Welcome to ChangeNOW API! It is an effective and convenient way to increase the features of your service. You can easily integrate the system of cryptocurrency exchange without any hassle.
ChangeNOW API is built for developers and is followed with detailed technical documentation. It operates with HTTPS protocol and provides a number of methods for the queries to be placed and the responses to be returned for each operation. All the responses are delivered through JSON API format.
We are always happy to hear your suggestions and feedback. Please address all your queries to our development team at [email protected]
This API endpoint returns the list of available currencies. Some currencies get enabled or disabled from time to time, so make sure to refresh the list occasionally.
Query params:
active (Optional): Set true to return only active currencies
Successful response:
[
{
ticker: "btc",
name: "Bitcoin",
image: "https://changenow.io/images/coins/btc.svg",
hasExternalId: false,
isFiat: false,
featured: false
}
]
The API endpoint returns minimal payment amount required to make an exchange. If you try to exchange less, the transaction will most likely fail.
Params:
from_to: Underscrore separated pair of tickers
Successful response:
{
minAmount: 0.005
}
This API endpoint returns estimated exchange amount of coins to be received on the exchange.
Params:
amount: Amount of fund you want to exchagne (example: 1.314452)
from_to: Underscore separated pair of tickers
Successful response:
{
estimatedAmount: "21.827315",
transactionSpeedForecast: "5-45",
networkFee: 0.006,
serviceCommission: 0.5,
warningMessage: null
}
Transaction speed forecast is dash-separated min and max estimated time in minutes
The API endpoint generates an address for sending funds and returning transaction attributes.
Params:
api_key: Your API keyRequest params:
from (Required): Ticker of a currency you want to send
to (Required): Ticker of a currency you want to receive
address (Required): Address to receive a currency
amount (Required): Amount you want to exchnage
extraId (Optional): Extra Id for currencies that require it
Successful response:
{
id: "b712390255",
payinAddress: "3GCKvrKXrJ7Efdrn2Ed6V82rVAQv8GMLaj",
payoutAddress: "0x9d8032972eED3e1590BeC5e9E4ea3487fF9Cf120",
payinExtraId: null,
fromCurrency: "btc",
toCurrency: "eth"
}
Notice id in response, you can use it to get transaction status, read further how
The API endpoint returns transactions initiated by users. Transactions are sorted by the time they were last updated in descending order (i.e. status update time).
Params:
api_key: Your API keyQuery params:
from (Optional): Ticker of a payin currency
to (Optional): Ticker if payout currency
status (Optional): Transaction status (available statuses below)
limit (Optional): Limit of transactions to return (default: 10)
offset (Optional): Number of transactions to skip
Successful response:
[
{
id: "b712390255",
status: "finished",
payinConfirmations: 12,
hash: "transactionhash",
payinHash: "58eccbfb713d430004aa438a",
payoutHash: "58eccbfb713d430004aa438a",
payinAddress: "58eccbfb713d430004aa438a",
payoutAddress: "0x9d8032972eED3e1590BeC5e9E4ea3487fF9Cf120",
payinExtraId: "123456",
payoutExtraId: "123456",
fromCurrency: "btc",
toCurrency: "eth",
amountSend: "1.000001",
amountReceive: "20.000001",
networkFee: "0.000001",
updatedAt: "2017-11-29T19:17:55.130Z"
}
]
Possible transaction statuses
This API endpoint returns single transaction status. Transaction id is taken from create transaction request.
Params:
id: Transaction id from create transaction request
api_key: Your API key
Successful response:
{
id: "b712390255",
status: "finished",
payinConfirmations: 12,
hash: "transactionhash",
payinHash: "58eccbfb713d430004aa438a",
payoutHash: "58eccbfb713d430004aa438a",
payinAddress: "58eccbfb713d430004aa438a",
payoutAddress: "0x9d8032972eED3e1590BeC5e9E4ea3487fF9Cf120",
payinExtraId: "123456",
payoutExtraId: "123456",
fromCurrency: "btc",
toCurrency: "eth",
amountSend: "1.000001",
amountReceive: "20.000001",
networkFee: "0.000001",
updatedAt: "2017-11-29T19:17:55.130Z"
}
Possible transaction statuses are listed in list transactions method
API provides socket.io endpoint to subscribe to transactions status update events.
Sample usage example with JavaScript:
var socket = io('https://changenow.io/');
socket.on('connect', function(){
socket.emit(
"subscribe",
{
apiKey: "your-api-key",
}
);
});
socket.on("transaction-status", function(data) {
console.log('transaction update: ', data.transaction);
});
Sample event payload:
{
transaction: {
id: "b712390255",
status: "finished",
payinConfirmations: 12,
hash: "transactionhash",
payinHash: "58eccbfb713d430004aa438a",
payoutHash: "58eccbfb713d430004aa438a",
payinAddress: "58eccbfb713d430004aa438a",
payoutAddress: "0x9d8032972eED3e1590BeC5e9E4ea3487fF9Cf120",
payinExtraId: "123456",
payoutExtraId: "123456",
fromCurrency: "btc",
toCurrency: "eth",
amountSend: "1.000001",
amountReceive: "20.000001",
networkFee: "0.000001",
updatedAt: "2017-11-29T19:17:55.130Z"
}
}
Possible transaction statuses are listed in list transactions method
API has a built-in scam identification. All the submitted crypto services will be subject to scam checking. The method will respond with “true” or “false” according to the status service.
Params:
site: Site to examine (i.e. changenow.io)Successful response:
{
scam: false
}
Libraries that can be used for easy integration with the ChangeNOW API.
Start creating integrations using changenow.io API. To access ChangeNOW API sign up for the Affiliate program. Available at the click of a button!