Nodejs

Getting started

This package acts as a typescript wrapper on top of the Ston.fi Omniston protocol API. It uses RxJs to provide observables on top of the WebSocket API connection

Installation

via NPM

npm install @ston-fi/omniston-sdk

via YARN

yarn add @ston-fi/omniston-sdk

via PNPM

pnpm install @ston-fi/omniston-sdk

Create an instance

Create an Omniston instance, specifying the API URL.

import { Omniston } from "@ston-fi/omniston-sdk";

const omniston = new Omniston({
  apiUrl: "wss://omni-ws.ston.fi",
});

The constructor takes the following parameters:

Name	Type	Description
client	ApiClient | undefined	Optional. Provide this if you want to override the default API client. By default, this will be an ApiClient using ReconnectingTransport
apiUrl	URL | string	Omniston WebSocket API URL.

Get list of supported assets

const assetList = await omniston.assetList();

An AssetsResponse has the following properties:

Name	Type	Description
assets	AssetInfo[]	List of supported assets

An AssetInfo has the following properties:

Name	Type	Description
address	Address	Address of smart contract
tags	string[]	Asset tags
symbol	string	Asset symbol
name	string	Displayable name
image_url	string	URL to asset image
decimals	number	Number of decimal places used to represent fractional amounts of an asset
metadata	Record<string, unknown>	Additional metadata, excluding above fields

An Address has the following properties:

Name	Type	Description
blockchain	Blockchain	Blockchain type (e.g. "TON")
address	string	Address of smart contract

Send a quote request

Send a request for quote to swap an asset to another asset.

omniston
  .requestForQuote({
    settlementMethods: [SettlementMethod.SETTLEMENT_METHOD_SWAP],
    askAssetAddress: {
      blockchain: Blockchain.TON,
      address: "EQA2kCVNwVsil2EM2mB0SkXytxCqQjS4mttjDpnXmwG9T6bO", // STON
    },
    offerAssetAddress: {
      blockchain: Blockchain.TON,
      address: "EQCxE6mUtQJKFnGfaROTKOt1lZbDiiX1kCixRv7Nw2Id_sDs", // USDT
    },
    amount: {
      offerUnits: "1000000", // 1 USDT
    },
  })
  .subscribe((quote) => {
    if (!quote) return;

    // process the quote
  });

A QuoteRequest has the following properties:

Name	Type	Description
settlementMethods	SettlementMethod[]	Supported methods of swap settlement
askAssetAddress	Address	Blockchain-specific address of ask asset
offerAssetAddress	string	Blockchain-specific address of offer asset
amount	{ offerUnits: string } | { askUnits: string }	Either the amount of offer asset or ask asset
amount.offerUnits	string	The amount of offer asset the trader wants to pay, including all fees, in base asset units
amount.askUnits	string	The amount of ask asset the trader wants to get after all fees, in base asset units
referrerAddress	Address | undefined	The address of referrer that will receive the fees
referrerFeeBps	number | undefined	The amount of fees required by the referrer in basis points (1/10000 or 0.01%)

The server returns Observable<Quote | null>, which is a stream of quotes. Learn more about Observable types in the official RxJS documentation.

A Quote has the following properties:

Name	Type	Description
quoteId	string	ID of the quote generated by the platform
resolverId	string	ID of the resolver
resolverName	string	Name of the resolver
offerAssetAddress	Address	Blockchain-specific address of offer asset
askAssetAddress	Address	Blockchain-specific address of ask asset
offerUnits	string	The amount of offer asset the trader must pay, including all fees
askUnits	string	The amount of ask asset the trader will get after all fees
referrerAddress	Address | undefined	The address of referrer that will receive the fees
referrerFeeUnits	string	The amount of fees that the referrer will get (in units of offerAssetAddress)
protocolFeeUnits	string	The amount of fees charged by the protocol (in units of offerAssetAddress).
quoteTimestamp	number	The timestamp (UTC seconds) of Quote sent by resolver
tradeStartDeadline	number	Max timestamp (UTC seconds) of start of the trade
params	object | undefined	Various parameters specific to the settlement method. See the source code for more details.

Build a transaction

Now that we have a quote, we should request a server to build a transaction to initiate the trade that the user can verify and sign.

const tx = await omniston.buildTransfer({
  quote,
  sourceAddress: {
    blockchain: Blockchain.TON,
    address: "", // sender wallet address on `offerBlockchain`
  },
  destinationAddress: {
    blockchain: Blockchain.TON,
    address: "", // receiver wallet address on `askBlockchain`
  },
  maxSlippageBps: 100, // 1%
});

const messages = tx.transaction!.ton!.messages;

The buildTransfer method takes a TransactionRequest object as a parameter, having the following properties:

Name	Type	Description
quote	Quote	The valid quote received from Omniston.requestForQuote
sourceAddress	Address	The address on offerBlockchain that will send initial transaction to start the trade
destinationAddress	Address	The address on askBlockchain that will receive result of the trade
maxSlippageBps	number	Max price slippage in basis points (1/10000 or 0.01%)

Sign the transaction

You can send messages to any library of your choice. Take a look at our transaction sending guide with examples of different popular packages

Listen for trade status updates

After the user has signed and initiated the transaction, we can track the trade status.

const tradeStatus = omniston.trackTrade({
  quoteId: quote.quoteId,
  traderWalletAddress: {
    blockchain: Blockchain.TON,
    address: "", // sender wallet address on `offerBlockchain`
  },
});

tradeStatus.subscribe((status) => {
  console.log(JSON.stringify(status));
});

The trackTrade method has the following parameters:

Name	Type	Description
quoteId	string	ID of the quote received from Omniston.requestFromQuote
traderWalletAddress	Address	The address of trader's wallet that initiated transaction

It returns Observable<TrackTradeStatus>. For the different trade status values, see the source code. We are interested in the trade result enum which can be read from status.tradeSettled?.result? field. The enum has the following values:

Name	Description
TRADE_RESULT_FULLY_FILLED	The trade has been completed and fully filled.
TRADE_RESULT_PARTIALLY_FILLED	The trade has been partially filled. Something went wrong.
TRADE_RESULT_ABORTED	The trade has been aborted.
TRADE_RESULT_UNKNOWN
UNRECOGNIZED