Indicators›Cycle›Dominant Cycle Period

GET/indicator/ht_dcperiod

Hilbert Transform – Dominant Cycle Period

Category: Cycle · Updated November 2026

The TAAPI.IO Dominant Cycle Period API returns real-time and historical values for the Hilbert Transform – Dominant Cycle Period indicator as JSON, for crypto pairs and US stocks. Send an exchange, symbol and timeframe to get real-time or historical data, with no candles to download and no calculations to maintain.

Spec	Value
Endpoint	`GET https://v2.taapi.io/indicator/ht_dcperiod`
Outputs	`value`
Markets	Binance, Binance Futures, Bybit, Gate.io, Kraken and US stocks
Timeframes	`1m` to `1w`
Delivery	REST, bulk and WebSocket

Get Dominant Cycle Period with one API call

This request returns Dominant Cycle Period for BTCUSDT on 1-hour Binance candles. Add your API key to run it here.

curl -G https://v2.taapi.io/indicator/ht_dcperiod \
  -H "Authorization: Bearer YOUR_API_KEY" \
  --data-urlencode "exchange=binance" \
  --data-urlencode "symbol=BTCUSDT" \
  --data-urlencode "timeframe=1h"

import requests

resp = requests.get(
    'https://v2.taapi.io/indicator/ht_dcperiod',
    headers={'Authorization': 'Bearer YOUR_API_KEY'},
    params={'exchange': 'binance', 'symbol': 'BTCUSDT', 'timeframe': '1h'},
)
print(resp.json())

const params = new URLSearchParams({"exchange": "binance", "symbol": "BTCUSDT", "timeframe": "1h"});
const res = await fetch(`https://v2.taapi.io/indicator/ht_dcperiod?${params}`, {
  headers: { Authorization: 'Bearer YOUR_API_KEY' },
});
console.log(await res.json());

Dominant Cycle Period API response

This response came from the live API on 9 November 2026. Long lists are shortened here.

200 OK

{
  "value": [28.278050972705785],
  "timestamp": [1794218400]
}

Field	Type	Description
`value`	number[]	Dominant Cycle Period result
`timestamp`	integer[]	Unix time of each candle, in seconds

Dominant Cycle Period API parameters

Name	Type	Required	Default	Description
`exchange`	string	Yes	—	`binance`, `binancefutures`, `bybit`, `gateio`, `kraken` or `stocks`
`symbol`	string	Yes	—	Pair or ticker, e.g. `BTCUSDT` or `AAPL`
`timeframe`	string	Yes	—	`1m` `5m` `15m` `1h` `4h` `1d` `1w`
`results`	integer	No	1	Number of values to return, or `max`
`backtrack`	integer	No	0	Candles to skip from the most recent

What is Dominant Cycle Period?

Part of John Ehlers' Hilbert Transform toolkit, this endpoint estimates the length, in candles, of the dominant market cycle at each point. The result can be used to set other indicators' periods dynamically.

Dominant Cycle Period formula

Output	Calculation
Period	Estimated from the rate of phase change of the Hilbert Transform output

How to read Dominant Cycle Period in your code

Signal	Meaning	Condition
Cycle length	Current dominant cycle in candles	`value`
Adaptive period	Feed into another indicator	Use a share of `value`, such as half, as its period

Limitations: It is an estimate that needs a long warm-up and becomes unreliable during strong trends. Nothing on this page is financial advice.

Compare the last two closed Dominant Cycle Period values

Use backtrack=1 to skip the candle still forming, and results=2 to compare the last two closed candles. Arrays run oldest first.

curl -G https://v2.taapi.io/indicator/ht_dcperiod \
  -H "Authorization: Bearer YOUR_API_KEY" \
  --data-urlencode "exchange=binance" \
  --data-urlencode "symbol=BTCUSDT" \
  --data-urlencode "timeframe=1h" \
  --data-urlencode "results=2" \
  --data-urlencode "backtrack=1"

import requests

resp = requests.get(
    'https://v2.taapi.io/indicator/ht_dcperiod',
    headers={'Authorization': 'Bearer YOUR_API_KEY'},
    params={'exchange': 'binance', 'symbol': 'BTCUSDT', 'timeframe': '1h', 'results': 2, 'backtrack': 1},
)
data = resp.json()
prev, last = data['value']
print('value', prev, '->', last)
print('rising' if last > prev else 'falling or flat')

Get historical Dominant Cycle Period values

Add results to return a series for backtesting or charting. The last element is the most recent candle.

curl -G https://v2.taapi.io/indicator/ht_dcperiod \
  -H "Authorization: Bearer YOUR_API_KEY" \
  --data-urlencode "exchange=binance" \
  --data-urlencode "symbol=BTCUSDT" \
  --data-urlencode "timeframe=1h" \
  --data-urlencode "results=100"

Get Dominant Cycle Period for multiple symbols

Combine Dominant Cycle Period with other indicators in one request. Each exchange, symbol and timeframe combination is one construct: Basic allows 1 per request, Pro 3 and Expert 10.

POST/bulk

curl -X POST https://v2.taapi.io/bulk \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "constructs": [
    {
      "id": "btc_1h",
      "exchange": "binance",
      "symbol": "BTCUSDT",
      "timeframe": "1h",
      "indicators": [
        {
          "id": "ht_dcperiod",
          "indicator": "ht_dcperiod"
        },
        {
          "id": "rsi",
          "indicator": "rsi"
        }
      ]
    }
  ]
}'

Stream Dominant Cycle Period in real time

Subscribe over WebSocket to receive new values every 5 seconds while the candle is forming. Streaming supports 1m, 5m, 15m and 1h, and uses interval where REST uses timeframe.

WSSwss://v2.taapi.io/streaming

{
  "type": "subscribe",
  "id": "ht_dcperiod",
  "exchange": "binance",
  "symbol": "BTCUSDT",
  "interval": "1m",
  "indicator": "ht_dcperiod"
}

Dominant Cycle Period API FAQ

What does the Dominant Cycle Period API return?

It returns value, plus a timestamp for the request. Results are JSON.

Is the latest Dominant Cycle Period value final?

No. The newest value belongs to the candle still forming and can change until it closes. Add backtrack=1 to read the last closed candle.

Can I get Dominant Cycle Period for US stocks?

Yes. Use exchange=stocks with a ticker such as AAPL. US stocks are included on the Pro plan and above.

See the full list of indicators, or start for free.