Relative Strength Index (RSI)
The Relative Strength Index (RSI) is a popular technical indicator used in financial markets to assess the momentum and strength of a price trend. We provide the best RSI API available.
Developed by J. Welles Wilder, the RSI is a momentum oscillator that measures the speed and change of price movements. It is typically applied to a price chart, oscillating between 0
and 100
, with readings above 70
considered overbought and readings below 30
indicating oversold conditions. The Relative Strength Index is calculated based on the average gains and losses over a specified period, commonly 14 days. Traders and analysts use this indicator to identify potential trend reversals, overbought or oversold conditions, and to generate signals for buying or selling assets.

Get RSI values via API
We provide API access the RSI values for all of the most popular assets like stocks, crypto (try one of the popular exchanges like Binance) and forex, on all commonly used timeframes – from the weekly and daily all the way down to one minute intervals. You can also calculate the values on your own data using our manual method.
Customise RSI Sensitivity
When using the RSI technical indicator, you have the ability to fine-tune its responsiveness by adjusting the optional period
parameter through the API. This parameter allows you to customize the number of candles considered in the RSI calculation. If you opt for a shorter period, the RSI becomes more sensitive, responding quickly to recent price changes and potentially signaling overbought or oversold conditions sooner. On the other hand, choosing a longer period smoothens the RSI’s output, offering a broader perspective on market trends. This feature lets you tailor the RSI to fit your specific trading strategies and timeframes, enhancing its effectiveness in various market conditions.
Get started for Free
The best way to access RSI is with our Pro and Expert plans.
Test drive TAAPI.IO risk-free with our 7-day free trial on all paid plans! We’re confident you’ll be hooked for the long haul!
-
Sale!
Pro
From: €14.99 / month with a 7-day free trialMost popular
- All indicators
- 30 API requests / 15 seconds
- 2400 calculations / minute
- US Stocks – real-time and historical
- Crypto data real-time and historical
- 3 symbols per API request
- Priority support
7-day Free Trial
-
Sale!
Expert
From: €24.99 / month with a 7-day free trial
- All indicators
- 75 API requests / 15 seconds
- 6000 calculations / minute
- US Stocks – real-time and historical
- Crypto data real-time and historical
- 10 symbols per API request
- Priority support
7-day Free Trial
Get started with the rsi
Simply make an HTTPS [GET] request or call in your browser:
[GET] https://api.taapi.io/rsi?secret=MY_SECRET&exchange=binance&symbol=BTC/USDT&interval=1h
The rsi
endpoint returns a JSON response like this:
{
"value": 65.73211579249397
}
Example response from TAAPI.IO when querying rsi endpoint.
API parameters
binance
, binancefutures
or one of our supported exchanges. For other crypto / stock exchanges, please refer to our Client or Manual integration methods.
BTC/USDT
Bitcoin to Tether, or LTC/BTC
Litecoin to Bitcoin...
1m
, 5m
, 15m
, 30m
, 1h
, 2h
, 4h
, 12h
, 1d
, 1w
. So if you're interested in values on hourly candles, use interval=1h
, for daily values use interval=1d
, etc.
backtrack
parameter removes candles from the data set and calculates the rsi value X amount of candles back. So, if you’re fetching the rsi on the hourly and you want to know what the rsi was 5 hours ago, set backtrack=5
. The default is 0
and a maximum is 50
.
backtracks
parameter returns the rsi value calculated on every candle for the past X candles. For example, if you want to know what the rsi was every hour for the past 12 hours, you use backtracks=12
. As a result, you will get 12 values back.
chart
parameter accepts one of two values: candles
or heikinashi
. candles
is the default, but if you set this to heikinashi
, the indicator values will be calculated using Heikin Ashi candles. Note: Pro & Expert Plans only.
true
or false
. Defaults to false
. By setting to true
the API will return a timestamp with every result (real-time and backtracked) to which candle the value corresponds. This is helpful when requesting multiple backtracks.
true
or false
. Defaults to true
. By setting to false
, the API will ensure that there are no candles missing. This often happens on lower timeframes in thin markets. Gaps will be filled by a new candle with 0 volume, and OHLC set the the close price of the latest candle with volume.
number
or max
. Use this parameter to access historical values on the past X candles until the most recent candle. Use max
to return all available historical values. Returns an array with the oldest value on top and most recent value returned the last.
Adjust the RSI length – the number of candles used to calculate the RSI.
Default: 14
More examples
Let's say you want to know the rsi
value on the last closed candle on the 30m
timeframe. You are not interest in the real-time value, so you use the backtrack=1
optional parameter to go back 1 candle in history to the last closed candle.
[GET] https://api.taapi.io/rsi?secret=MY_SECRET&exchange=binance&symbol=BTC/USDT&interval=30m&backtrack=1
Get rsi values on each of the past X candles in one call
Let's say you want to know what the rsi
daily value was each day for the previous 10 days. You can get this returned by our API easily and efficiently in one call using the backtracks=10
parameter:
[GET] https://api.taapi.io/rsi?secret=MY_SECRET&exchange=binance&symbol=BTC/USDT&interval=1d&backtracks=10
Here's the example response:
[
{
"value": 70.03713323772295,
"backtrack": 0
},
{
"value": 68.55107952179476,
"backtrack": 1
},
{
"value": 72.55100476679559,
"backtrack": 2
},
{
"value": 73.51409814264913,
"backtrack": 3
},
{
"value": 69.91451308499144,
"backtrack": 4
},
{
"value": 65.17308969691057,
"backtrack": 5
},
{
"value": 66.17910755701931,
"backtrack": 6
},
{
"value": 68.41845715627683,
"backtrack": 7
},
{
"value": 64.71596338703083,
"backtrack": 8
},
{
"value": 70.76586249275925,
"backtrack": 9
}
]
Looking for even more integration examples in different languages like NodeJS, PHP, Python, Curl or Ruby? Continue to [GET] REST - Direct documentation.