Andrew Grant on July 1, 2026, 10:49 pm

What I Think About The 6 Best Backlink APIs: My Honest Comparison

I have been running white-hat guest post campaigns and gray-hat PBN networks since 2013. I know which data feeds actually help you rank and which just burn through your budget. Choosing the best backlink API depends on whether you are building a custom dashboard for clients or running a script to scrape 50,000 domains for a niche-edit campaign.

Most big names overcharge for “prestige” data while smaller players offer the same 2.7 trillion link index at a fraction of the cost. My article will help you pick the right source based on crawl frequency, index size, and unit costs.

TL;DR: What is the best keyword research API?

In my experience, SE Ranking stands out as the top choice for a keyword research API because it provides programmatic access to search volume, difficulty, and historical SERP data at roughly 35% of the cost of its main competitors. It serves as an excellent SEO backlink API as well, pulling from an index of 2.7 trillion links with 6 billion pages crawled every day to keep things fresh. I honestly prefer it for agency work because you get 100,000 free credits in a trial to test your scripts before spending a cent. When you are looking for the best backlinks API that handles both keywords and links without the “Ahrefs Tax,” this is where you should look. It is also the best backlink API for tracking AI search visibility and brand citations in LLM results.

Technical Comparison of Top Backlink Data Providers

Provider	Index Size (Live Links)	Starting Price (API)	Pricing Model	Best For
SE Ranking	2.7 Trillion	$50/mo (pay-as-you-go)	Credit-based	Agency Reporting
SEMrush	43 Trillion	$499.95/mo	Subscription + Units	Enterprise Scale
DataForSEO	2.8 Trillion	$100/mo min.	Pay-as-you-go	Custom SaaS Tools
Ahrefs	35 Trillion	$1,499/mo	Enterprise Only	High-End Research
Mozscape	45.5 Trillion	$20/mo	Row-based	Authority Metrics
Majestic	232 Billion (Fresh)	$399.99/mo	Analysis Units	Historical Audits

SE Ranking API

I have used the SE Ranking backlink API for several gray-hat projects where we needed to monitor thousands of expiring domains for link injections. Their index of 2.7 trillion links is big enough to catch most referring domains that actually matter for rankings. I think the most important thing for developers is that this is a standalone API product, meaning you don’t necessarily need an active platform subscription to use it. They use one of the web’s most active crawlers to visit 6 billion pages daily. This high frequency of crawling means I see new links appear in their database faster than in some of the older, slower providers.

The backlink checker API for developers here is quite structured. You get access to over 15 metrics, including anchor text, link types, and domain trust scores. I’ve found their Domain Trust and Page Trust metrics to be a reliable proxy for authority, calculated by looking at both the quantity and weight of incoming links. For a project managing high volumes, the bulk backlink analysis API functionality lets you pull data for many targets in a single request, which saves a lot of script execution time. If you are looking for the best backlink API that offers white-label friendly data without a massive markup, this is my usual recommendation.

The pricing is where I find SE Ranking most attractive for mid-sized operations. You can start with a 14-day trial that gives you 100,000 credits to play with. If you move to a paid plan, it’s about $318 per month when billed annually, which gives you 24 million credits a year.

You can also start with a minimum deposit of $50, with credits that don’t expire. Most backlink queries take 1 credit per record, making it very cheap compared to SEMrush’s unit model.

In my gray-hat work, I often need to track if a link has been lost or if the anchor text was changed by a webmaster. The SE Ranking backlink analysis API has specific endpoints for monitoring these changes. I think it’s a “hidden gem” because many people still think of them as just a rank tracker. Honestly, their link data is reliable for everything but the deepest niche prospecting. For those who want to automate technical audits, their API also connects with Looker Studio and tools like n8n. It is a solid choice for anyone needing a consistent backlink API provider.

Pricing of SE Ranking

Core Plan ($129/month or $103.20 billed annually): 10 projects & 1 seat, 2,000 keywords + 100 prompts daily, 5 GEO domains, 250k audit pages/month, 25k API credits with MCP access, rank tracking, unlimited keyword/backlink research, site audit, and integrations (GA, GSC, Looker Studio, Matomo)
Growth Plan ($279/month or $223.20 billed annually): 30 projects & 3 seats, 5,000 keywords + 250 prompts daily, 15 GEO domains, 2M audit pages/month, 100k API credits with MCP access, all Core features plus historical data, collaboration tools, page monitoring, and dedicated support
Agency Pack (+$69/month, annual): add-on with 30 projects, 30 client seats, full white-label platform & reports, unlimited scheduled reports with AI summaries, agency catalog placement, and lead generator
AI Search Add-on ($89/month or $71.20 annually): 200 prompts, tracking across AI platforms (ChatGPT, Perplexity, AI Overviews), unlimited competitor research, SE Visible dashboard, and automated reporting
API Add-on ($149/month, annual): 12M credits, access to backlinks, domain analysis, keyword research, AI search, and website audit APIs for automation
SMM Platform (from $33/month): social media scheduling, collaboration workflows, content planning, analytics, and asset management
SEO Data API (from $179/month): standalone API with scalable volume, access to backlinks, domains, AI search queries, MCP integration, and automation via tools like Looker Studio, n8n, and Make
24M Credits Plan ($318/month effective): 24M credits/year (billed $3,816/year upfront), suitable for large-scale API usage and automation workflows

SEMrush API

I’ve spent years using SEMrush for high-budget white-hat campaigns because their database size is hard to beat. They claim 43 trillion backlinks, which is just an enormous number of data points. To get your hands on this through an SEO backlink API, you have to be on their Business plan, which costs $499.95 per month. That is a high wall to climb for freelancers, but for big agencies, it is the standard. I find that their link index often catches weird, low-authority links that other crawlers might ignore.

The backlink data API from SEMrush is very robust but can be expensive if you aren’t careful with your unit consumption. A single backlink summary request costs 40 API units. If you are running a SEO backlink extractor API to pull data for thousands of domains, those units vanish quickly. I think you should budget an extra $50 for every million units you need beyond the initial allocation. Maybe that sounds like a lot, but for enterprise-level competitive research, the depth of data usually pays off.

One thing I like about SEMrush is their historical data. You can look back years to see how a competitor built their profile. This is great for a bulk backlink analysis API use case where you want to identify long-term patterns in a niche. I have noticed that their authority score is a bit more volatile than Ahrefs’ DR, but it is still a solid metric for vetting prospects. They also have an AI Visibility Toolkit now, which tracks brand mentions in AI-generated answers.

For developers, the SEMrush backlinks API is very detailed but carries a bit of a learning curve. You get everything from referring IPs to specific link attributes. I find that their support is decent, though you really pay for the privilege of using their infrastructure. If you are looking for the best backlinks API for a massive market research project, SEMrush is likely your best bet. It is more of an all-in-one suite than a specialized link tool, but the link part of the suite is powerful.

Pricing of SEMrush

Pro Plan ($139.95/month): monitor up to 5 websites, keyword research tools, competitor analysis, position tracking, backlink analysis, site audit, and MCP access
Guru Plan ($249.95/month): all Pro features plus monitoring for up to 15 websites, historical data, multi-location and device tracking, and content optimization tools
Business Plan ($499.95/month): all Guru features plus monitoring for up to 40 websites, share of voice tracking, extended limits, API access, and migration support from third-party tools

DataForSEO API

If you are a developer building a custom SEO tool, DataForSEO is probably the backlink API provider you will end up using. I’ve integrated their systems into several proprietary tools because they don’t force you into a monthly subscription for the platform itself. You just deposit a minimum of $100, and you can use that balance across any of their APIs. It is a pure data layer, which I find very refreshing compared to the cluttered interfaces of the big all-in-one tools.

The backlink checker API for developers here uses a “Live” mode that gives you results in about 2 seconds. I find this much better than the asynchronous “task-retrieve” models where you have to wait for a webhook or poll an endpoint. Their index is 2.8 trillion live links, which is comparable to SE Ranking. The cost for a single request with 1,000 rows of data is roughly $0.05.

I use their SEO backlink extractor API when I need to build something specific, like a tool that checks the spam score of 10,000 domains at once. They don’t charge extra for filtering or sorting your data on their servers, which I appreciate. The SEO backlink API they provide is very transparent about rate limits, allowing up to 2,000 calls per minute. If you are doing a bulk backlink analysis API job, you can send 30 simultaneous requests to get through the data faster.

One thing to watch out for is that DataForSEO is a bit more “raw.” You have to handle your own data normalization and dashboarding. But honestly, if you know a bit of Python or PHP, it is the best backlink API for building something unique. I think their customer support is actually some of the best in the business, with a 17-second median response time. For anyone searching for the best backlinks API for a programmatic SEO project, this is the one.

Pricing of DataForSEO

Strict Pay-As-You-Go: You only pay for consumed endpoints. The system requires a bare minimum initial payment of $50 to activate production access.
Live SERP Costs: Executing a real-time Live Mode Google SERP query costs $0.002 per ten search results.
Standard SERP Costs: Throwing a query into the slow Standard Queue costs $0.0012 per ten results.
Backlink Extraction Mathematics: Pulling live backlinks costs $0.02 to initiate the task, plus $0.03 for every 1,000 rows returned.
Keyword Bulk Pricing: Google Ads keyword data inside the Standard Queue costs $0.05 per task. One task holds up to 1,000 keywords.
LLM Commitment Penalty: Accessing the generative AI Mentions endpoints forces a mandatory $100 minimum monthly commitment.

Ahrefs API

Ahrefs is often called the “gold standard” for link data, and I won’t argue with that. I’ve used it for high-stakes link audits where we couldn’t afford to miss a single referring domain. The problem is the cost. To get direct access to their backlink data API, you have to be on the Enterprise plan, which is $1,499 per month. I think that is a tough pill to swallow for a lot of teams. But if you have the budget, their 35 trillion link index is incredibly accurate.

The backlink analysis API v3 from Ahrefs uses a unit system that is a bit complex to calculate. Every request costs at least 50 units, and then it scales based on the number of rows and fields you select. I find that using the select parameter to only pull the fields I need is essential to keep costs down. If you are running a bulk backlink analysis API task, you can use their batch analysis endpoint for up to 100 targets at a time.

I think Ahrefs excels at finding the “quality” of a link profile because their Domain Rating (DR) metric is so widely accepted. When I am doing white-hat guest post outreach, DR is usually the first thing we look at. The backlink checker API for developers allows you to pull these metrics programmatically for your own internal vetting tools. However, I find it annoying that unused units don’t roll over to the next month.

Despite the high price, I still use Ahrefs for deep competitor research because their crawler is just so active. It feels more like a surgical tool than a hammer. I think the best backlinks API for a pro who needs the most “trusted” data is Ahrefs, even if it hurts the wallet. They have a very clean interface for their API documentation, making it easy for a developer to get started if the company is already paying for the Enterprise plan.

Pricing of Ahrefs

Lite Plan ($129/month): 5 projects, 6 months historical data, 750 tracked keywords, 5 tracked prompts, 100k crawl credits, 1,000 credits per user, 1 user (+2 at $40/mo), core tools (Site Explorer, Keywords Explorer, Rank Tracker, Site Audit, Competitive Analysis, API & MCP access, reports, dashboards)
Standard Plan ($249/month): 20 projects, 2 years historical data, 2,000 tracked keywords, 10 tracked prompts, 500k crawl credits, unlimited credits per user, 1 user (+5 at $60/mo), all Lite features plus Content Explorer, batch analysis, SERP comparison, keyword clusters, AI suggestions, deeper analytics & reporting
Advanced Plan ($449/month): 50 projects, 5 years historical data, 5,000 tracked keywords, 20 tracked prompts, 1.5M crawl credits, unlimited credits per user, 1 user (+10 at $80/mo), all Standard features plus Looker Studio integration, advanced site audit options, segmentation, and extended data insights
Enterprise Plan ($1,499/month): all Advanced features plus unlimited API access, SSO & enterprise-grade security, access management & audit logs, unlimited historical data, custom limits & exports, and forecasting & trend analysis (annual commitment required)

Mozscape API

Moz is one of the oldest names in the game, and I still use their Mozscape backlink API for tracking Domain Authority (DA). I think DA is still one of the best metrics for explaining site strength to clients who aren’t SEO experts. Their index is massive, covering 45.5 trillion links. The entry price is actually very low, starting at just $20 per month for 3,000 rows of data. This makes it a great entry point for smaller projects.

The technical setup for the backlinks API at Moz is a bit different because it uses JSON-RPC 2.0 instead of a traditional REST structure. I find that once you get the hang of the HTTP POST requests to their universal endpoint, it works fine. You can pull URL metrics for 25 domains daily on their cheapest paid plan. If you need a backlink checker API for developers that includes spam scores and search intent data, Moz is a strong candidate.

I think Mozscape is the best backlink API provider for those who need a generous free tier. You can make one request every ten seconds for up to 50 rows a month for free. Maybe that isn’t enough for a big project, but it is great for testing your code. Honestly, I find their index a bit slower to update than SEMrush or Ahrefs, but for authority metrics, it is a industry staple.

In my experience, the Moz backlink analysis API is very useful for site migration audits. They have a specific endpoint for checking final redirects, which is a lifesaver when you are trying to map out a massive site change. I think the best backlinks API for someone who just needs reliable authority scores without a lot of technical overhead is Mozscape. It’s affordable, flexible, and the metrics are respected by everyone in the business.

Pricing of Mozscape

Starter Plan (from $20–$75/month): 3,000 rows/month, no overages, +150 beta rows/month, suitable for basic research and reporting integrations
Growth Plan (from $125–$500/month): 50,000 rows/month, overages at $25 per 10,000 rows, +3,500 beta rows/month, designed for scaling businesses needing flexible data access
Advanced Plan (from $2,000/month): 4 million rows/month, overages at $5 per 10,000 rows, +400,000 beta rows/month, built for large-scale custom tools and dashboards
Enterprise Plan (from $10,000/month): 40 million rows/month, overages at $3.50 per 10,000 rows, +4 million beta rows/month, optimized for commercial product integrations at scale

Majestic API

Majestic is the only tool on this list that I think of as a dedicated link tool. I’ve used their Fresh and Historic indexes for years to dig into the background of gray-hat niche sites. The Fresh index is great for seeing what has happened in the last 120 days, while the Historic index goes all the way back to 2006. Their Trust Flow and Citation Flow metrics are unique because they look at the quality of the “neighborhood” a site lives in.

To get into their SEO backlink extractor API, you are looking at $399.99 a month for 100 million analysis units. I did the math on a request for 1,000 links, and it comes out to roughly $0.0336. This makes it very cost-effective for deep link analysis. The backlink checker API for developers from Majestic also supports OpenApps, which lets you build third-party tools that other people can use.

I think the bulk backlink analysis API from Majestic is particularly strong because of their “Clique Hunter” tool. It identifies sites that link to all your competitors but not to you. This is a goldmine for link building. Honestly, their interface looks like it’s from 2010, but the data is top-notch. I think the best backlink API for a link specialist is Majestic because they don’t try to do a hundred other things; they just do links.

They have two separate endpoints for their API: one for development and one for live data. I find this very helpful for testing without burning through your production units. I think the best backlinks API for topical authority is also Majestic, because they categorize the entire web into 800 categories. This lets you see if a site is actually an authority in your specific niche or just a general link farm.

Pricing of Majestic

Lite Plan ($49.99/month): 1 million analysis units, 1 user, access to Fresh Index, Site Explorer, Link Graph, Trust Flow metrics, backlink tools, keyword checker, bulk backlink checker, PDF reports, and core website tools
Pro Plan ($99.99/month): 20 million analysis units, 1 user, everything in Lite plus Historic Index, raw data exports, custom reports, site comparison, backlink history, Search Explorer, email alerts, and extended analytics tools
API Plan ($399.99/month): 100 million analysis units, 5 users, everything in Pro plus full API access, scalable data volumes (up to 1B units), and custom data integration capabilities for agencies and developers

Conclusion

Selecting the right backlink data source depends on your project’s technical requirements and your budget. If you are a developer building a new SaaS, I think DataForSEO is the best backlink API because of its pay-as-you-go pricing and simple REST implementation. For an agency that needs accurate rank tracking and link data in one place, SE Ranking is my top recommendation as a backlink API provider. I’ve found that while Ahrefs and SEMrush have the largest indexes, they often price themselves out of reach for smaller teams.

In my gray-hat and white-hat work, I have learned that no single index is perfect. I think the best strategy is often to use a SEO backlink API for your main reporting and a cheaper, more flexible tool for your massive discovery tasks. For example, using SE Ranking for client dashboards and DataForSEO for your internal scraping tools can save you thousands of dollars a year. Honestly, the most important thing is to test the APIs yourself during their trial periods to see which one catches the most links in your specific industry.

Ultimately, the best backlinks API for you is the one that fits into your existing workflow without adding too much technical debt. Whether you need the 43 trillion links from SEMrush or the topical authority scores from Majestic, ensure you are looking at the unit costs and rate limits before signing a long-term contract. I think the industry is moving toward more transparency in data access, and tools like SE Ranking are leading that charge.

FAQ

1. Why is SE Ranking considered a top choice for a keyword research API?

I think SE Ranking is the best choice because it combines high-quality keyword data with a multi-trillion link index at a fraction of the cost of competitors. It’s a great SEO backlink API for agencies that need to manage both rankings and links in one programmatic interface.

2. Is the DataForSEO backlink analysis API suitable for real-time applications?

Yes, I use their “Live” mode which returns results in about 2 seconds, making it one of the fastest options for a backlink data API. It’s much faster than waiting for a standard task-based queue.

3. What is the minimum cost to access the Ahrefs SEO backlink API?

Honestly, it is quite expensive as you have to be on the Enterprise plan, which is $1,499 per month. I find this to be the biggest barrier for most of my peers who are looking for a backlink checker API for developers.

4. How does the Majestic bulk backlink analysis API help with competitor research?

I think their “Clique Hunter” and Trust Flow metrics are unique for finding high-quality link opportunities that your competitors have already secured. It is a very specialized backlink API provider for link-heavy projects.

5. What is the difference between a credit-based and a unit-based backlink API?

In my experience, credits (like in SE Ranking) usually correspond to one record or one request, while units (like in SEMrush or Ahrefs) often have complex multipliers based on how many fields you pull. I think credits are much easier to budget for.

6. Which backlink checker API offers the best free trial for testing?

I think SE Ranking is the best here because they give you 100,000 free credits for 14 days without requiring a credit card. DataForSEO also has a sandbox, but SE Ranking’s trial is more like a full production environment.

7. Can these APIs track brand mentions in AI search results?

Yes, several of them are adding this now. I’ve seen SE Ranking and SEMrush both launch tools to track citations in LLMs like ChatGPT and Google’s AI Overviews. This is a big part of being the best backlinks API in 2026.