EVM Transactions

Build unsigned transactions for token swaps.

Get Buy Transaction

Build an unsigned transaction for buying tokens. Endpoint: /evm/buy/transaction

Parameter	Type	Required	Description
`chain`	string	Yes	Chain identifier
`token`	string	Yes	Token contract address
`swapMode`	string	Yes	`ExactIn` or `ExactOut`
`amountIn`	string	Yes	Amount of native currency in wei
`wallet`	string	Yes	Wallet address
`slippageBps`	number	No	Slippage tolerance in basis points (default: 100 = 1%)
`feeBps`	number	No	Fee in basis points (0-175)
`feeRecipient`	string	No	Wallet to receive fees
`sendRoute`	string	No	`Public`, `Private`, or `Both` for MEV protection

Example:

Socket.IO
HTTP

socket.emit("/evm/buy/transaction", {
  chain: "eth",
  token: "0x6982508145454Ce325dDbE47a25d4ec3d2311933",
  swapMode: "ExactIn",
  amountIn: "1000000000000000000",
  wallet: "0x10a64c6d7f12c47b7c66c5b4e20e72bc1fcd5d9e",
  slippageBps: 100,
  sendRoute: "Private",
});

await fetch("https://api.chainworks.co/evm/buy/transaction", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    Authorization: CHAINWORKS_API_AUTH_TOKEN,
  },
  body: JSON.stringify({
    chain: "eth",
    token: "0x6982508145454Ce325dDbE47a25d4ec3d2311933",
    swapMode: "ExactIn",
    amountIn: "1000000000000000000",
    wallet: "0x10a64c6d7f12c47b7c66c5b4e20e72bc1fcd5d9e",
    slippageBps: 100,
    sendRoute: "Private",
  }),
});

Get Sell Transaction

Endpoint: /evm/sell/transaction Same parameters as buy transaction.

Get Approve Transaction

Build a transaction to approve token spending. Endpoint: /evm/approve/transaction

Parameter	Type	Required	Description
`chain`	string	Yes	Chain identifier
`token`	string	Yes	Token contract address
`wallet`	string	Yes	Wallet granting approval
`spender`	string	Yes	Contract address to approve

Getting Started

SVM (Solana)

EVM Chains

Reference

Get Buy Transaction

Get Sell Transaction

Get Approve Transaction

​Get Buy Transaction

​Get Sell Transaction

​Get Approve Transaction

Get Buy Transaction

Get Sell Transaction

Get Approve Transaction