Snapshot vs delta on the Pinnacle WebSocket

Answer: after subscribe, wait for snapshot parts until final: true, then apply every delta upsert/remove. Clear local maps when part === 1. Docs: WebSocket.

Mental model#

1. Snapshot — current matching book, split into parts (≤400 events).
2. Delta — only changes: market/event upsert (full object) or remove (id).
3. Ping — reply {"type":"pong"}.

if (msg.type === 'snapshot' && msg.part === 1) { events.clear(); markets.clear(); }

Node reconnect pattern: answer.

Trial CTA#

Builder (€99/mo) for WebSocket and closing history. 3-day trial; card required, charged after day 3 unless cancelled. Free REST: signup. Related: answers hub, docs.

See also: raw Pinnacle frames (Pro).

Related: Node snapshot/delta Map, dynamic odds API.

Questions people ask#

Can I apply deltas before final snapshot?#

You can buffer, but treat the book as incomplete until final: true.

Do removes cascade?#

When an event is removed, drop all of its markets locally.

Is this educational content for adults?#

Yes (18+).