GET
/
base
/
calldata
curl -X POST "https://api.fibrous.finance/base/calldata" \
  -H "Content-Type: application/json" \
  -d '{
    "route_response": {
      "success": true,
      "inputToken": {
        "address": "0x4200000000000000000000000000000000000006",
        "symbol": "ETH",
        "decimals": 18
      },
      "inputAmount": "1000000000000000000",
      "outputToken": {
        "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "symbol": "USDC",
        "decimals": 6
      },
      "outputAmount": "1650230000",
      "route": [
        {
          "protocol": "uniswap",
          "poolAddress": "0x...",
          "tokenIn": "0x4200000000000000000000000000000006",
          "tokenOut": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
        }
      ]
    },
    "slippage": 0.5,
    "signer": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
  }'

{
  "success": true,
  "data": {
    "to": "0x1234...",
    "data": "0x...",
    "value": "0"
  }
}
https://api.fibrous.finance/base Generate the calldata required to execute a swap through the Fibrous Finance router contract. This endpoint provides the raw transaction data that can be used to execute the swap directly through a Web3 provider.

​
Request Body Parameters

​
route_response
object
required
The complete response object from the /base/route endpoint. This contains all the necessary information about the optimal route.
​
slippage
number
required
Maximum acceptable slippage in percentage (0.1 to 49). Example: 0.5 for 0.5% slippage tolerance
​
signer
string
required
The address that will sign and execute the transaction. This address must have sufficient balance of the input token.

​
Response

​
success
boolean
Indicates if the request was successful.
​
calldata
string
The hex-encoded calldata to execute the swap through the router contract.

​
Error Responses

​
Invalid Route

{
  "success": false,
  "error": "Invalid route",
  "details": "The provided route is invalid or expired"
}

​
Invalid Slippage

{
  "success": false,
  "error": "Invalid slippage",
  "details": "Slippage must be between 0.1 and 49"
}

​
Invalid Signer

{
  "success": false,
  "error": "Invalid signer",
  "details": "The provided signer address is not valid"
}

curl -X POST "https://api.fibrous.finance/base/calldata" \
  -H "Content-Type: application/json" \
  -d '{
    "route_response": {
      "success": true,
      "inputToken": {
        "address": "0x4200000000000000000000000000000000000006",
        "symbol": "ETH",
        "decimals": 18
      },
      "inputAmount": "1000000000000000000",
      "outputToken": {
        "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "symbol": "USDC",
        "decimals": 6
      },
      "outputAmount": "1650230000",
      "route": [
        {
          "protocol": "uniswap",
          "poolAddress": "0x...",
          "tokenIn": "0x4200000000000000000000000000000006",
          "tokenOut": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
        }
      ]
    },
    "slippage": 0.5,
    "signer": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
  }'

{
  "success": true,
  "data": {
    "to": "0x1234...",
    "data": "0x...",
    "value": "0"
  }
}

​
Usage with Web3

Once you have the calldata, you can execute the swap using any Web3 library: 
// Using ethers.js
const tx = await signer.sendTransaction({
  to: ROUTER_ADDRESS,
  data: calldata,
  value: inputAmount // if swapping ETH
});

// Using web3.js
const tx = await web3.eth.sendTransaction({
  from: signerAddress,
  to: ROUTER_ADDRESS,
  data: calldata,
  value: inputAmount // if swapping ETH
});

​
Tips

  1. Always verify the min_received amount matches your expectations
  2. Check that the destination address is correct
  3. Consider gas costs when splitting across multiple protocols
  4. Store the route response before requesting calldata

​
Rate Limits

Please refer to our rate limiting documentation for details about request limits and quotas.