Market Data API

Endpoint: wss://dgw.helixic.io

Overview.

All market data messages are delivered on subscriptions via a web socket. The instrument reference data messages are delivered as a query reply. A subscription key consists of a stream (message type) and a symbol's pattern, which supports the “” wildcard (BTCUSDT, BTC, “*”, etc). The wildcard allows to subscribe for a range of instruments by a single subscription key. All message timestamps have the nanoseconds resolution. All active client's subscriptions are cancelled on a client's web socket disconnection. The web socket server sends a ping frame every 10 seconds. If the web socket server does not receive a pong frame within 30 seconds, the web socket connection is closed. The unsolicited pong frames are allowed. For the instrument reference data subscription normally only in a single reply is sent.

Subscription request.

A subscription request can send only a single subscription key.

Examples:

{
  "msg" : "Subscription",
  "ts" : 1669032206385873,
  "seqn" : 177,
  "op" : "sub",
  "reqId" : 1,
  "stream" : "BestBidAsk",
  "pattern" : "BTC*"
}

{
  "msg" : "Subscription",
  "ts" : 1669032206385873,
  "seqn" : 177,
  "op" : "unsub",
  "stream" : "OrderbookSnapshot",
  "pattern" : "BTC*",
  "depth" : 10
}

Name	Type	Mandatory	Description
msg	string	Y	Message type: “Subscription”
ts	timestamp [usec]	Y	Client's timestamp (microseconds)
seqn	int64	Y	Client's sequence number (max: 16 digits)
op	string	Y	Operation: “sub”, “unsub”
reqId	int32	N	Subscription request id
stream	string	Y	Stream name
pattern	string	Y	Symbol's pattern
interval	int32	N	Interval (Kline subscription only), available intervals [sec]: 1, 60, 300, 900, 1800, 3600, 14400, 86400
depth	int32	N	Order book snapshot depth (OrderbookSnapshot subscription only): 5, 10, 20

Subscription reply.

A subscription reply may indicate the success or error.

Examples:

{
  "msg" : "SubscriptionReply",
  "ts" : 1669032206385873,
  "seqn" : 277,
  "reqId" : 1,
  "op" : "sub",
  "stream" : "OrderbookSnapshot",
  "pattern" : "BTCU*",
  "depth" : 20,
  "result" : "success”
}

{
  "msg" : "SubscriptionReply",
  "ts" : 1669032206385873,
  "seqn" : 277,
  "op" : "unsub",
  "stream" : "Kline",
  "pattern" : "BTCUS",
  "interval" : 3600,
  "result" : "error",
  "errCode" : 48,
  "errMessage" : "Invalid subscription: pattern=BTCUS"
}

Name	Type	Mandatory	Description
msg	string	Y	Message type: “SubscriptionReply”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
op	string	Y	Operation: “sub”, “unsub”
reqId	int32	N	Subscription request id
pattern	string	Y	Symbol's pattern
interval	int32	N	Interval (Kline subscription only), available intervals [sec]: 1, 60, 300, 900, 1800, 3600, 14400, 86400
depth	int32	N	Order book snapshot depth (OrderbookSnapshot subscription only): 5, 10, 20
status	string	Y	Operation status: “success”, “error”
errCode	int32	N	Error code
errMessage	string	N	Error message

Best bid/ask message.

This is a snapshot message. Missing bid/ask side indicates a single sided book.

Examples:

{
  "msg" : "BestBidAsk",
  "ts" : 1669026845496043,
  "streamSeqn" : 10167,
  "seqn" : 16716,
  "symbol" : "BTCUSDT",
  "bidPrice" : "17567.34",
  "bidQty" : "5.76345",
  "askPrice" : "17567.44",
  "askQty" : "4.18456"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “BestBidAsk”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
symbol	string	Y	Symbol
bidPrice	price	N	Best bid price
bidQty	quantity	N	Best bid quantity
askPrice	price	N	Best ask price
askQty	quantity	N	Best ask quantity

Trade message.

Individual trade tick message.

Example:

{
  "msg" : "Trade",
  "ts" : 1669030387918824,
  "streamSeqn" : 170167,
  "seqn" : 180444,
  "symbol" : "BTCUSDT",
  "tradeId" : "6690303879188244",
  "tradePrice" : "17567.34",
  "tradeQty" : "1.23978",
  "makerBuyer" : true
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “Trade”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
symbol	string	Y	Symbol
tradeId	int64	Y	Unique trade id (max: 16 digits)
tradePrice	price	Y	Trade price
tradeQty	quantity	Y	Trade quantity
makerBuyer	boolean	Y	Maker is a buyer flag

Orderbook snapshot message.

Orderbook snapshot tick message. Supported depths: 5, 10 and 20, which must be specified in the subscription request's “depth” field.

Price level snapshot value: [price, quantity, number of orders].

Examples:

{
  "msg" : "OrderbookSnapshot",
  "ts" : 1669030575242078,
  "streamSeqn" : 170167,
  "seqn" : 189282,
  "symbol" : "BTCUSDT",
  "bids" : [
    ["17567.34","2.01235",4],
    ["17567.25","1.45169",2],
    ...
    ["17239.11","0.95432",6]
  ],
  "asks" : [
    ["17567.56","6.34985",3],
    ["17567.67","1.45169",7],
    ...
    ["17611.11","0.78911",4]
  ]
}

{
  "msg" : "OrderbookSnapshot",
  "ts" : 1669030575242078,
  "streamSeqn" : 170167,
  "seqn" : 189282,
  "symbol" : "BTCUSDT",
  "bids" : [],
  "asks" : []
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “OrderbookSnapshot”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
symbol	string	Y	Symbol
bids	sequence of price levels	N	Full bid (all price levels) order book
asks	sequence of price levels	N	Full ask (all price levels) order book

Orderbook update message.

Orderbook update (delta) tick message. A snapshot message may be delivered as a sequence of updates reconstructing a whole book, which is indicated via the snapshot flag.

Price level update value: [update command (“n” (new), “c” (change), “d” (delete)), level, price, quantity, number of orders].

Examples:

{
  "msg" : "OrderbookUpdate",
  "ts" : 1669031373575253,
  "streamSeqn" : 170167,
  "seqn" : 226768,
  "symbol" : "BTCUSDT",
  "bids" : [
    ["c", 3, "17567.34","2.01235",4],
    ["d", 1, "0.","0.",0],
    ["n", 5, "17511.16","0.12",1]
  ],
  "asks" : [
    ["d", 0, "0.","0.",0],
    ["n", 2, "17614.77","1.67",1],
    ["c", 1, "17601.56","0.98",2]
  ]
}

{
  "msg" : "OrderbookUpdate",
  "ts" : 1669031373575253,
  "streamSeqn" : 170167,
  "seqn" : 226768,
  "symbol" : "BTCUSDT",
  "bids" : [],
  "asks" : [],
  "snapshot" : true
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “OrderbookUpdate”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
symbol	string	Y	Symbol
bids	sequence of price level updates	N	Bid order book updates sequence
asks	Sequence of price level updates	N	Ask order book updates sequence
snapshot	boolean	N	Bid and ask books message in a snapshot sequence
snapshotFirst	boolean	N	First snapshot message in a snapshot sequence
snapshotLast	boolean	N	Last snapshot message in a snapshot sequence

State message.

Market/instrument state message. May indicate a whole market or individual instrument state.

Examples:

{
  "msg" : "State",
  "ts" : 1669032206998413,
  "streamSeqn" : 170167,
  "seqn" : 265985,
  "marketState" : "halted"
}

{
  "msg" : "State",
  "ts" : 1669032206998413,
  "streamSeqn" : 170167,
  "seqn" : 265985,
  "symbol" : "BTCUSDT",
  "instrumentState" : "disabled"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “State”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
symbol	string	N	Symbol
marketState	market state	N	Market state
instrumentState	instrument state	N	Instrument state

Ticker message.

24 hours sliding window ticker message. The interval is 1 sec.

Example:

{
  "msg" : "Ticker",
  "ts" : 1669032206998413,
  "streamSeqn" : 170167,
  "seqn" : 265977,
  "interval" : 1,
  "symbol" : "BTCUSDT",
  "openPrice" : "20201.15",
  "lastPrice" : "20202.34",
  "highPrice" : "20205.87",
  "lowPrice" : "20199.98",
  "vwap" : "20202.78",
  "numTrades" : 53197,
  "volume" : "3909.78543",
  "quoteVolume" : "4760.48",
  "avgQty" : "0.19852",
  "lastQty" : "3.00329"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “Ticker”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
interval	int32	Y	Message generation interval [secs]
symbol	string	Y	Symbol
openPrice	price	Y	Open traded price
LastPrice	price	Y	Last/close traded price
highPrice	price	Y	Highest traded price
lowPrice	price	Y	Lowest traded price
vwap	price	Y	Volume weighed average price
numTrades	int32	Y	Number of trades
volume	quantity	Y	Total traded volume
quoteVolume	price	Y	Total traded quote volume
avgQty	quantity	N	Average traded quantity
lastQty	quantity	N	Last trades quantity

Top Trading Stats message.

24 hours sliding window top stats. The interval is 1 minute.

Example:

{
  "msg": "TopTradingStats",
  "ts": 1684416420000000,
  "streamSeqn": 6,
  "seqn": 7,
  "topGainerSymbol": "BTCUSDC",
  "topGainerRelative": "1.3",
  "topLoserSymbol": "ETHUSDC",
  "topLoserRelative": "-0.5",
  "symbol": "BTCUSDC",
  "volume": "100.0"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “TopTradingStats”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
topGainerSymbol	string	Y	Best relative increase symbol
topGainerRelative	relation	Y	Best relative increase value
topLoserSymbol	string	Y	Worst relative increase symbol
topLoserRelative	relation	Y	Worst relative increase value
symbol	string	Y	Symbol for top volume
volume	quantity	Y	Top volume, traded in USD

Kline/candlestick message.

Supported intervals: 1 sec, 1 min, 5 mins, 15 mins, 30 mins, 1 hour, 4 hours and 1 day, which must be specified in the subscription request's "interval" field.

Example:

{
  "msg" : "Kline",
  "ts" : 1669032206998413,
  "streamSeqn" : 170167,
  "seqn" : 265977,
  "startTs" : 1669032206000000,
  "endTs" :   1669032207000000,
  "interval" : 60,
  "symbol" : "BTCUSDT",
  "openPrice" : "20201.15",
  "lastPrice" : "20202.34",
  "highPrice" : "20205.87",
  "lowPrice" : "20199.98",
  "numTrades" : 53197,
  "volume" : "3909.78543",
  "quoteVolume" : "4760.48"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “Kline”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
startTs	timestamp [usec]	Y	Start of interval timestamp (microseconds)
endTs	timestamp [usec]	Y	End of interval timestamp (microseconds)
interval	int32	Y	Interval [secs]
symbol	string	Y	Symbol
openPrice	price	N	Open traded price
LastPrice	price	N	Last/close traded price
highPrice	price	N	Highest traded price
lowPrice	price	N	Lowest traded price
numTrades	int32	N	Number of trades
volume	quantity	N	Total traded volume
quoteVolume	price	N	Total traded quote volume

TotalValueLocked message.

Total value locked message is sent each 5 minutes. It's calculated as deposited-assets - withdrawn-assets. If no withdrawals happened during last 5 minutes, update won't be sent.

Example:

{
  "msg" : "TotalValueLocked",
  "ts" : 1669032206998413,
  "streamSeqn" : 170167,
  "seqn" : 265977,
  "asset" : "BTC",
  "volume" : "2.53747423",
  "volumeNotional" : "110160.12998926"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “TotalValueLocked”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
streamSeqn	int64	N	Market data stream sequence number (max: 16 digits)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
asset	string	Y	Asset short name
volume	quantity	N	Total asset volume in trading engine
volumeNotional	price	N	Total asset volume in USD based on last traded price

Kline/candlestick query.

Supported intervals: 1 sec, 1 min, 5 mins, 15 mins, 30 mins, 1 hour, 4 hours and 1 day.

Example:

{
  "msg" : "KlineQuery",
  "ts" : 1669032206998413,
  "seqn" : 177,
  "startTs" : 1669032206000000,
  "endTs" :   1669032207000000,
  "interval" : 60,
  "symbol" : "BTCUSDT",
  "limit" : 600
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “KlineQuery”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Client's sequence number (max: 16 digits)
startTs	timestamp [usec]	Y	Start of interval timestamp (microseconds)
endTs	timestamp [usec]	N	End of interval timestamp (microseconds)
interval	int32	Y	Interval [secs]
symbol	string	Y	Symbol
limit	int32	N	Max number of replies. Max=1000, default=500

Kline/candlestick query reply.

Supported intervals: 1 sec, 1 min, 5 mins, 15 mins, 30 mins, 1 hour, 4 hours and 1 day.

Example:

{
  "msg" : "KlineQueryReply",
  "ts" : 1669031373575253,
  "seqn" : 277,
  "symbol" : "BTCUSDT",
  "interval" : 60,
  "startTs" : 1618930720000000,
  "endTs" : 1618930730000000,
  "limit" : 100,
  "klines" : [
    {
      "startTs" : 1669032206000000,
      "endTs" :   1669032207000000,
      "openPrice" : "20201.15",
      "lastPrice" : "20202.34",
      "highPrice" : "20205.87",
      "lowPrice" : "20199.98",
      "numTrades" : 53197,
      "volume" : "3909.78543",
      "quoteVolume" : "4760.48"
    },
    ...
    {
      ...
    }
  ]
}

{
  "msg" : "KlineQueryReply",
  "ts" : 1618930734676777,
  "seqn" : 277,
  "symbol" : "BTCUSDT",
  "interval" : 60,
  "startTs" : 1618930720000000,
  "endTs" : 1618930730000000,
  "limit" : 100,
  "errCode": 91,
  "errMessage": "Undefined instrument: no symbol matches pattern"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “KlineQueryReply”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
startTs	timestamp [usec]	Y	Start of interval timestamp (microseconds)
endTs	timestamp [usec]	N	End of interval timestamp (microseconds)
interval	int32	Y	Interval [secs]
symbol	string	Y	Symbol
limit	int32	N	Max number of replies. Max=1000, default=500
klines	array of “Kline”	N	Array of “Kline” messages. The “ts”, “symbol” and “interval” are not provided in an individual elements of array, because they are equal to the corresponding message values
errCode	int32	N	Error code
errMessage	string	N	Error message

Last Traded Price query.

Example:

{
  "msg" : "LastTradedPriceQuery",
  "ts" : 1687166942000000,
  "seqn" : 1,
  "pattern" : "BTCUSDC"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: LastTradedPriceQuery
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Client's sequence number (max: 16 digits)
pattern	string	Y	Symbol
includeDisabled	boolean	N	Include disabled instruments, False by default.

Last Traded Price query reply.

Example:

{
  "msg" : "LastTradedPriceQueryReply",
  "ts" : 1669031373575253,
  "seqn" : 277,
  "ltps":[["HTDNAUSDC","0.1"],["BNBUSDC","312.6"],["MATICUSDC","0.8623"],
    ["UNIUSDC","5.137"],["ETHUSDC","1820.86"],["HTICPUSDC","5.273"],
    ["SHIBUSDC","0.00000883"],["HTCKBTCBTC","1.0"],["HTCKBTCUSDC","26981.69"],
    ["BTCUSDC","35000.0"]]
}

{
  "msg":"LastTradedPriceQueryReply",
  "ts":1701811711767566,
  "seqn":3,
  "ltps":[["BTCUSDC","50000.0"]]
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: LastTradedPriceQueryReply
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
ltps	array of ltps	N	Array of ltp messages. LTP message is a pair [symbol, price]
errCode	int32	N	Error code
errMessage	string	N	Error message

Trade query.

Example:

{
  "msg" : "TradeQuery",
  "startTs" : 1704964200003000,
  "symbol" : "BTCUSDC",
  "ts" : 1704967801006000,
  "seqn" : 7
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: TradeQuery
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Client's sequence number (max: 16 digits)
symbol	string	Y	Symbol
startTs	timestamp [usec]	N	Start of interval timestamp (microseconds)
endTs	timestamp [usec]	N	End of interval timestamp (microseconds)
limit	int32	N	Max number of trades. Max=1000, default=500

Trade query reply.

Example:

{
  "msg":"TradeQueryReply",
  "ts":1704967801006000,
  "seqn":3,
  "symbol":"BTCUSDC",
  "limit":2,
  "trades":[
    {"msg":"Trade","ts":1704816146215083,"symbol":"BTCUSDC","tradeId":"7048161462150829","tradePrice":"61964.0","tradeQty":"0.00008","makerBuyer":true},
    {"msg":"Trade","ts":1704816146215083,"symbol":"BTCUSDC","tradeId":"7048161462150830","tradePrice":"61964.0","tradeQty":"0.00006","makerBuyer":true}
  ]
}

{
  "msg":"TradeQueryReply",
  "ts":1704967801006000,
  "seqn":1,
  "symbol":"ICPUSDC",
  "startTs":1704964200003000,
  "errCode":59,
  "errMessage":"Invalid query: invalid symbol=ICPUSDC"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: TradeQueryReply
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
trades	array of trades	N	Array of trade messages
startTs	timestamp [usec]	N	Start of interval timestamp (microseconds)
endTs	timestamp [usec]	N	End of interval timestamp (microseconds)
limit	int32	N	Max number of trades. Max=1000, default=500
errCode	int32	N	Error code
errMessage	string	N	Error message

Instruments reference data request.

Provides reference/static data for all instruments.

Example:

{
  "msg": "Symbols",
  "ts": 1670341183180611,
  "seqn" : 177,
  "pattern": "BTC*"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “Symbols”
ts	timestamp [usec]	Y	Client's timestamp (microseconds)
seqn	int64	Y	Client's sequence number (max: 16 digits)
pattern	strings	Y	Symbol's pattern
includeDisabled	boolean	N	Include disabled instruments, False by default.

Instruments reference data reply.

Provides reference/static data for all instruments.

Examples:

{
  "msg": "SymbolsReply",
  "ts": 1670350617040913,
  "seqn" : 277,
  "pattern" : "BTC*",
  "symbols": [
    {
      "symbol": "BTCUSDT",
      "base": "BTC",
      "quote": "USDT",
      "tickSize": "0.01",
      "lotSize": "0.00001",
      "minNotional": "10.0",
      "minQty": "0.00001",
      "maxQty": "100000.0",
      "maxOrders": 200,
      "type": "spot"
    }
  ]
}

{
  "msg": "SymbolsReply",
  "ts": 1670350617040913,
  "seqn" : 277,
  "pattern" : "BU*",
  "errCode": 91,
  "errMessage": "Undefined instrument: no symbol matches pattern"
}

Name	Type	Mandatory	Description
msg	string	Y	Message name: “SymbolsReply”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
pattern	strings	Y	Symbol's pattern
base	string	Y	Base asset
quote	string	Y	Quote asset
tickSize	double	Y	Tick size
lotSize	double	Y	Lot size
minNotional	price	Y	Min order notional value
maxQty	quantity	Y	Max order quantity
minQty	quantity	Y	Min order quantity
maxOrders	int32	Y	Max open orders for a client
type	instrument type	Y	Instrument type
errCode	int32	N	Error code
errMessage	string	N	Error message
enabled	boolean	N	Field not presented for querying only enabled instruments

Error message.

Examples:

{
  "msg" : "Error",
  "ts" : 1618930734676777,
  "seqn" : 277,
  "errCode": 46,
  "errMessage": "Missing mandatory field: symbol",
  "refMsg" : "KlineQuery",
  "refSeqn" : 177
}

Name	Type	Mandatory	Description
msg	string	Y	Message type: “Error”
ts	timestamp [usec]	Y	Message generation timestamp (microseconds)
seqn	int64	Y	Exchange sequence number (max: 16 digits)
errCode	int32	N	Error code
errMessage	string	N	Error message
refMsg	string	N	Referenced message type
refSeqn	int64	N	Referenced client's sequence number (max: 16 digits)

Types.

price: double rounded by tick size and converted to string ("33.65")
quantity: double rounded by lot size and converted to string ("197.")
price level: tuple of price, quantity, number of orders
price level update: tuple of command: new(“n”), delete(“d”), change(“c”), level, price, quantity, number of orders), value
timestamp: time since epoch in microseconds (1669032206998414)
int64: limited by 16 digits

Instrument type (as string).

spot

Market state (as string).

halted
open
closed

Instrument state (as string).

enabled
disabled

Errors

This error section is stored in a separate file in includes/_errors.md. Slate allows you to optionally separate out your docs into many files...just save them to the includes folder and add them to the top of your index.md's frontmatter. Files are included in the order listed.

The Kittn API uses the following error codes:

Error Code	Meaning
400	Bad Request -- Your request is invalid.
401	Unauthorized -- Your API key is wrong.
403	Forbidden -- The kitten requested is hidden for administrators only.
404	Not Found -- The specified kitten could not be found.
405	Method Not Allowed -- You tried to access a kitten with an invalid method.
406	Not Acceptable -- You requested a format that isn't json.
410	Gone -- The kitten requested has been removed from our servers.
418	I'm a teapot.
429	Too Many Requests -- You're requesting too many kittens! Slow down!
500	Internal Server Error -- We had a problem with our server. Try again later.
503	Service Unavailable -- We're temporarily offline for maintenance. Please try again later.