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FilterLists

The directory of adblock and firewall filter lists

🔐 SecurityHEALTHYchecked 12h ago
AUTH NONECORS ✗AGENT ✓HTTPS ✓COMMERCIAL ?

FilterLists catalogs hundreds of filter lists used by ad blockers, firewalls, and hosts files, along with their maintainers, licenses, syntaxes, and languages. The REST endpoint returns the full catalog as JSON so you can build tooling around block-list metadata. Keyless, though it sends no CORS headers.

94HOW IT'S SCORED ⓘ
Docs ↗
Status badge · for your READMEshipapis health badge: 94 · healthy
Uptime history
98.0%90 days
96.7%30 days
357P50 · ms
1813P95 · ms
operationalpartialdownno data
Response time · last 48 checks
Fastest 48 ms, slowest 1238 ms, most recent 341 ms.
Live response samplecaptured by our last successful check
GET https://api.filterlists.com/lists

[
  {
    "id": 1,
    "name": "AdGuard Japanese filter Plus",
    "description": "This complements AdGuard Japanese filter and mainly consists of additional generic and specific rules…",
    "licenseId": 4,
    "syntaxIds": [
      4
    ],
    "languageIds": [
      73
    ],
    "tagIds": [
      2
    ],
    "maintainerIds": [
      150
    ]
  }
]
Call itcurl · fetch · python
curl "https://api.filterlists.com/lists"
const res = await fetch("https://api.filterlists.com/lists");
const data = await res.json();
console.log(data);
import requests

res = requests.get("https://api.filterlists.com/lists")
print(res.json())

BROWSER CALLS BLOCKED (NO CORS/HTTPS) — USE THE CURL SNIPPET

Endpoints · 6HealthyFULL DOCS ↗
Monitored path responding — GET /lists357 mschecked 12h ago
GET/listsPROBED

The directory of adblock and firewall filter lists

GET/random

Random item from the collection.

GET/lists?limit=5

Paginated variant with limit parameter.

GET/languages

Supported language codes.

GET/licenses

Licenses — documented GET route.

GET/lists/{id}

{Id} — documented GET route.

Machine-readable spec

We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.

Response-shape history

Stable. No schema drift observed since monitoring began — the response shape has not changed under our checks.

FilterLists: common questions

Is FilterLists free to use?

Yes — FilterLists is a free security API. Free tier: Free — no key required. Whether the free tier allows commercial use is unclear — check the provider docs.

Does FilterLists need an API key?

No — FilterLists needs no API key or signup. You can call it straight away; rate limits still apply (Unpublished).

Can I call FilterLists from the browser?

Not directly — FilterLists doesn't send browser-friendly CORS headers, so call it from a server or proxy instead. Copy the curl or Python snippet on this page to get started.

Is FilterLists up right now?

As of our last scheduled check, FilterLists is healthy with 98.0% uptime over 90 days and a 357 ms median response. We re-probe it every sweep — the status badge and uptime chart above always show the latest.