# Rate limits, user limits and heartbeats

Websockets

**Connection & message limits:**

<table><thead><tr><th width="84.01959228515625"></th><th width="164.9609375">Max Connections</th><th width="202.1195068359375">Max Total Subscriptions</th><th>Max msgs to Hydromancer per minute</th><th>Orderbooks streamed</th></tr></thead><tbody><tr><td><strong>Starter</strong></td><td>50</td><td>500</td><td>300</td><td>5</td></tr><tr><td><strong>Growth</strong></td><td>500</td><td>5000</td><td>3000</td><td>10</td></tr><tr><td><strong>Scale</strong></td><td>1000</td><td>10000</td><td>6000</td><td>100</td></tr></tbody></table>

**Note**: every address passed in subscription logic counts as 1 subscription for ones where you can pass multiple (applicable to userFills, userOrderUpdates, userNonFundingLedgerEvents, userLeverageUpdates and userIsolatedMarginUpdates).

**Subscription type limits:**

|                                   | Starter                             | Growth                       | Scale                        |
| --------------------------------- | ----------------------------------- | ---------------------------- | ---------------------------- |
| **userFills**                     | unlimited per key                   | unlimited per key            | unlimited per key            |
| **builderFills**                  | 1 builder per key, add-ons possible | 3 builders, add-ons possible | 3 builders, add-ons possible |
| **liquidationFills**              | 1 sub per key                       | 2 subs per key               | 2 subs per key               |
| **allFills** - *add-on websocket* | 400$ per connection                 | 400$ per connection          | 400$ per connection          |
| **userOrderUpdates**              | unlimited per key                   | unlimited per key            | unlimited per key            |
| **builderOrderUpdates**           | 1 builder per key, add-ons possible | 3 builders, add-ons possible | 3 builders, add-ons possible |
| **userNonFundingLedgerEvents**    | unlimited per key                   | unlimited per key            | unlimited per key            |
| **allUserNonFundingLedgerEvents** | 1 sub per key                       | 2 subs per key               | 2 subs per key               |
| **allTwapStatusUpdates**          | 1 sub per key                       | 2 subs per key               | 2 subs per key               |
| **activeAssetCtx**                | unlimited per key                   | unlimited per key            | unlimited per key            |
| **setOracleUpdates**              | 100 subs per key                    | 100 subs per key             | 100 subs per key             |
| **l4BookUpdates**                 | 5 coins                             | 50 coins                     | 200 coins                    |
| **l2Book**                        | 5 coins                             | 25 coins                     | 100 coins                    |
| **l2BookDiff**                    | 5 coins                             | 50 coins                     | 200 coins                    |
| **bbo**                           | 10 coins                            | 50 coins                     | 200 coins                    |
| **candle**                        | 10 subs per key                     | 50 subs per key              | 100 subs per key             |
| **userLeverageUpdates**           | unlimited per key                   | unlimited per key            | unlimited per key            |
| **allLeverageUpdates**            | 1 sub per key                       | 2 subs per key               | 3 subs per key               |
| **userIsolatedMarginUpdates**     | unlimited per key                   | unlimited per key            | unlimited per key            |
| **allIsolatedMarginUpdates**      | 1 sub per key                       | 2 subs per key               | 3 subs per key               |
| **fundingRates**                  | 1 sub per key                       | 1 sub per key                | 1 sub per key                |
| **builderCompletedTrades**        | 1 builder per key, add-ons possible | 3 builders, add-ons possible | 3 builders, add-ons possible |
| **builderLiquidations**           | 1 builder per key, add-ons possible | 3 builders, add-ons possible | 3 builders, add-ons possible |

All-books add-ons (`l4BookUpdatesAll`, `l2BookDiffAll`, `l2BookAll`, `bboAll`) are separate permission-gated subscriptions. They are not counted as separate per-coin subscriptions.

**Heartbeat:**

* Ping interval: 60 seconds (respond with pong)


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