The Best Backlink API in 2026: 6 Options Ranked by Workload

"Best backlink API" is the wrong question until you name the workload. The API that wins for a one-off 500-domain scoring job loses badly for real-time link monitoring, and vice versa. So this ranking is honest about the axis: we rank by fit per workload, we put ourselves where we genuinely belong, and every option carries its real limitation. Pricing is as of September 2026 — this market reprices constantly, so re-verify before committing.

If you want the UI-tool version of this question (checkers, not APIs), that's a different list: best backlink checker tools.

The short answer

1. RankParse — best for pay-per-call link data

RankParse is a backlink and domain-intelligence API built on open web data (Common Crawl, HTTP Archive, CrUX, Tranco), sold as prepaid credits: 100 free credits with no card, then $10/1,000 credits, down to $0.006/credit at the $600 pack. A backlinks call is 2 flat credits for up to 1,000 rows — $0.012–$0.02 per 1,000 backlinks — one synchronous GET with an X-API-Key header. Referring domains, anchors, top pages, link intersect, and domain authority round out the link surface, and there's an MCP server on the free tier for Claude, ChatGPT, and Cursor.

import os
from rankparse import RankParseClient

with RankParseClient(api_key=os.environ["RANKPARSE_API_KEY"]) as client:
    result = client.backlinks("stripe.com", limit=1000)

backlinks = result["data"]  # 2 credits, flat

The honest limitation: the index rebuilds from quarterly open-data releases. A link that appeared last week may not surface until the next release. For batch and stored-data workloads that's rarely the question being asked; for live monitoring it disqualifies us — use Ahrefs or DataForSEO for that.

2. DataForSEO — best raw rows at volume

DataForSEO's Backlinks API serves a 1.9-trillion-link live index at $0.024 per task + $0.000036 per row ($0.06 per 1,000-row pull), pay-as-you-go with a $50 minimum top-up and no expiry. Since July 2026 there's no monthly minimum on the Backlinks API. At serious volume, nobody beats the per-row floor.

The limitation: it's infrastructure, not a product — Basic Auth, POST task arrays, nested response envelopes, and two-factor pricing to model. Great value if you'll amortize the integration; overhead if you won't. More in our DataForSEO alternatives breakdown.

3. Ahrefs API — best index, priciest rows

The freshest, largest proprietary link index (~35T links claimed), behind a $129/mo minimum plan gate with unit metering: 50-unit request minimum, per-row-per-field costs, and third-party math around $5.00 per 1,000 backlinks. If your product's value is "we saw the link first," pay it happily.

The limitation: the economics. No API-only product, no free tier, and unit allowances that even Ahrefs' own materials have reported inconsistently. Full teardown: Ahrefs API review and Ahrefs API alternatives.

4. Majestic — best link history

Fresh + Historic indexes and the Trust Flow / Citation Flow metrics that the link-buying and domain-trading world runs on. Full API access sits on the API plan at $399.99/mo (100M analysis units); the cheaper dashboard plans don't unlock it.

The limitation: links only — no keywords, no SERP — plus dated tooling and a $400/mo cliff with nothing below it. Head-to-head: RankParse vs Majestic.

5. Moz API — best simple metering for authority metrics

A genuine free tier (~50 rows/month), then predictable row-based plans from $20/mo for 3,000 rows. Domain Authority remains the industry-default metric, and the billing is the easiest to explain on this page.

The limitation: smaller, staler index; row costs get uncompetitive at scale; unused rows expire with the month. If DA lookups are the whole job, compare the cheap domain authority API options first.

6. SE Ranking Data API — best bundled breadth, worst entry shape

Backlinks + keywords + SERP + AI-visibility data in one API — real breadth. The entry shape is the problem: $2,148/year, billed annually, with no pay-as-you-go path.

The limitation: a 200x larger first invoice than a $10 credit pack, and a smaller link index than Ahrefs or Majestic. Head-to-head: RankParse vs SE Ranking Data API.

The worked scenario

Backlinks for a 500-domain list, up to 1,000 rows each, as a one-off batch:

• RankParse: 1,000 credits = $10 (the free tier covers the first 50 domains)
• DataForSEO: ~$30 of usage, after the $50 minimum top-up
• Ahrefs: $129/mo gate + ~$2,500 in unit value (third-party math)
• Majestic: $399.99/mo plan required
• Moz: 500K rows lands in the $500/mo tier
• SE Ranking: $2,148/year contract required

For batch link work, pay-as-you-go wins by one to three orders of magnitude. Run your own volume on the pricing page.

FAQ

What is the best backlink API overall?

There's no single winner — it depends on whether you're optimizing for entry cost (RankParse), per-row cost at volume (DataForSEO), index freshness (Ahrefs), or link history (Majestic). The table at the top maps workload to pick.

What is the cheapest backlink API?

Per 1,000 rows: RankParse ($0.012–$0.02, 2 flat credits) and DataForSEO (~$0.06). RankParse is cheaper to start (no deposit, 100 free credits); DataForSEO's row floor wins at very large volume.

Which backlink API has a free tier?

RankParse (100 credits, no card), Moz (~50 rows/month), and DataForSEO ($1 trial credit). Ahrefs, Majestic, and SE Ranking have none.

Do I need a live index or a stored one?

Ask what your decision depends on. "Who links to this domain, roughly, and how authoritative is it?" — a stored open-data index answers that for a fraction of the price. "Did anyone link to us this week?" — you need a continuously-crawled index (Ahrefs, DataForSEO).

Can AI agents use these APIs?

All of them via REST, but MCP support varies a lot — from RankParse's free-tier MCP server to Ahrefs' $129/mo-gated one. We compared them all in best SEO API for AI agents.

Score your first 50 domains free: get a RankParse API key — 100 credits, no card, no subscription.