V4 to V5 Migration

Here are the important changes from ParaSwap API v4 to v5:

1. /prices endpoint:

• Renamed Parameters:

  (Note: only the parameter name has changed, the content remains the same).

  • X-Partner (in Headers) → partner (in query): partner/referrer string.

  • from → srcToken(Source Token Address).

  • to → destToken (Destination Token Address).

  • fromDecimals → srcDecimals (Source Token Decimals).

  • toDecimals → destDecimals (Destination Token Decimals)

  ​

• Change in Response Body:

  • The response body of the /prices endpoint has changed to be uniform for all routing methods: simpleSwap, multiPath, and megaPath prices responses. Please infer to this example to understand the response body structure.

    {
      "priceRoute": {
        "blockNumber": 13036269,
        "network": 1,
        "src": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
        "srcDecimals": 18,
        "srcAmount": "10000000000000000",
        "dest": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
        "destDecimals": 6,
        "destAmount": "32704734",
        "bestRoute": [
          {
            "percent": 100,
            "swaps": [
              {
                "src": "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
                "srcDecimals": 18,
                "dest": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
                "destDecimals": 6,
                "swapExchanges": [
                  {
                    "exchange": "UniswapV2",
                    "srcAmount": "10000000000000000",
                    "destAmount": "32704734",
                    "percent": 100,
                    "data": {
                      "router": "0x0000000000000000000000000000000000000000",
                      "path": [
                        "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
                        "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48"
                      ],
                      "factory": "0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f",
                      "initCode": "0x96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f",
                      "feeFactor": 10000,
                      "pools": [
                        {
                          "address": "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc",
                          "fee": 30,
                          "direction": false
                        }
                      ],
                      "gasUSD": "9.835332"
                    }
                  }
                ]
              }
            ]
          }
        ],
        "gasCostUSD": "13.700002",
        "gasCost": "111435",
        "side": "SELL",
        "tokenTransferProxy": "0x0000000000000000000000000000000000000000",
        "contractAddress": "0x0000000000000000000000000000000000000000",
        "contractMethod": "swapOnUniswap",
        "partnerFee": 0,
        "srcUSD": "32.7332000000",
        "destUSD": "32.5799000303",
        "partner": "paraswap",
        "maxImpactReached": false,
        "hmac": "cf2ac4b20f83b6656eb9dd28e26414658430e1d5"
      }
    }

• Other Important changes:

  • The spender parameter in the response body has been changed to the tokenTransferProxy parameter.

  • Everywhere from and to token-parameters are renamed to srcToken & destToken.

2. /transactions endpoint

• Added Parameters:

  • slippage: Could be used instead of destAmount in SELL orders and srcAmount in BUY orders. It will automatically take the quote amount to be the optimal price minus slippage.

  • partnerAddress: Partner Address.

  • partnerFeeBps: Used together with Partner Address.

    Note: Instead of X-partners header or referrer parameter, use partner(if referrer string is available) or partnerAddress if partner address is available.

• Removed Parameters:

  • useReduxToken: REDUX token has been discontinued in v5.

  • X-Partner (in Headers).

• Renamed Parameters:

  • fromDecimals → srcDecimals (Source Token Decimals).

  • toDecimals → destDecimals (Destination Token Decimals)

• Other Changes:

  • network has become a required parameter in /transactions endpoint.