Hyperliquid API reference (desk edition)

Verified against the official docs on 2026-08-16. When in doubt, fetch the page: append .md to any docs URL for raw markdown, for example https://hyperliquid.gitbook.io/hyperliquid-docs/for-developers/api/exchange-endpoint.md.

Endpoints

	Mainnet	Testnet
REST	https://api.hyperliquid.xyz	https://api.hyperliquid-testnet.xyz
WebSocket	wss://api.hyperliquid.xyz/ws	wss://api.hyperliquid-testnet.xyz/ws
HyperEVM RPC	https://rpc.hyperliquid.xyz/evm (chain 999)	https://rpc.hyperliquid-testnet.xyz/evm (chain 998)

• POST /info body {"type": "<request>", ...}, unsigned; response is the bare payload. Unknown type or missing field: HTTP 422; invalid JSON: HTTP 400.
• POST /exchange body {"action": {...}, "nonce": <ms>, "signature": {"r","s","v"}, "vaultAddress"?: "0x...", "expiresAfter"?: <ms>}; response {"status":"ok","response":{"type":"order"|"cancel"|"default"|..., "data"?: {...}}} or {"status":"err","response":"<string>"}, both HTTP 200.
• Header Content-Type: application/json.

/info request types

type	params	returns
allMids	dex?	{coin: midPx}
meta	dex?	{universe:[{name, szDecimals, maxLeverage, marginTableId?, onlyIsolated?, marginMode?, isDelisted?}], marginTables:[[id,{description, marginTiers:[{lowerBound, maxLeverage}]}]]}
metaAndAssetCtxs	dex?	[meta, [{funding, openInterest, prevDayPx, dayNtlVlm, premium, oraclePx, markPx, midPx, impactPxs}]]
spotMeta		{tokens:[{name, szDecimals, weiDecimals, index, tokenId, ...}], universe:[{name, tokens:[base,quote], index}]}
spotMetaAndAssetCtxs		[spotMeta, [{dayNtlVlm, markPx, midPx, prevDayPx, circulatingSupply}]]
l2Book	coin, nSigFigs? (2-5), mantissa? (1,2,5)	{coin, time, levels:[[{px,sz,n}...bids],[...asks]]} up to 20 a side
recentTrades	coin	[{coin, side, px, sz, time, hash, tid}]
candleSnapshot	req:{coin, interval, startTime, endTime}	[{t,T,s,i,o,c,h,l,v,n}], most recent 5000 only
fundingHistory	coin, startTime, endTime?	[{coin, fundingRate (hourly), premium, time}]
predictedFundings		[[coin, [[venue, {fundingRate, nextFundingTime, fundingIntervalHours?}]]]]; venue is HlPerp, BinPerp or BybitPerp, payload null when unlisted there. Normalise by fundingIntervalHours (HlPerp 1; CEX venues 4 or 8 per coin), never by a fixed 8
perpsAtOpenInterestCap	dex?	[coin]
perpDexs		[null, {name, fullName, deployer, ...}]
clearinghouseState	user, dex?	{assetPositions:[{type, position:{coin, szi, entryPx, leverage{type,value,rawUsd?}, liquidationPx, marginUsed, positionValue, unrealizedPnl, returnOnEquity, cumFunding, maxLeverage}}], marginSummary{accountValue,totalNtlPos,totalRawUsd,totalMarginUsed}, crossMarginSummary, crossMaintenanceMarginUsed, withdrawable, time}
spotClearinghouseState	user	{balances:[{coin, token, hold, total, entryNtl}]}
openOrders	user, dex?	[{coin, side (A/B), limitPx, sz, oid, timestamp}]
frontendOpenOrders	user, dex?	adds origSz, cloid, orderType, tif, reduceOnly, isTrigger, triggerPx, triggerCondition, isPositionTpsl, children
orderStatus	user, oid (number or cloid hex)	{status:"order", order:{order, status, statusTimestamp}} or {status:"unknownOid"}
historicalOrders	user	[{order, status, statusTimestamp}] up to 2000
userFills	user, aggregateByTime?	[{coin, px, sz, side, time, startPosition, dir, closedPnl, hash, oid, crossed, fee, feeToken, builderFee?, tid, cloid?}] up to 2000
userFillsByTime	user, startTime, endTime?, aggregateByTime?	same, up to 2000 per call from the last 10000
userFunding	user, startTime, endTime?	[{time, hash, delta:{type:"funding", coin, usdc, szi, fundingRate, nSamples}}]
userNonFundingLedgerUpdates	user, startTime, endTime?	deposits, withdrawals, transfers, liquidations, vault flows
userTwapSliceFills	user	[{fill, twapId}]
portfolio	user	[["day",{accountValueHistory, pnlHistory, vlm}], ["week",...], ["month",...], ["allTime",...], perp variants]
userFees	user	{userCrossRate, userAddRate, userSpotCrossRate, userSpotAddRate, feeSchedule, activeReferralDiscount, activeStakingDiscount}
userRateLimit	user	{cumVlm, nRequestsUsed, nRequestsCap, nRequestsSurplus}
userRole	user	`{role: missing
extraAgents	user	[{address, name, validUntil}]
activeAssetData	user, coin	{leverage, maxTradeSzs:[buy,sell], availableToTrade:[buy,sell], markPx}
maxBuilderFee	user, builder	integer (tenths of a bp)
subAccounts	user	[{name, subAccountUser, master, clearinghouseState, spotState}]
vaultDetails	vaultAddress, user?	vault info
userVaultEquities	user	[{vaultAddress, equity}]
referral, delegations, delegatorSummary, delegatorHistory, delegatorRewards, userAbstraction, borrowLendUserState, tokenDetails, spotDeployState, perpDexLimits, allPerpMetas		niche; see docs

Pagination for time-ranged reads: 500 items per response for ledger/funding style queries; use the last time as the next startTime.

/exchange actions

L1-signed actions can be signed by an API wallet; user-signed actions need the account's main wallet (the desk never has it).

action	params	scheme	desk
order	`orders:[{a,b,p,s,r,t,c?}], grouping: na	normalTpsl	positionTpsl, builder?`
cancel	cancels:[{a,o}], f? (fast, omit if false)	L1	yes
cancelByCloid	cancels:[{asset, cloid}]	L1	yes
modify / batchModify	oid (or cloid), order:{...} / modifies:[{oid, order}]; without a (always_place) the new order must be non-trigger and rest (Alo or non-executable Gtc)	L1	yes, resting limits only
scheduleCancel	time? (ms >= now+5s)	L1	yes, on request
updateLeverage	asset, isCross, leverage	L1	yes
updateIsolatedMargin	asset, isBuy, ntli (USD x 1e6, negative removes)	L1	yes
twapOrder / twapCancel	twap:{a,b,s,r,m (minutes),t (randomise)} / a, t (twapId); 5 min to 7 days, min 100 USD	L1	yes, on request
noop		L1	rarely
reserveRequestWeight	weight	L1	user's call
vaultTransfer, subAccountTransfer, createSubAccount, subAccountSpotTransfer		L1	no
approveAgent	agentAddress, agentName?	user	in app
approveBuilderFee	maxFeeRate, builder	user	no
usdSend, spotSend, sendAsset, withdraw3, usdClassTransfer		user	no
cDeposit, cWithdraw, tokenDelegate, userSetAbstraction		user	no

Order fields: a asset index, b isBuy, p price string, s size string, r reduceOnly, t {"limit":{"tif":"Alo"|"Ioc"|"Gtc"}} or {"trigger":{"isMarket":bool,"triggerPx":"...","tpsl":"tp"|"sl"}}, c cloid (0x + 32 hex). Order statuses: {"resting":{"oid"}}, {"filled":{"totalSz","avgPx","oid"}}, "waitingForTrigger", "waitingForFill", {"error":"..."}. Cancel statuses: "success" or {"error":"..."}.

Order status vocabulary (orderStatus, historicalOrders, WS orderUpdates): open, filled, canceled, triggered, rejected, marginCanceled, vaultWithdrawalCanceled, openInterestCapCanceled, selfTradeCanceled, reduceOnlyCanceled, siblingFilledCanceled, delistedCanceled, liquidatedCanceled, scheduledCancel, tickRejected, minTradeNtlRejected, perpMarginRejected, reduceOnlyRejected, badAloPxRejected, iocCancelRejected, badTriggerPxRejected, marketOrderNoLiquidityRejected, positionIncreaseAtOpenInterestCapRejected, positionFlipAtOpenInterestCapRejected, tooAggressiveAtOpenInterestCapRejected, openInterestIncreaseRejected, insufficientSpotBalanceRejected, oracleRejected, perpMaxPositionRejected.

Signing (what the SDKs do for you)

• L1 actions: msgpack the action, append nonce, vault flag/address and optional expiresAfter, keccak it, sign an EIP-712 Agent {source, connectionId} under domain Exchange (chainId 1337) where source is a for mainnet and b for testnet.
• User-signed actions: EIP-712 typed data under domain HyperliquidSignTransaction with the action's hyperliquidChain (Mainnet/Testnet) and signatureChainId; the action's nonce/time must equal the outer nonce.
• Nonce: unix ms; per signer; must exceed the 100th-highest used and lie within (now - 2 days, now + 1 day).
• A bad signature surfaces as User or API Wallet 0x<recovered> does not exist., not as "bad signature".
• Addresses lowercase; numbers as strings without trailing zeros; -0 becomes 0.

Asset ids and coin names

• Perp: index in meta.universe (default dex). Read it live; never hardcode.
• Spot: 10000 + index in spotMeta.universe; coin name PURR/USDC or @<index>; size decimals from the base token.
• HIP-3 perps: 100000 + 10000 x dex index + index; name dex:COIN.
• HIP-4 outcomes: 100000000 + encoding; names #<n>.
• Ids differ between mainnet and testnet.

Tick and lot

• Price: at most 5 significant figures and at most 6 - szDecimals decimals (perps) or 8 - szDecimals (spot). Integer prices are always valid.
• Size: rounded to szDecimals. Round down on the desk.
• Minimum order value: 10 USD (perps) / 10 quote tokens (spot). Max market order value scales with max leverage (30M for 25x+, down to 500k); limit orders 10x that.
• Open orders per account: 1000 + 1 per 5M USDC volume, cap 5000; at 1000 open orders new reduce-only and trigger orders are rejected.

Rate limits

• Per IP: 1200 weight per minute across REST. /exchange weight 1 + floor(n/40). /info weight 2 for l2Book, allMids, clearinghouseState, orderStatus, spotClearinghouseState, exchangeStatus; 60 for userRole; 20 for the rest; +1 per 20 items for list queries; candleSnapshot +1 per 60 candles.
• Per address (actions): 10,000 buffer + 1 per 1 USDC cumulative volume; when exhausted, 1 action per 10 s; cancels get min(limit + 100000, 2 x limit). Stale expiresAfter rejections cost 5x. Unified/portfolio-margin accounts capped at 50k actions per day.
• WebSocket per IP: 10 connections, 30 new per minute, 1000 subscriptions, 10 distinct users, 2000 messages per minute, 100 in-flight posts.

WebSocket

{"method":"subscribe","subscription":{...}}; heartbeat {"method":"ping"} / {"channel":"pong"}; idle connections closed after 60 s. Types: allMids, notification, webData3, candle, l2Book, trades, orderUpdates, userEvents (channel "user"), userFills, userFundings, userNonFundingLedgerUpdates, activeAssetCtx, activeAssetData, userTwapSliceFills, userTwapHistory, twapStates, bbo, clearinghouseState, openOrders, spotState, allDexsClearinghouseState, allDexsAssetCtxs, fastAssetCtxs. Post /info or signed actions over the socket with {"method":"post","id":n,"request":{"type":"info"|"action","payload":{...}}}.

Error strings

Price must be divisible by tick size. | Order must have minimum value of $10. | Insufficient margin to place order. | Reduce only order would increase position. | Post only order would have immediately matched, bbo was ... | Order could not immediately match against any resting orders. | Invalid TP/SL price. | No liquidity available for market order. | Order price too far from oracle | Order would cause position to exceed margin tier limit at current leverage | Order was never placed, already canceled, or filled. | User or API Wallet 0x... does not exist. | Must deposit before performing actions. User: 0x... | Invalid TWAP duration: ...

Trading facts the desk quotes

• Funding: hourly, peer to peer, computed from an 8h formula paid 1/8 each hour, capped 4%/h, paid on oracle price; API rates are hourly.
• Mark price (median of oracle-adjusted mid, book mid and CEX perp mids) drives margining, liquidation and TP/SL triggers.
• Maintenance margin = half the initial margin at the tier's max leverage; partial liquidations first for large positions; cross liquidation price ignores the leverage setting.
• Fees: base taker 0.045% / maker 0.015% perps, 0.07% / 0.04% spot, tiered by 14-day volume, staking and referral discounts; effective rates via userFees.
• Testnet: same API; faucet at app.hyperliquid-testnet.xyz/drip (needs an address that has deposited on mainnet); much tighter margin tiers; asset ids differ.

Official pages worth fetching

for-developers/api/info-endpoint, .../info-endpoint/perpetuals, .../info-endpoint/spot, .../exchange-endpoint, .../signing, .../nonces-and-api-wallets, .../rate-limits-and-user-limits, .../tick-and-lot-size, .../asset-ids, .../error-responses, .../websocket/subscriptions, .../websocket/post-requests; trading/order-types, trading/take-profit-and-stop-loss-orders-tp-sl, trading/margining, trading/margin-tiers, trading/liquidations, trading/funding, trading/fees, trading/sub-accounts; onboarding/testnet-faucet. All under https://hyperliquid.gitbook.io/hyperliquid-docs/.