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FilterLists

The directory of adblock and firewall filter lists

🔐 SecurityUNMONITORED
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.

—HOW IT'S SCORED ⓘ
Docs ↗
Status badge · for your READMEshipapis health badge: — · unmonitored
ON PROBE SCHEDULE

We probe a documented GET and expect 2xx JSON — full uptime and health score. Open provider docs ↗

Uptime historystarts after first probe

On our probe schedule. Uptime charts appear after the first check lands.

Example responsefrom provider docs — not verified by us
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 · 6On scheduleFULL DOCS ↗
On schedule — GET /lists awaits first probe
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

Not tracked yet. Shape-change history starts once this API joins our probe schedule.

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?

FilterLists is catalogued but not yet on our probe schedule, so we don't publish a live status for it. Check the provider's own status page or docs for its current state.