms.txt): 60% complete
- [SEORCE, contact us](https://datacircle.dev/backlink-apis/seorce/contact-us/llms.txt): 60% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-10.

- https://12backlinks.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- https://12backlinks.com/api/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- https://12backlinks.com/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- https://12backlinks.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing