SDK Token Swaps
Build and execute token swaps with AI-powered 0x routing.
Prompt Patterns
Pattern Example
Amount-based "Swap 0.1 ETH to USDC"
Value-based "Buy $100 worth of DEGEN"
Percentage "Swap 50% of my ETH to USDC"
Sell all "Sell all my DEGEN"
Chain-specific "Swap ETH to USDC on Polygon"
Amount Swaps
"Swap 0.1 ETH to USDC" "Exchange 100 USDC for WETH" "Swap 1000 DEGEN to ETH"
Value Swaps
"Buy $100 worth of DEGEN" "Purchase $50 of ETH"
Percentage Swaps
"Swap 50% of my ETH to USDC" "Sell 25% of my DEGEN"
Chain-Specific
"Swap 0.1 ETH to USDC on Base" "Exchange 100 USDC for WETH on Ethereum"
ERC20 Approval Handling
For ERC20 swaps (selling tokens other than ETH), approval is required before the swap.
const result = await client.promptAndWait({ prompt: "Swap 100 USDC to WETH", });
const swapTx = result.transactions?.find(tx => tx.type === "swap");
// Check if approval is needed if (swapTx?.metadata.approvalRequired) { // Execute pre-built approval transaction first await wallet.sendTransaction(swapTx.metadata.approvalTx); }
// Then execute the swap await wallet.sendTransaction(swapTx.metadata.transaction);
Approval Fields
Field Description
approvalRequired
Whether approval needed before swap
approvalTx
Pre-built approval transaction (ready to send)
allowanceTarget
0x AllowanceHolder address (for manual approval)
Usage
import { BankrClient } from "@bankr/sdk";
const client = new BankrClient({
privateKey: process.env.BANKR_PRIVATE_KEY as 0x${string},
});
const result = await client.promptAndWait({ prompt: "Swap 0.1 ETH to USDC on Base", });
if (result.status === "completed" && result.transactions?.length) { const tx = result.transactions[0].metadata.transaction; await wallet.sendTransaction(tx); }
Supported Chains
Chain Native Token Default
Base ETH Yes
Ethereum ETH No
Polygon MATIC No
Solana SOL No
Related Skills
-
sdk-capabilities: Full list of supported operations
-
sdk-transaction-builder: Other transaction types (transfers, NFTs)
-
sdk-wallet-operations: Client setup and configuration