diff --git a/modules/rcart/components/folk-payment-page.ts b/modules/rcart/components/folk-payment-page.ts
index 8a6e974..8b20c64 100644
--- a/modules/rcart/components/folk-payment-page.ts
+++ b/modules/rcart/components/folk-payment-page.ts
@@ -216,7 +216,7 @@ class FolkPaymentPage extends HTMLElement {
 
 			if (p.token === 'ETH') {
 				// Native ETH transfer
-				const weiAmount = BigInt(Math.round(parseFloat(effectiveAmount) * 1e18));
+				const weiAmount = this.parseTokenAmount(effectiveAmount, 18);
 				txHash = await signer.sendTransaction({
 					from: this.walletAccount,
 					to: p.recipientAddress,
@@ -229,7 +229,7 @@ class FolkPaymentPage extends HTMLElement {
 				if (!usdcAddress) throw new Error('USDC not supported on this chain');
 
 				const decimals = p.token === 'USDC' ? 6 : 18;
-				const rawAmount = BigInt(Math.round(parseFloat(effectiveAmount) * (10 ** decimals)));
+				const rawAmount = this.parseTokenAmount(effectiveAmount, decimals);
 
 				// transfer(address to, uint256 amount) — selector: 0xa9059cbb
 				const recipient = p.recipientAddress.slice(2).toLowerCase().padStart(64, '0');
@@ -303,7 +303,7 @@ class FolkPaymentPage extends HTMLElement {
 				txHash = await client.sendTransaction({
 					account,
 					to: p.recipientAddress as `0x${string}`,
-					value: BigInt(Math.round(parseFloat(effectiveAmount) * 1e18)),
+					value: this.parseTokenAmount(effectiveAmount, 18),
 					chain,
 				});
 			} else {
@@ -312,7 +312,7 @@ class FolkPaymentPage extends HTMLElement {
 				if (!usdcAddress) throw new Error('USDC not supported on this chain');
 
 				const decimals = p.token === 'USDC' ? 6 : 18;
-				const rawAmount = BigInt(Math.round(parseFloat(effectiveAmount) * (10 ** decimals)));
+				const rawAmount = this.parseTokenAmount(effectiveAmount, decimals);
 
 				const recipient = p.recipientAddress.slice(2).toLowerCase().padStart(64, '0');
 				const amountHex = rawAmount.toString(16).padStart(64, '0');
@@ -347,6 +347,18 @@ class FolkPaymentPage extends HTMLElement {
 		return this.customAmount || '0';
 	}
 
+	/**
+	 * Parse a decimal amount string into a BigInt with the given decimals.
+	 * Avoids floating-point precision loss for 18-decimal tokens.
+	 * e.g. parseTokenAmount("1.5", 18) → 1500000000000000000n
+	 */
+	private parseTokenAmount(amount: string, decimals: number): bigint {
+		const parts = amount.split('.');
+		const whole = parts[0] || '0';
+		let frac = (parts[1] || '').slice(0, decimals).padEnd(decimals, '0');
+		return BigInt(whole) * BigInt(10 ** decimals) + BigInt(frac);
+	}
+
 	// ── Status update ──
 
 	private async updatePaymentStatus(status: string, method: string, txHash?: string | null, transakOrderId?: string | null) {