API Reference

All endpoints return JSON. Most endpoints require an API key — get one free at /dashboard. The /stats endpoint is public.

Authentication

Pass your API key as a Bearer token in the Authorization header.

Authorization: Bearer llmi_your_key

Rate limits

Free tier (API key)30 req / min

POST /check — unauthenticated10 req / min

GET /statsUnlimited (public)

Need higher limits? Contact us.

Base URL

https://llmsindex.dev/api/v1

Endpoints

GET/domainsList domains with llms.txt

GET/domains/:domainSingle domain details + content

GET/domains/:domain/historyVersion history

GET/statsGlobal adoption stats

POST/checkCheck any domain on-demand

GET /domains

Returns paginated list of domains that have llms.txt.

Query parameters

page1Page number (1-based)

limit50Results per page (max 100)

qSearch by domain name

has_llms_txttrueFilter by presence (true/false)

curl https://llmsindex.dev/api/v1/domains?limit=10&q=stripe \
  -H "Authorization: Bearer llmi_your_key"

GET /domains/:domain

Returns full details for a domain including the stored llms.txt content.

curl https://llmsindex.dev/api/v1/domains/stripe.com \
  -H "Authorization: Bearer llmi_your_key"

GET /domains/:domain/history

Returns the version history — each entry represents a detected content change.

curl https://llmsindex.dev/api/v1/domains/stripe.com/history \
  -H "Authorization: Bearer llmi_your_key"

GET /stats

Global adoption statistics. Cached for 5 minutes.

curl https://llmsindex.dev/api/v1/stats

{
  "total_checked": 10000,
  "total_with_llms_txt": 1402,
  "adoption_rate": 14.0,
  "new_this_week": 47
}

POST /check

Check any domain on-demand. Results are cached (1h for unauthenticated, 5min for API key holders).

curl -X POST https://llmsindex.dev/api/v1/check \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer llmi_your_key" \
  -d '{"domain": "example.com"}'