Swap & Cross-Chain

Swap

Estimation

This endpoint retrieves a list of decentralized exchanges (dexes) where the selected pair can be swapped. The list is sorted by profit, so we recommend choosing the first dex in the list.

curl -X 'GET' 'https://api.crowdswap.org/api/v1/swap/estimate-all?fromToken%5Baddress%5D=0x0000000000000000000000000000000000001010&fromToken%5BchainId%5D=137&fromToken%5Bdecimals%5D=18&fromToken%5Bname%5D=Matic%20Token&fromToken%5Bsymbol%5D=MATIC&toToken%5Baddress%5D=0x483dd3425278C1f79F377f1034d9d2CaE55648B6&toToken%5BchainId%5D=137&toToken%5Bdecimals%5D=18&toToken%5Bname%5D=Crowd%20Token&toToken%5Bsymbol%5D=CROWD&amount=1000000000000000000' \
  -H 'accept: application/json'
  -H 'x-api-key: YOUR_API_KEY'

Request

Field

Description

Example

fromToken[address]

Address of source token

0x0000000000000000000000000000000000001010

fromToken[chainId]

Chain id of source token

137

fromToken[decimals]

Decimals of source token

fromToken[name]

Name of source token

Matic Token

fromToken[symbol]

Symbol of source token

MATIC

toToken[address]

Address of destination token

0x483dd3425278C1f79F377f1034d9d2CaE55648B6

toToken[chainId]

Chain id of destination token

137

toToken[decimals]

Decimals of destination token

toToken[name]

Name of destination token

Crowd Token

toToken[symbol]

Symbol of destination token

CROWD

amount

An amount of the source token to be swapped (The decimal of token must be considered in the amount)

1000000000000000000

Response

{
  "successfulEstimationsList": [
    {
      "swapName": "string",
      "delegatedDex": "string",
      "fromToken": "string",
      "fromTokenPrice": "string",
      "toToken": "string",
      "toTokenPrice": "string",
      "amountIn": "string",
      "amountOut": "string",
      "minAmountOut": "string",
      "route": "string",
      "reserves": [
        "string"
      ],
      "priceImpact": "string",
      "poolInfo": "string",
      "swapFee": "string",
      "networkFee": "string",
      "gasPrice": "string",
      "currentDexFeePercentage": "string",
      "crowdswapFeePercentage": "string",
      "swapFeeInUSDT": "string",
      "networkFeeInUSDT": "string",
      "crowdswapFeeInUSDT": "string",
      "totalFeeInUSDT": "string",
      "pricePerToken": "number",
      "cost": "number",
      "totalPaidInUSDT": "string",
      "totalIncomeInUSDT": "string",
      "amountOutInUSDT": "string",
      "amountInInUSDT": "string",
      "amountOutPerAmountInRatio": "string",
      "amountInPerAmountOutRatio": "string",
      "approveAddress": "string",
      "tradeType": "number",
      "trade": {}
    }
  ]
}

Transaction

This endpoint returns from, to, data, value, and gasLimit, all of which needed for executing a swap.

A dex name must be added to the url. The dex name can be found in estimation response e.g., CrowdSwapV2, Quickswap

curl -X 'GET' \
  'https://api.crowdswap.org/api/v1/swap/{dex}?fromToken%5Baddress%5D=0x0000000000000000000000000000000000001010&fromToken%5BchainId%5D=137&fromToken%5Bdecimals%5D=18&fromToken%5Bname%5D=Matic%20Token&fromToken%5Bsymbol%5D=MATIC&toToken%5Baddress%5D=0x483dd3425278C1f79F377f1034d9d2CaE55648B6&toToken%5BchainId%5D=137&toToken%5Bdecimals%5D=18&toToken%5Bname%5D=Crowd%20Token&toToken%5Bsymbol%5D=CROWD&amount=1000000000000000000&userAddress=0x000000000000000000000000000000000000000&receiverAddress=0x000000000000000000000000000000000000000' \
  -H 'accept: application/json'
  -H 'x-api-key: YOUR_API_KEY'

Request

Field

Description

Example

fromToken[address]

Address of source token

0x0000000000000000000000000000000000001010

fromToken[chainId]

Chain id of source token

137

fromToken[decimals]

Decimals of source token

fromToken[name]

Name of source token

Matic Token

fromToken[symbol]

Symbol of source token

MATIC

toToken[address]

Address of destination token

0x483dd3425278C1f79F377f1034d9d2CaE55648B6

toToken[chainId]

Chain id of destination token

137

toToken[decimals]

Decimals of destination token

toToken[name]

Name of destination token

Crowd Token

toToken[symbol]

Symbol of destination token

CROWD

amount

An amount of input tokens to swap (the entrance amount must be based on token's decimal)

1000000000000000000

userAddress

Address of the user who initiates the swap transaction

any arbitrary address

receiverAddress

Address of the recipient if it is different from the userAddress

any arbitrary address

Response

{
  "from": "string",
  "to": "string",
  "data": "string",
  "value": "string",
  "gasLimit": "string"
}

Cross-Chain

Estimation and Transaction

This endpoint finds a route with potentially the best possible outcome for the requested cross-chain pair and returns an estimation.

curl -X 'GET' \
  'https://api.crowdswap.org/api/v1/crossChainSwap/estimate-all?fromToken%5Baddress%5D=0x0000000000000000000000000000000000001010&fromToken%5BchainId%5D=137&fromToken%5Bdecimals%5D=18&fromToken%5Bname%5D=Matic%20Token&fromToken%5Bsymbol%5D=MATIC&toToken%5Baddress%5D=0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE&toToken%5BchainId%5D=56&toToken%5Bdecimals%5D=18&toToken%5Bname%5D=Binance%20Coin&toToken%5Bsymbol%5D=BNB&amountIn=1000000000000000000' \
  -H 'accept: application/json'
  -H 'x-api-key: YOUR_API_KEY'

Request

Field

Description

Example

fromToken[address]

Address of source token

0x0000000000000000000000000000000000001010

fromToken[chainId]

Chain id of source token

137

fromToken[decimals]

Decimals of source token

fromToken[name]

Name of source token

Matic Token

fromToken[symbol]

Symbol of source token

MATIC

toToken[address]

Address of destination token

0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE

toToken[chainId]

Chain id of destination token

toToken[decimals]

Decimals of destination token

toToken[name]

Name of destination token

Binance Coin

toToken[symbol]

Symbol of destination token

BNB

amountIn

An amount of fromToken to be swapped (The decimal of token must be considered in the amount)

1000000000000000000

userAddress

Address of the user who initiates the cross-chain swap transaction

any arbitrary address

Response

{
  "crossChainName": "string",
  "tokenIn": {
    "address": "string",
    "chainId": "number",
    "decimals": "number",
    "amount": "string",
    "symbol": "string"
  },
  "tokenOut": {
    "address": "string",
    "chainId": "number",
    "decimals": "number",
    "amount": "string",
    "symbol": "string"
  },
  "amountIn": "string",
  "amountOut": "string",
  "minAmountOut": "string",
  "approveAddress": "string",
  "status": "number",
  "msg": "string",
  "swapTx": {
    "to": "string",
    "data": "number",
    "value": "number",
    "gasLimit": "string"
  },
  "fees": {
    "token": {
      "address": "string",
      "chainId": "number",
      "decimals": "number",
      "name": "string",
      "symbol": "string"
    },
    "amount": "string",
    "type": "number"
  },
  "includedInOutputFees": {
    "token": {
      "address": "string",
      "chainId": "number",
      "decimals": "number",
      "name": "string",
      "symbol": "string"
    },
    "amount": "string",
    "type": "number"
  },
  "swapSpecData": {}
}

How to send a transaction

Both Swap and Cross-Chain APIs return the data needed for executing a transaction. The data, which named tx in below code, contains from (user address), to (contract address), data (populated data), value (coin value if needed), gasLimit. You can use below code to run your transaction.

To send a transaction, you can get tx from the response of Swap and Cross-Chain end-points.

import { ExternalProvider, Web3Provider } from '@ethersproject/providers';

export class TransactionService{
  private provider?: Web3Provider;

  constructor(){
    this.provider = new Web3Provider(provider as ExternalProvider, 'any');
  }

  function sendTransaction(tx){
    this.provider?.getSigner().sendTransaction(tx);
  }
}

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Last updated 1 year ago