Scale Twitch EventSub subscriptions using EventSub Conduits
domain: gaming · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Obtain an app access token, then call POST /helix/eventsub/conduits with a shard_count to create a conduit (up to 5 enabled conduits per client, up to 20,000 shards per conduit)
Call PATCH /helix/eventsub/conduits/shards to assign each shard a transport (webhook callback URL, or a WebSocket session ID)
Create EventSub subscriptions as normal, but target the conduit ID instead of an individual webhook/websocket transport, so Twitch load-balances delivery across shards
When using WebSocket shards, bind the new session to its shard within 10 seconds of receiving the Welcome message or the shard assignment fails
Use GET /helix/eventsub/conduits and PATCH /helix/eventsub/conduits to monitor and rescale the shard count as load changes
Keep at least one shard active per conduit; an unreactivated conduit with no enabled shards auto-deletes after 72 hours
Known gotchas
If both the primary and fallback transport for a shard become disabled, notifications for that shard drop silently with no error surfaced to the app
A new WebSocket session must be bound to its assigned shard within 10 seconds of the Welcome message, which is easy to miss under connection latency or retry logic
A conduit is automatically deleted after 72 hours with no active shards, so a long outage in your infrastructure can lose the conduit entirely, not just miss events
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