Best Backlink Data APIs for Developers (2026)

Why Backlink Data APIs Matter

Backlinks remain one of the strongest ranking signals in search engines. Programmatic access to backlink data enables developers and businesses to:

• SEO Auditing: Analyze your backlink profile for toxic links, anchor text distribution, and link quality
• Competitive Analysis: Reverse-engineer competitor link-building strategies and find link opportunities
• Domain Valuation: Assess website authority using trust flow, citation flow, and referring domain counts
• Link Prospecting: Identify high-authority sites for outreach and guest posting
• Due Diligence: Evaluate domain quality before acquisitions or partnerships
• Monitoring: Track new and lost backlinks over time to measure link-building ROI

1. Netrows

Backlink Data Coverage

Netrows provides a single, comprehensive Majestic endpoint that returns a complete site backlink overview in one API call:

• Trust Flow: Majestic's proprietary metric measuring the quality of backlinks pointing to a site (0-100)
• Citation Flow: Measures the quantity/influence of backlinks pointing to a site (0-100)
• Backlink Count: Total number of external backlinks discovered
• Referring Domains: Number of unique domains linking to the site

Pros

• Complete Majestic site overview in a single API call at 5 credits
• Trust Flow and Citation Flow — Majestic's gold-standard link quality metrics
• Combined with 30+ other data sources (LinkedIn, X, GitHub, etc.) in one API
• Real-time data, not cached
• Interactive API documentation with OpenAPI spec
• No annual contracts or minimum commitments

Cons

• Single endpoint (site overview only, no individual backlink listings)
• No Python/Node SDK yet (REST API only)
• Newer platform compared to established backlink tools

Pricing

The Majestic endpoint costs 5 credits per call. Subscriptions start at €49/month for 10,000 credits, giving you 2,000 backlink lookups per month. No hidden fees or per-seat pricing.

2. Majestic API (Official)

Pros

• Largest backlink index in the industry (trillions of URLs)
• Granular link-level data: individual backlinks, anchor text, link context
• Trust Flow and Citation Flow — the original source
• Historical index for tracking link changes over time
• Topical Trust Flow for niche relevance analysis

Cons

• API access starts at $49.99/month but full API requires $99.99+/month plans
• Complex API with multiple endpoints and data units to manage
• Data units consumed per request — can be expensive for bulk analysis
• No traffic or keyword data — backlinks only
• Interface and documentation feel dated compared to competitors

3. Ahrefs API

Pros

• Second-largest backlink index after Majestic
• Domain Rating (DR) and URL Rating (UR) as authority metrics
• Backlinks combined with organic traffic and keyword data
• Fast index updates — new links discovered quickly

Cons

• API access is enterprise-only with opaque pricing
• Row-based limits can be restrictive for large-scale analysis
• No Trust Flow equivalent — DR is a different methodology
• Expensive for teams that only need backlink data

4. Moz Link API

Pros

• Domain Authority (DA) — widely recognized authority metric
• Free tier available (limited requests)
• Simple, well-documented API
• Spam Score for identifying toxic links

Cons

• Smaller backlink index compared to Majestic and Ahrefs
• Slower index updates
• Limited granularity in link-level data
• DA can be manipulated and is less trusted by advanced SEOs
• API rate limits are restrictive on lower plans

5. SEMrush Backlinks API

Pros

• Backlinks integrated with keyword, traffic, and competitive data
• Authority Score combining multiple signals
• Toxic link identification and disavow file generation
• Good API documentation and support

Cons

• Backlink index is smaller than Majestic and Ahrefs
• API units consumed per request — expensive for bulk backlink analysis
• Full API access requires higher-tier plans ($229.95+/month)
• Per-seat pricing adds up for teams

Pricing Comparison

Which Backlink API Should You Choose?

For Multi-Platform Data Pipelines

Recommendation: Netrows — If you need backlink authority metrics alongside LinkedIn, X, GitHub, or other platforms, Netrows gives you Majestic Trust Flow and Citation Flow in one API call at 5 credits, combined with 30+ other data sources.

For Deep Backlink Analysis

Recommendation: Majestic API — If you need individual backlink listings, anchor text analysis, and the largest link index available, the official Majestic API provides the most comprehensive backlink dataset.

For All-in-One SEO

Recommendation: Ahrefs or SEMrush — If you need backlinks alongside keyword research, traffic estimates, and competitive analysis, either platform provides a comprehensive SEO toolkit with solid backlink coverage.

For Quick Domain Authority Checks

Recommendation: Netrows — For lead qualification, domain valuation, or quick authority assessments where you need Trust Flow and Citation Flow without managing complex SEO tool subscriptions, Netrows delivers the essentials at a fraction of the cost.

Frequently Asked Questions