Stochastic Momentum Index
Category: Trend · Updated November 2026
The TAAPI.IO Stochastic Momentum Index API returns value, signal values for the Stochastic Momentum Index 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/smi |
| Outputs | value, signal |
| Markets | Binance, Binance Futures, Bybit, Gate.io, Kraken and US stocks |
| Timeframes | 1m to 1w |
| Delivery | REST, bulk and WebSocket |
Get Stochastic Momentum Index with one API call
This request returns Stochastic Momentum Index for BTCUSDT on 1-hour Binance candles. Add your API key to run it here.
curl -G https://v2.taapi.io/indicator/smi \ -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/smi',
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/smi?${params}`, {
headers: { Authorization: 'Bearer YOUR_API_KEY' },
});
console.log(await res.json());Stochastic Momentum Index API response
This response came from the live API on 9 November 2026. Long lists are shortened here.
{
"value": [-40.999767289678125],
"signal": [-34.03972638301535],
"timestamp": [1794218400]
}| Field | Type | Description |
|---|---|---|
value | number[] | Value |
signal | number[] | Signal |
timestamp | integer[] | Unix time of each candle, in seconds |
Stochastic Momentum Index 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 |
percentageKLength | integer | No | 10 | Percentage klength |
percentageDLength | integer | No | 3 | Percentage dlength |
emaLength | integer | No | 3 | Ema length |
results | integer | No | 1 | Number of values to return, or max |
backtrack | integer | No | 0 | Candles to skip from the most recent |
What is Stochastic Momentum Index?
The Stochastic Momentum Index, from William Blau, measures where the close sits relative to the midpoint of the range, rather than its low. That gives a scale centred on zero that is smoother than the classic stochastic.
Stochastic Momentum Index formula
| Output | Calculation |
|---|---|
| Distance | Close − midpoint of the range |
| SMI | 100 × double-smoothed distance ÷ (double-smoothed range ÷ 2) |
How to read Stochastic Momentum Index in your code
| Signal | Meaning | Condition |
|---|---|---|
| Overbought | Close far above midpoint | value above 40 |
| Oversold | Close far below midpoint | value below −40 |
| Crossover | Momentum shift | value crosses signal |
Limitations: The ±40 levels are conventions and change with the settings. Nothing on this page is financial advice.
Compare the last two closed Stochastic Momentum Index 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/smi \ -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/smi',
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 Stochastic Momentum Index 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/smi \ -H "Authorization: Bearer YOUR_API_KEY" \ --data-urlencode "exchange=binance" \ --data-urlencode "symbol=BTCUSDT" \ --data-urlencode "timeframe=1h" \ --data-urlencode "results=100"
Get Stochastic Momentum Index for multiple symbols
Combine Stochastic Momentum Index 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.
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": "smi",
"indicator": "smi"
},
{
"id": "rsi",
"indicator": "rsi"
}
]
}
]
}'Stream Stochastic Momentum Index 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.
{
"type": "subscribe",
"id": "smi",
"exchange": "binance",
"symbol": "BTCUSDT",
"interval": "1m",
"indicator": "smi"
}Stochastic Momentum Index API FAQ
What does the Stochastic Momentum Index API return?
It returns value, signal, plus a timestamp for the request. Results are JSON.
Is the latest Stochastic Momentum Index 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.
Which Stochastic Momentum Index settings can I change?
You can set percentageKLength, percentageDLength, emaLength. See the parameters table above for defaults.
Can I get Stochastic Momentum Index for US stocks?
Yes. Use exchange=stocks with a ticker such as AAPL. US stocks are included on the Pro plan and above.
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