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Every addon in a Core Builds template is there for a specific reason. This page explains the scraper hierarchy, what each addon contributes, and why the flood guard caps are set the way they are.

The Scraper Hierarchy

Core Builds organises scrapers into three tiers based on speed, quality, and role.
1

Primary scrapers — run first, fast

These fire immediately on every request. They’re fast enough that waiting for all of them adds minimal latency. They cover the vast majority of popular cached content.Zilean, MediaFusion, HdHub, EZTV, Newznab (Usenet), StremThru Torz, Library
2

Secondary scrapers — conditional, slower

These only run when the primary group returns fewer than 3 cached streams. For popular titles, they never fire. For niche or new content, they kick in as a deeper search.Meteor, Comet RD
3

Backup scrapers — last resort, capped at 1 result each

These run alongside the primary group but are capped at a single result each. They’re too slow to be first-resort scrapers but can catch a cache hit when everything else misses.Knaben, Torrent Galaxy, TorrentsDB

Service Addons

These are not scrapers — they deliver or manage streams rather than finding them.

StremThru Torz

The TorBox stream delivery service. Every stream found by the scrapers goes through StremThru Torz to be resolved into a playable URL via TorBox’s debrid infrastructure. Without this, nothing plays. includeP2P: false — direct BitTorrent streams are disabled. TorBox handles delivery via its own infrastructure.

Library

Your TorBox saved-items list — continue watching, items you’ve previously added. Always runs first with the lowest timeout (3s). Exposes catalog and meta intentionally so your TorBox library appears in Stremio.

AIOSubtitle

Subtitle search across OpenSubtitles, Subscene, and other sources. Runs once per request, low overhead.

Primary Scrapers

Zilean

A fast cached-content index. Zilean only returns streams it knows are already in a debrid cache — it doesn’t return uncached torrents. This makes it extremely low latency and high signal for the results it does return. It’s the first scraper to query for cached hits. Timeout: 4000ms. Why primary: Speed + cache-only signal.

MediaFusion

A general-purpose scraper with broad coverage — particularly strong on regional and international content that English-only scrapers miss. It also surfaces content from a wider range of indexers than most scrapers. Enabled by default from v2.9.4. resources: ['stream'] is mandatory — without it, MediaFusion injects its own catalog rows into Stremio Discover, which open the scraper’s website instead of playing content. Timeout: 7000ms. Flood guard: ≤ 4 results. Why primary: Fills regional gaps Meteor and Comet miss.

HdHub

A TorBox-native P2P scraper (tb_only: true). It only returns results when TorBox is the active debrid service, and it’s particularly strong on cached P2P content that the general scrapers don’t index. Not present on AllDebrid templates. Not present on Lite, Flash, or Speed templates. Timeout: 5000ms. Flood guard: ≤ 3 results. Why primary: TorBox-specific cached content not found elsewhere.

EZTV

A TV-series-only indexer. EZTV is fast and has excellent coverage of English-language TV — but it indexes nothing else. It’s excluded from Flash and EasyNews Speed templates because those are cached-only setups where TV-series-specific uncached torrents from EZTV are unlikely to be pre-cached. Timeout: 5000ms. Flood guard: ≤ 3 results. Why primary: Fast, TV-only, fills series gaps.

Newznab (Searchⁿᶻᵇ)

The Usenet NZB search addon. Finds content on Usenet newsgroups — a completely separate content network from torrents. Usenet content on TorBox appears as “instant” streams because TorBox’s Usenet infrastructure pre-downloads NZBs to its servers. Requires: TorBox Pro (Usenet support) and a Usenet indexer (e.g. NZBGeek). Without both, this addon returns nothing. Timeout: 5000ms. Why primary: Usenet is a distinct content source — different files, different availability, often higher quality encodes than torrent equivalents.
Usenet is only useful if you have an indexer. “Instant” streams in your list are often Usenet NZBs that TorBox has already cached — not the same as uncached torrents.

Secondary Scrapers

These sit behind the primary group and only fire when the primary group returns fewer than 3 cached streams. For popular titles this never happens. For new releases or niche content, they provide a deeper search.

Meteor

The largest general-purpose scraper. Meteor indexes an enormous range of content across many indexers — it will find things the primary scrapers miss, but it takes longer to respond. It’s in the secondary group specifically because making it wait unconditionally would slow every single request. From v2.9.7 the timeout is 6000ms (was 10000ms). Combined with the 5-second dynamic fetching exit on 4K Apex, Meteor is now capped at a sensible wait time for niche queries. Flood guard: ≤ 5 results. Why secondary: High coverage, too slow to be primary.

Comet RD

Comet with a Real-Debrid credential. Returns streams already cached in Real-Debrid’s infrastructure — useful on Hybrid templates (TorBox + RD) where RD-cached content is a valid source. On TorBox-only templates it still runs but its RD-cached results may not be directly playable without an active RD subscription. Timeout: 7000ms. Flood guard: ≤ 5 results. Why secondary: RD cache coverage, complements Meteor.

Backup Scrapers

These run alongside the primary group but are hard-capped at 1 result each. They exist to catch a single cache hit when everything else misses — not to contribute a full list of results. Letting them contribute more would flood the stream list with low-quality or duplicate results.

Knaben

A large public torrent meta-search. Knaben is broad but slow and returns many low-quality results. Capped at 1 so it can catch one good cache hit without polluting the list.

Torrent Galaxy

A public torrent indexer. Similar profile to Knaben — useful as a last-resort cache hit but not fast or precise enough for front-line use. Capped at 1.

TorrentsDB

A Torrentio fork that aggregates 21+ providers: YTS, 1337x, Nyaa, AnimeTosho, Rutor, Rutracker, Torrent9, and regional trackers. TorBox native — no API key required. Where it adds value is niche content, anime, and older releases that the main scrapers don’t index well. Capped at 1 as a backup. Added in v2.9.5.

Flood Guard Caps (Current — v2.9.5+)

The Per-Addon Flood Guard ESE limits how many results any single scraper can contribute. Without it, one slow or noisy scraper can return 20 low-quality results and push better cached streams off the bottom of the list.
ScraperCap
Meteor≤ 5
Comet RD≤ 5
MediaFusion≤ 4
EZTV≤ 3
HdHub≤ 3
Torrent Galaxy≤ 1 (backup)
Knaben≤ 1 (backup)
TorrentsDB≤ 1 (backup)
Library and SeaDex results are excluded from the flood guard — those are always shown in full.

What Happens If You Disable a Scraper?

ScraperImpact of disabling
StremThru TorzNothing plays — it’s the delivery service
LibraryYour TorBox saved items and continue watching disappear
ZileanSlower cache hit detection on first query
MediaFusionRegional and international content gaps; less coverage on non-English titles
HdHubLose TorBox-native P2P results not indexed elsewhere
EZTVLose fast TV-series results; series coverage drops on popular shows
NewznabLose all Usenet/instant results; “instant” streams disappear from list
MeteorSignificant drop in coverage for niche/new content; secondary group still fires via Comet
Comet RDLose RD-cached results; on Hybrid templates this is meaningful
Knaben / Torrent Galaxy / TorrentsDBMinimal — occasional missed cache hit on niche content
AIOSubtitleNo subtitles

For the technical resources field reference and catalog bleed prevention, see the Addon Reference.