# Seonio, free: Backlink API

> The strongest backlinks to a domain or URL, one per referring domain.

Seonio's backlink API on its Free $1 plan. It costs $0.00 per 1,000 backlinks. Seonio's docs list all 5 key fields we check: Source URL, Anchor text, Follow or nofollow, Authority, First and last seen.
We haven't run Seonio through [our backlink API benchmark](https://datacircle.dev/best-backlink-api.txt) yet.
This plan is free. We rank 105 plans for backlink APIs by price. Half the plans cost $0.225 per 1,000 backlinks or less.
[Keys.so's ₽34,900 monthly plan](https://datacircle.dev/backlink-apis/keys-so/34900-monthly/llms.txt) costs the least per 1,000 backlinks. Keys.so's ₽34,900 monthly plan charges nothing per call. You get as many backlinks as Keys.so's rate limit allows.
[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 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/seonio/free
- [Backlink API: the 5 best providers compared](https://datacircle.dev/best-backlink-api.txt)
- Get it: https://seonio.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- Request: `POST https://seonio.com/api/v1/backlink/table`
- API key: with the plan, on https://seonio.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- Its API docs: https://seonio.com/product/api/backlink/table?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- Sold by: Seonio (https://seonio.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing)
- Checked: 2026-11-06

## In the answer

- Completeness: 100%
- Source URL: ✓
- Anchor text: ✓
- Follow or nofollow: ✓
- Authority: ✓
- First and last seen: ✓

## Price

- $ per 1,000 backlinks: $0.00
- Per: page of 100
- Billing: free

## Charges

- Also pays for: from the same budget: Keyword Research · Keyword Difficulty · Keyword Intent · Keyword Demographics · Keyword Clustering · Keyword Suggestions · Keyword Metrics by Country · SERP · SERP Scraper · Scraper · Website Traffic · Website Ranking · Website Category · Website Competitors · Similar Websites · URL Stats · URL Keywords · Website Stats · Backlink History · AI Visibility Report · AI Visibility Result · Site Audit · Site Audit Result · Seonio SEO Agent · SEO Page Checker

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: The strongest backlinks to a domain or URL, one per referring domain.

## Data

- Keep data: no limit
- Use data: [...] you may use reports, API responses, and outputs generated through your account for: your internal business purposes, your own websites, products, applications, and projects, client work performed by you or your organization, integrations that use Seonio data as part of a broader product or workflow, provided that you comply with these Terms and applicable law [...] You must not: resell standalone access to Seonio, resell or sublicense API access, API keys, or your account, resell raw datasets, raw API responses, or raw outputs as a separate data product, use the Service or outputs to build a substantially similar competing service without our written permission, misrepresent Seonio outputs as official, guaranteed, real-time, or independently verified data, remove or obscure any usage restrictions, source notices, or attribution requirements that may be shown in the Service

## Plan

- Pay: $0
- You get: $1
- Enough for: 50 pages, once
- Expires: 30 days after the account is verified

## Rate limit

- Per second: 5
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: target. Optional: limit
- Method: POST
- Path: /api/v1/backlink/table

## About the plan

- Plan: Free $1
- Who can get it: anyone with a verified account

## The 19 fields the plan's answer can hold

target, source URL, source domain, target URL, target domain, anchor text, link type, row type, dofollow, backlink rank, source page rank, source domain rank, backlink spam score, first seen, last seen, is new, is lost, created at, updated at

## Seonio's plans (10)

- [Seonio, free](https://datacircle.dev/backlink-apis/seonio/free/llms.txt): $0.00 per 1,000, 100% complete
- [Seonio, $10 pack](https://datacircle.dev/backlink-apis/seonio/10-pack/llms.txt): 100% complete
- [Seonio, $100 pack](https://datacircle.dev/backlink-apis/seonio/100-pack/llms.txt): $0.174 per 1,000, 100% complete
- [Seonio, $1,000 pack](https://datacircle.dev/backlink-apis/seonio/1000-pack/llms.txt): 100% complete
- [Seonio, $15 monthly](https://datacircle.dev/backlink-apis/seonio/15-monthly/llms.txt): $0.20 per 1,000, 100% complete
- [Seonio, $30 monthly](https://datacircle.dev/backlink-apis/seonio/30-monthly/llms.txt): $0.16 per 1,000, 100% complete
- [Seonio, $60 monthly](https://datacircle.dev/backlink-apis/seonio/60-monthly/llms.txt): $0.133 per 1,000, 100% complete
- [Seonio, $120 yearly](https://datacircle.dev/backlink-apis/seonio/120-yearly/llms.txt): $0.133 per 1,000, 100% complete
- [Seonio, $240 yearly](https://datacircle.dev/backlink-apis/seonio/240-yearly/llms.txt): $0.107 per 1,000, 100% complete
- [Seonio, $480 yearly](https://datacircle.dev/backlink-apis/seonio/480-yearly/llms.txt): $0.089 per 1,000, 100% complete

## Seonio's calls for this API (1)

- `POST /api/v1/backlink/table`: [Seonio, free](https://datacircle.dev/backlink-apis/seonio/free/llms.txt)

## Seonio's APIs (8)

- [Seonio: related keywords API pricing, 10 plans](https://datacircle.dev/related-keywords-apis/seonio/free/llms.txt)
- [Seonio: backlink API pricing, 10 plans](https://datacircle.dev/backlink-apis/seonio/free/llms.txt)
- [Seonio: web scraping API pricing, 10 plans](https://datacircle.dev/web-scraping-apis/seonio/free/llms.txt)
- [Seonio: keyword research API pricing, 10 plans, POST /api/v1/keywords/country](https://datacircle.dev/keyword-research-apis/seonio/free-1-post-api-v1-keywords-country/llms.txt)
- [Seonio: keyword research API pricing, 10 plans, POST /api/v1/keywords/global](https://datacircle.dev/keyword-research-apis/seonio/free-1-post-api-v1-keywords-global/llms.txt)
- [Seonio: SERP API pricing, 10 plans, POST /api/v1/serp/country](https://datacircle.dev/serp-apis/seonio/free-1-post-api-v1-serp-country/llms.txt)
- [Seonio: SERP API pricing, 10 plans, POST /api/v1/serp/scraper](https://datacircle.dev/serp-apis/seonio/free-1-post-api-v1-serp-scraper/llms.txt)
- [Seonio: similar companies API pricing, 10 plans, POST /api/v1/website/similar](https://datacircle.dev/similar-company-apis/seonio/free-1-post-api-v1-website-similar/llms.txt)
- [Seonio: similar companies API pricing, 10 plans, POST /api/v1/website/competitors](https://datacircle.dev/similar-company-apis/seonio/free-1-post-api-v1-website-competitors/llms.txt)
- [Seonio: ranked keywords API pricing, 10 plans, POST /api/v1/url/keywords](https://datacircle.dev/ranked-keywords-apis/seonio/free-1-post-api-v1-url-keywords/llms.txt)
- [Seonio: ranked keywords API pricing, 10 plans, POST /api/v1/website/ranking](https://datacircle.dev/ranked-keywords-apis/seonio/free-1-post-api-v1-website-ranking/llms.txt)
- [Seonio: domain authority API pricing, 10 plans, POST /api/v1/url/stats](https://datacircle.dev/domain-authority-apis/seonio/free-1-post-api-v1-url-stats/llms.txt)
- [Seonio: domain authority API pricing, 10 plans, POST /api/v1/website/stats](https://datacircle.dev/domain-authority-apis/seonio/free-1-post-api-v1-website-stats/llms.txt)

## Seonio: backlink API alternatives

- [AnyAPI, top-up from $10, Manual top-up, POST /v1/run/seo.backlinks](https://datacircle.dev/backlink-apis/anyapi/top-up-from-10-manual-top-up-post-v1-run-seo-backlinks/llms.txt): $0.05 per 1,000, 100% complete
- [Aizhan, top-up](https://datacircle.dev/backlink-apis/aizhan/top-up/llms.txt): $0.075 per 1,000, 40% complete
- [RankParse, $59 monthly, Agency (monthly), POST /v1/batch](https://datacircle.dev/backlink-apis/rankparse/59-monthly-agency-monthly-post-v1-batch/llms.txt): $0.079 per 1,000, 80% complete, 3 months
- [YepAPI, top-up](https://datacircle.dev/backlink-apis/yepapi/top-up/llms.txt): $0.10 per 1,000, 100% 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 2026-11-06.

- https://seonio.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- https://seonio.com/product/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- https://seonio.com/product/api/backlink/table?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing
- https://seonio.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=backlink-api-pricing