Market Facilitation Index
Category: Momentum · Updated November 2026
The TAAPI.IO Market Facilitation Index API returns real-time and historical values for the Market Facilitation 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/marketfi |
| Outputs | value |
| Markets | Binance, Binance Futures, Bybit, Gate.io, Kraken and US stocks |
| Timeframes | 1m to 1w |
| Delivery | REST, bulk and WebSocket |
Get Market Facilitation Index with one API call
This request returns Market Facilitation Index for BTCUSDT on 1-hour Binance candles. Add your API key to run it here.
curl -G https://v2.taapi.io/indicator/marketfi \ -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/marketfi',
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/marketfi?${params}`, {
headers: { Authorization: 'Bearer YOUR_API_KEY' },
});
console.log(await res.json());Market Facilitation Index API response
This response came from the live API on 9 November 2026. Long lists are shortened here.
{
"value": [0.851790555937836],
"timestamp": [1794218400]
}| Field | Type | Description |
|---|---|---|
value | number[] | Market Facilitation Index result |
timestamp | integer[] | Unix time of each candle, in seconds |
Market Facilitation 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 |
results | integer | No | 1 | Number of values to return, or max |
backtrack | integer | No | 0 | Candles to skip from the most recent |
What is Market Facilitation Index?
The Market Facilitation Index, from Bill Williams, measures how much price moved per unit of volume. It helps show how efficiently volume is moving the market.
Market Facilitation Index formula
| Output | Calculation |
|---|---|
| MFI (Williams) | (high − low) ÷ volume |
How to read Market Facilitation Index in your code
| Signal | Meaning | Condition |
|---|---|---|
| Efficient move | Price range rising versus volume | value rising |
| Inefficient move | Volume absorbed with little range | value falling |
Limitations: Values are tiny on high-volume symbols, and it must be read together with the change in volume. Nothing on this page is financial advice.
Compare the last two closed Market Facilitation 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/marketfi \ -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/marketfi',
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 Market Facilitation 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/marketfi \ -H "Authorization: Bearer YOUR_API_KEY" \ --data-urlencode "exchange=binance" \ --data-urlencode "symbol=BTCUSDT" \ --data-urlencode "timeframe=1h" \ --data-urlencode "results=100"
Get Market Facilitation Index for multiple symbols
Combine Market Facilitation 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": "marketfi",
"indicator": "marketfi"
},
{
"id": "rsi",
"indicator": "rsi"
}
]
}
]
}'Stream Market Facilitation 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": "marketfi",
"exchange": "binance",
"symbol": "BTCUSDT",
"interval": "1m",
"indicator": "marketfi"
}Market Facilitation Index API FAQ
What does the Market Facilitation Index API return?
It returns value, plus a timestamp for the request. Results are JSON.
Is the latest Market Facilitation 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.
Can I get Market Facilitation 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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