Trading Tokens

Use the npx agnic@latest trade command to swap tokens on Base network. You must be authenticated to trade.

Confirm wallet is initialized and authed

npx agnic@latest status

If the wallet is not authenticated, refer to the authenticate-wallet skill.

Command Syntax

npx agnic@latest trade <amount> <from> <to> [options]

Arguments

Argument	Description
amount	Amount to swap (see Amount Formats below)
from	Source token: alias (usdc, eth, weth) or contract address (0x...)
to	Destination token: alias (usdc, eth, weth) or contract address (0x...)

Amount Formats

Format	Example	Description
Dollar prefix	'$1.00', '$0.50'	USD notation (decimals based on token)
Decimal	1.0, 0.50, 0.001	Human-readable with decimal point
Whole number	5, 100	Interpreted as whole tokens
Atomic units	500000	Large integers treated as atomic units

Auto-detection: Large integers without a decimal point are treated as atomic units. For example, 500000 for USDC (6 decimals) = $0.50.

IMPORTANT: Always single-quote amounts that use $ to prevent bash variable expansion (e.g. '$1.00' not $1.00).

Token Aliases

Alias	Token	Decimals	Address
usdc	USDC	6	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
eth	ETH	18	0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
weth	WETH	18	0x4200000000000000000000000000000000000006

Options

Option	Description
-s, --slippage <n>	Slippage tolerance in basis points (100 = 1%)
--json	Output result as JSON

Input Validation

Before constructing the command, validate all user-provided values to prevent shell injection:

• amount: Must match ^\$?[\d.]+$ (digits, optional decimal point, optional $ prefix). Reject if it contains spaces, semicolons, pipes, backticks, or other shell metacharacters.
• from / to: Must be a known alias (usdc, eth, weth) or a valid 0x hex address (^0x[0-9a-fA-F]{40}$). Reject any other value.
• slippage: Must be a positive integer (^\d+$).

Do not pass unvalidated user input into the command.

Examples

# Swap $1 USDC for ETH (dollar prefix — note the single quotes)
npx agnic@latest trade '$1' usdc eth

# Swap 0.50 USDC for ETH (decimal format)
npx agnic@latest trade 0.50 usdc eth

# Swap 0.01 ETH for USDC
npx agnic@latest trade 0.01 eth usdc

# Swap with custom slippage (2%)
npx agnic@latest trade '$5' usdc eth --slippage 200

# Get JSON output
npx agnic@latest trade '$1' usdc eth --json

Prerequisites

• Must be authenticated (npx agnic@latest status to check)
• Wallet must have sufficient balance of the source token
• Trading is only available on Base mainnet

Error Handling

Common errors:

• "Not authenticated" — Run npx agnic@latest auth login first
• "Invalid token" — Use a valid alias (usdc, eth, weth) or 0x address
• "Cannot swap a token to itself" — From and to must be different
• "Swap failed: TRANSFER_FROM_FAILED" — Insufficient balance or approval issue
• "No liquidity" — Try a smaller amount or different token pair
• "Amount has X decimals but token only supports Y" — Too many decimal places