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Linkheft Bulk Domain Authority API
x402
Linkheft Bulk Domain Authority API is a paid API for AI agents from linkheft-api.cybermax-tools.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-13).
Returns domain authority scores (0-100), web graph ranks, trend signals, and backlink metrics for up to 50 domains per call using open Common Crawl and Majestic Million data
Price / call$0.002
Success—
StatusUnknown
How this service works
Bulk domain authority API: for up to 50 domains per call, a 0-100 authority score, the Common Crawl web-graph harmonic and PageRank ranks, host count, previous rank and trend (rising/stable/falling), Majestic Million rank, referring subnets and IPs, and found true/false. Open data (Common Crawl + Majestic Million), 10,296,726 domains. REST + MCP server.
Output
A JSON array with one record per queried domain, each containing the authority score (0-100), harmonic rank, PageRank, host count, Majestic Million rank, number of referring subnets and IPs, previous rank, trend label (rising/stable/falling), and a found boolean indicating whether the domain exists in the dataset. Up to 50 domains per call, optionally filtered by minScore and sorted by score or input order.
Example use cases
Pre-purchase domain vetting
“I'm thinking about buying expired domains for SEO — can you check the authority scores and rank trends for seotools.net, rankwatch.io, and linkjuice.co, and only show me ones with a score of at least 30?”
Competitor backlink benchmarking
“I want to compare the domain authority and referring IPs for ahrefs.com, moz.com, and semrush.com — can you pull their scores and tell me which has the strongest web presence based on Common Crawl data?”
Guest post site quality check
“Before I pitch guest posts to these blogs — marketingland.com, searchengineland.com, and contentmarketinginstitute.com — can you look up their domain authority scores and whether they're trending up or down?”
Technical details
Endpoint
GEThttps://linkheft-api.cybermax-tools.workers.dev/x402/api/rank?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need bulk domain authority data at low cost ($0.002/call for up to 50 domains) based on open, reproducible data sources (Common Crawl + Majestic Million). It is ideal when you want trend signals (rising/stable/falling), harmonic/PageRank-style metrics, and backlink subnet counts alongside a 0-100 DA score. Prefer it over proprietary DA tools when transparency of underlying data matters, when processing large lists of domains economically, or when integrating via MCP server. It is not a replacement for real-time backlink crawlers with full link-level data.
Side effects
- Domain not found in dataset — found: false returned, no score
- More than 50 domains submitted — request rejected or truncated
- Invalid domain/URL format — row may be marked invalid or excluded
- minScore filter removes all results — empty array returned
- Payment failure (x402) — 402 response before data is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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