# Linkheft API by CyberMax

> 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.

Send up to 50 domains, URLs or emails and get each one's 0-100 authority score, its rank among 133,241,980 domains in the Common Crawl web graph, its trend since the last release, and its Majestic Million rank and referring subnets. For SEO tools, link builders, lead scoring and AI agents. 1,000 free lookups a day, no key; plans from $19/month.

## API (free tier without a key; paid API keys for more)
- [/api/rank](https://linkheft-api.cybermax-tools.workers.dev/api/rank?domain=stripe.com,notion.so,wikipedia.org): Authority score, web rank, trend and Majestic links for up to 50 domains
- [/api/dataset](https://linkheft-api.cybermax-tools.workers.dev/api/dataset): Which data release the answers come from (not metered)
- GET for simple calls, POST a JSON body for lists. Same field names as the bulk version's dataset records.
- OpenAPI 3.1: https://linkheft-api.cybermax-tools.workers.dev/openapi.json

## MCP (remote, streamable HTTP, no auth)
- Endpoint: https://linkheft-api.cybermax-tools.workers.dev/mcp
- `domain_authority`: Authority score (0-100), Common Crawl web-graph rank (harmonic + PageRank), hosts, previous rank and trend, Majestic Million rank, referring subnets and IPs for 1-50 domains, URLs or emails. found=false when a domain is outside the top 10M and the Majestic Million.
- `dataset_info`: The Common Crawl web-graph release, Majestic Million date, as-of date and size of the data behind domain_authority.

## Limits
- Up to 50 domains, URLs or emails per call; 10 calls a minute per IP on the free tier.
- Free tier: 1,000 domain lookups a day per IP, no key. Paid keys from $19/month (see Get an API key).
- Each domain in a call counts as one lookup (duplicates in the same call count once). Failed calls are not counted.
- Data: Common Crawl web graph cc-main-2026-jul-aug-sep (133,241,980 domains, top 10 million kept) + Majestic Million 2026-09-23; refreshed when a new web graph ships (about every 3-4 months).
- Authority is a transparent log-scale of the open web-graph rank, not Moz DA or Ahrefs DR; use it to compare and sort sites.

## More
- Health: https://linkheft-api.cybermax-tools.workers.dev/health
- All CyberMax tools: https://cybermax-tools-cybermax.static.hf.space/
- Loop over longer lists 50 domains at a time. For 100,000-domain lists, CSV export and a monitor mode that returns only changed domains, the Linkheft tool on the Apify Store does the same lookups in bulk.

## Pricing
- Free: 1000 domain lookups a day per IP, 10/min, no key.
- Prospector: $19/month, 100,000 domain lookups a month, 30/min. Buy: https://linkheft-api.cybermax-tools.workers.dev/buy/prospector?s=llms
- Agency: $49/month, 500,000 domain lookups a month, 60/min. Buy: https://linkheft-api.cybermax-tools.workers.dev/buy/agency?s=llms
- Platform: $99/month, 2,000,000 domain lookups a month, 120/min. Buy: https://linkheft-api.cybermax-tools.workers.dev/buy/platform?s=llms
- Pay as you go: $5, 25,000 domain lookups (one-time pack, no expiry), 30/min. Buy: https://linkheft-api.cybermax-tools.workers.dev/buy/payg?s=llms
- Prospector yearly: $190/year, 100,000 domain lookups a month, 30/min. Buy: https://linkheft-api.cybermax-tools.workers.dev/buy/prospector-yearly?s=llms
- Agency yearly: $490/year, 500,000 domain lookups a month, 60/min. Buy: https://linkheft-api.cybermax-tools.workers.dev/buy/agency-yearly?s=llms
- Platform yearly: $990/year, 2,000,000 domain lookups a month, 120/min. Buy: https://linkheft-api.cybermax-tools.workers.dev/buy/platform-yearly?s=llms
- Use the key as `x-api-key: KEY` or `Authorization: Bearer KEY` (MCP too). Usage: https://linkheft-api.cybermax-tools.workers.dev/key. Machine-readable: https://linkheft-api.cybermax-tools.workers.dev/pricing.json