Perps collateral gating and price fixes

packages/perps-controller/CHANGELOG.md

@@ -10,6 +10,27 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - Bump `@metamask/account-tree-controller` from `^7.5.3` to `7.5.4` ([#9429](https://github.com/MetaMask/core/pull/9429))
+- Gate HIP-3 markets to USDC collateral only, following HyperLiquid's USDH sunset (TAT-3304)
+  - Market discovery (`getMarkets`) now filters a HIP-3 DEX out entirely when its collateral token positively resolves to something other than USDC, so such a market can never be surfaced to trade, even via an allowlist entry naming the DEX.
+  - Placing an order on a non-USDC-collateral HIP-3 DEX now fails immediately with a new `UNSUPPORTED_COLLATERAL` error code instead of attempting the previous USDC→USDH auto-swap path.
+  - The collateral check fails open (treats the DEX as USDC-collateral) when the collateral token can't be resolved against spot metadata, so incomplete metadata doesn't spuriously block an otherwise-valid market.
+  - Removed the now-unreachable USDH auto-swap machinery this replaces (spot USDH/USDC balance lookups, the USDC→USDH spot swap, and the auto-swap orchestration).
+- Subscribe to HyperLiquid's `fastAssetCtxs` WebSocket feed for mark/mid price updates, replacing `assetCtxs` as the latency-sensitive price source now that HyperLiquid has slowed the public `assetCtxs` feed cadence
+  - `assetCtxs` continues to populate funding, open interest, volume, and oracle price data, and remains the price source for any symbol `fastAssetCtxs` doesn't cover.
+  - `fastAssetCtxs` is a single global subscription (the HyperLiquid SDK exposes no per-DEX variant): the first message is a full snapshot keyed by coin, and later messages contain diffs for only the coins that changed. Coins without an active price subscriber are ignored.
+  - Established alongside the global `allMids` subscription, restored together on WebSocket reconnect, and torn down on `clearAll()`. Subscribe attempts use the same 3-attempt/500ms-backoff retry as `assetCtxs` for transient SDK errors.
+
+### Removed
+
+- **BREAKING:** Remove the `USDH_CONFIG` export, following HyperLiquid's USDH sunset (TAT-3304)
+  - This constant configured the now-removed USDC→USDH auto-swap path; consumers importing it should remove the reference, as USDH-collateral HIP-3 DEXs are no longer supported (see the collateral gating change above).
+
+### Fixed
+
+- Scope `#notifyAllPriceSubscribers` to the symbols that actually changed, instead of always fanning out to every price subscriber
+  - The `allMids` handler now tracks a per-symbol `changedSymbols` set (replacing the previous all-or-nothing `hasUpdates` boolean) and only notifies subscribers of symbols whose price changed.
+  - The `activeAssetCtx` handler now notifies only the subscribers of the symbol it just updated, instead of re-notifying every subscribed symbol on each tick.
+  - This eliminates redundant reference-equal `PriceUpdate` deliveries to list-view subscribers (e.g. market overview, watchlist) whenever an unrelated symbol's fast-stream price ticks.
 
 ## [9.2.1]
 

packages/perps-controller/src/constants/hyperLiquidConfig.ts

@@ -649,24 +649,6 @@ export const HIP3_MARGIN_CONFIG = {
   RebalanceMinThreshold: 0.1,
 } as const;
 
-/**
- * Configuration for USDH collateral handling on HIP-3 DEXs
- * Per HyperLiquid docs: USDH DEXs pull collateral from spot balance automatically
- *
- * USDH is HyperLiquid's native stablecoin pegged 1:1 to USDC
- */
-export const USDH_CONFIG = {
-  /** Token name for USDH collateral */
-  TokenName: 'USDH',
-
-  /**
-   * Maximum slippage for USDC→USDH spot swap in basis points
-   * USDH is pegged 1:1 to USDC so slippage should be minimal
-   * 10 bps (0.1%) provides small buffer for spread
-   */
-  SwapSlippageBps: 10,
-} as const;
-
 // Progress bar constants
 export const INITIAL_AMOUNT_UI_PROGRESS = 10;
 export const WITHDRAWAL_PROGRESS_STAGES = [

packages/perps-controller/src/index.ts

@@ -385,7 +385,6 @@ export {
   TESTNET_HIP3_CONFIG,
   MAINNET_HIP3_CONFIG,
   HIP3_MARGIN_CONFIG,
-  USDH_CONFIG,
   INITIAL_AMOUNT_UI_PROGRESS,
   WITHDRAWAL_PROGRESS_STAGES,
   PROGRESS_BAR_COMPLETION_DELAY_MS,

packages/perps-controller/src/perpsErrorCodes.ts

@@ -56,6 +56,8 @@ export const PERPS_ERROR_CODES = {
   SWAP_FAILED: 'SWAP_FAILED',
   SPOT_PAIR_NOT_FOUND: 'SPOT_PAIR_NOT_FOUND',
   PRICE_UNAVAILABLE: 'PRICE_UNAVAILABLE',
+  // Market/collateral errors
+  UNSUPPORTED_COLLATERAL: 'UNSUPPORTED_COLLATERAL', // DEX collateral token is not USDC (TAT-3304)
   // Batch operation errors
   BATCH_CANCEL_FAILED: 'BATCH_CANCEL_FAILED',
   BATCH_CLOSE_FAILED: 'BATCH_CLOSE_FAILED',