Dust classification

To reduce unnecessary screening and save on costs, Layer1 applies a dust classification filter before forwarding transactions. This filter uses each asset’s precision to identify and discard negligible "dust" amounts — typically the result of dust attacks — that don’t represent meaningful activity or actual customer activity.

The logic works as follows:

1. Each asset has a known decimal precision, which determines how many digits can appear after the decimal point.
2. To detect dust, we look at all digits up to the (decimal_precision minus 1)th decimal place.
3. If all of those digits are zero the amount is classified as dust.
4. Otherwise, the amount is considered legitimate and proceeds to our transaction screening provider.

Example: Solana (SOL)

• decimal precision= 9
• We inspect the first 8 digits after the decimal point.
• If a transaction amount is 0.000000001, the first 8 digits are all zero → this is dust.
• If a transaction amount is 0.000000010, the 8th digit is non-zero → this is not dust.

This logic is applied automatically across all assets based on the precision values shown in the table below.

Network	Asset	Decimal Precision
ETHEREUM	ETH	18
ETHEREUM	USDT	6
ETHEREUM	USDC	6
ETHEREUM	DAI	18
BINANCE	ETH	18
TRON	TRX	6
TRON	USDT	6
RIPPLE	XRP	6
BINANCE	BNB	18
BINANCE	USDT	18
BINANCE	USDC	18
BINANCE	DAI	18
ETHEREUM	PYUSD	6
ETHEREUM	FDUSD	18
BINANCE	FDUSD	18
SOLANA	SOL	9
SOLANA	USDC	6
ETHEREUM	WLD	18
POLYGON	POL	18
POLYGON	USDC	6
POLYGON	USDT	6
ETHEREUM	SHIB	18
ETHEREUM	LINK	18
BITCOIN_CASH	BCH	8
BITCOIN	BTC	8
LITECOIN	LTC	8
DOGECOIN	DOGE	8
BINANCE	SHIB	18
BINANCE	LINK	18
SOLANA	USDT	6
SOLANA	PYUSD	6
BASE	ETH	18
BASE	USDC	6
SOLANA	USDG	6