Rankfield API docs
Call Rankfield's SEO and web data API: Site Strength, referring domains, search suggestions and live page data, with one API key.
Make your first request
- Copy a key from the API key panel. No sign-up.
- Send it as a bearer token:
cURL
curl https://rankfield.dev/v1/domains/wikipedia.org/site-strength \
-H "Authorization: Bearer $RANKFIELD_API_KEY"- Read the JSON:
{"domain": "wikipedia.org", "siteStrength": 100}.
The Quickstart has the same in Python and JavaScript.
Endpoints
| Endpoint | What you get | Request |
|---|---|---|
| Site Strength | A domain's 0–100 link authority score | GET /v1/domains/{domain}/site-strength |
| Referring Domains | How many domains link to a site, and the strongest 20 | GET /v1/domains/{domain}/referring-domains |
| All Referring Domains | Every linking domain, paged or as CSV | GET /v1/domains/{domain}/referrers |
| Link Extraction | Every link on a live page, with anchor text and rel | GET /v1/html/link-extraction?url= |
| Scrape | A page as Markdown, with metadata, links and structured data | GET /v1/scrape?url= |
| Bot View | Which of 274 crawlers and AI bots may read a page | GET /v1/bot-view?url= |
| Brand | A company's logos, colours, fonts and profiles | GET /v1/brand?domain= |
| Site Map | Every URL of a website | GET /v1/map?domain= |
| Site Audit | Every page of a website checked for technical SEO and AEO problems | POST /v1/site-audit |
| Bing Suggest | Bing autocomplete for a keyword | GET /v1/bing/suggest?query= |
| DuckDuckGo Suggest | DuckDuckGo autocomplete for a keyword | GET /v1/ddg/suggest?query= |
| Yahoo Search Predictions | Yahoo's predictions for a keyword | GET /v1/yahoo/search-predictions?query= |
Every endpoint takes the same key. For many URLs, domains or keywords at once, each one also has batch jobs.
Before you build
AuthenticationSend the key, get one from code, and keep it safe.ErrorsStatus codes, error bodies and which errors to retry.Rate limitsHow much one request or job holds, and what to do about a 429.Batch jobsStart a job, follow it, and read results as they finish.
For AI agents
For coding agentsThe whole API on one page: auth, which endpoint to pick, timeouts and gotchas.MCP serverConnect Claude, Cursor or any MCP client with your key.Agent skillOne SKILL.md file that teaches an agent to use Rankfield.llms.txt and Markdown pagesEvery page as Markdown, indexed in /llms.txt.