Quote & Swap APIs

Get the best single-step route for swapping X to Y

1. Get Quote (Test)

Using the quote method, you can get a preview of the best route for this cross-chain swap. It goes through all the possible DEXs, bridges and aggregators to find the best possible single-step route based on user experience, fee amount, and swap output.

Typescript

const quoteResponse = await rangoClient.quote({
    from: {"blockchain": "BSC", "symbol": "BNB", "address": null},
    to: {"blockchain": "AVAX_CCHAIN", "symbol": "USDT.E", "address": "0xc7198437980c041c805a1edcba50c1ce5db95118"},
    amount: "100000000000000000" // 0.1 BSC.BNB
})

cURL

curl --request GET \
     --url 'https://api.rango.exchange/basic/quote?from=BSC.BNB&to=AVAX_CCHAIN.USDT.E--0xc7198437980c041c805a1edcba50c1ce5db95118&amount=100000000000000000&apiKey=c6381a79-2817-4602-83bf-6a641a409e32' \
     --header 'accept: */*'

Quote (Get Best Route)rango-exchange

Get Quote Swagger Link

Quote Request

Param	Description
from *	The source asset
to *	The destination asset
amount *	The big number amount (machine readable) of asset X that is going to be swapped, e.g. 100000000000000000000 for 100 Fantom.FTM
slippage	Amount of user's preferred slippage in percent. if you don't send it, it will assume 0.5% slippage. (It's used to filter the swappers or routes that are not suitable for the given slippage)
swappers	List of all accepted swappers, an empty list means no filter is required.
swappersExclude	Defines the provided swappers as the include/exclude list. Default is false (include)
swapperGroups	The list of all included/excluded swappers based on tag, empty list means no filter is required
swappersGroupsExclude	Defines the provided swappers' tags as the include/exclude list. Default is false (include)
contractCall	important: set this parameter to true if you want to send transactions through a contract. It will filter swappers that are not possible to be called by another contract.
sourceContract	Address of your contract on source chain (will be called in case of refund in the source chain)
destinationContract	Address of your contract on destination chain (will be called in case of success/refund in the destination chain)
messagingProtocols	Message protocols which will be used to relay message in a cross-chain swap. An empty list means no filter is required.
imMessage	The message that you want to pass to your contract on the destination chain
referrerFee	Referrer fee in percent

Quote Response

Field	Description
requestId	The unique request Id which is generated for this request by the server. It should be passed down to all other endpoints if this swap continues on. e.g. d10657ce-b13a-405c-825b-b47f8a5016ad
resultType	Status of the route: OK, HIGH_IMPACT, INPUT_LIMIT_ISSUE, NO_ROUTE
route	The quote route object

Status (Result Type)

Based on resultType field, you could decide if the quote response is valid or need to show a proper message to the user (or retry). Possible values for this field are OK , HIGH_IMPACT , INPUT_LIMIT_ISSUE and NO_ROUTE.

resultType	Reason
OK	Best route found. Everything is OK.
HIGH_IMPACT	If the best route has a high price impact, we recommend not proceeding with the next step (swap). The Rango API may give you an error in the next step to prevent potential losses.
INPUT_LIMIT_ISSUE	There is a limit issue for the input amount. You could suggest user increase/decrease the input amount based on amountRestrictionsfield in response.
NO_ROUTE	No routes found.

Limits (Amount Restrictions)

The route.amountRestriction field indicates the minimum and maximum possible input amount for this quote. EXCLUSIVE field means that min<input<max and INCLUSIVE means min<=input<=max.

Fee (Expense Types)

These are two possible types of fees (expenseType field in the route.fee array).

expenseType	Description
FROM_SOURCE_WALLET	The gas fee. This fee should be available in the user's wallet for the swap to succeed.
DECREASE_FROM_OUTPUT	Some hidden fees in swapper which will be reduced from the user's output amount automatically. This fee is already calculated in the estimated output.

2. Swap (Test)

It's similar to the quote method but gives the actual transaction data in response besides the route.

Typescript

const swapResponse = await rangoClient.swap({
    from: {"blockchain": "BSC", "symbol": "BNB", "address": null},
    to: {"blockchain": "AVAX_CCHAIN", "symbol": "USDT.E", "address": "0xc7198437980c041c805a1edcba50c1ce5db95118"},
    amount: "100000000000000000" // 0.1 BSC.BNB3
    fromAddress: "0xeb2629a2734e272bcc07bda959863f316f4bd4cf",
    toAddress: "0xeb2629a2734e272bcc07bda959863f316f4bd4cf",
    disableEstimate: true,
    slippage: '1.0',
})

cURL

curl --request GET \
     --url 'https://api.rango.exchange/basic/swap?from=BSC.BNB&to=AVAX_CCHAIN.USDT.E--0xc7198437980c041c805a1edcba50c1ce5db95118&amount=100000000000000000&slippage=3&swappers=&fromAddress=0x6f33bb1763eebead07cf8815a62fcd7b30311fa3&toAddress=0x6f33bb1763eebead07cf8815a62fcd7b30311fa3&apiKey=c6381a79-2817-4602-83bf-6a641a409e32' \
     --header 'accept: */*'

Swap (Create Transaction)rango-exchange

Swap Swagger Link

Swap Request

Param	Description
from *	The asset X that user likes to swap
to *	The asset Y that user wants to swap X into that
amount *	The machine-readable amount of asset X that is going to be swapped
slippage *	User slippage for this swap (e.g. 1.5 which means 1.5% slippage)
fromAddress *	User source wallet address
toAddress *	User destination wallet address
disableEstimate	This field should be false when the client wants to preview the route to the user and true when the user accepts the swap. If it's true, the server will be much slower to respond but will check some prerequisites, including the balance of X and any required fees in the user's wallets. Important: If you are checking the balance and fee amount on your client side, it's recommended to pass this param as true.
referrerAddress	Referrer wallet address
referrerFee	Referrer fee in percent, (e.g. 0.3 means: 0.3% fee based on input amount)
swappers	List of all accepted swappers, an empty list means no filter is required.
swappersExclude	Defines the provided swappers as the include/exclude list. Default is false (include)
swapperGroups	The list of all included/excluded swappers based on tag, empty list means no filter is required
swappersGroupsExclude	Defines the provided swappers' tags as the include/exclude list. Default is false (include)
messagingProtocols	List of all messaging protocols, an empty list means no filter is required.
infiniteApprove	Use this parameter if you want infinite approve from user
contractCall	important: set this parameter to true if you want to send transactions through a contract. It will filter swappers that are not possible to be called by another contract.
sourceContract	Address of your contract on source chain (will be called in case of refund in the source chain)
destinationContract	Address of your contract on destination chain (will be called in case of success/refund in the destination chain)
imMessage	The message that you want to pass to your contract on the destination chain

Swap Response

Field	Description
requestId	The unique request Id which is generated for this request by the server. It should be passed down to all other endpoints if this swap continues on. e.g. d10657ce-b13a-405c-825b-b47f8a5016ad
resultType	Status of the route, possible values are: OK, HIGH_IMPACT, INPUT_LIMIT_ISSUE, NO_ROUTE. Important: This is the status of route same as the quote response. If there was any error in creating tx, it will be appear in error field. So you could check (error !== null) && (status === 'OK') to make sure everything is ok before proceeding with the next step.
route	The quote route object. Similar to the quote response.
error	Error message (raw string) if there is any problem in creating transaction. (error === null <=> tx !== null)
tx	Transaction data for this route.

Check this link to see an example of transaction data:

pageSample Transactions