Stargate UX on Tempo

What changes for consumers

Stargate on Tempo works the same way as on other chains, with these UX differences:

Fees are paid in LZD (an ERC-20) instead of via msg.value
Additional approvals required: asset token, stablecoin to LZD for wrapping, and LZD to Stargate
No native drop: you cannot send native tokens to the destination
Bus mode disabled: all sends are quoted and executed on-chain

Fee payment

On standard chains, send() accepts fees via msg.value. On Tempo, send() requires an LZD approval instead:

// Standard chain: fees via msg.value
MessagingFee memory fee = stargate.quoteSend(sendParam, false);
stargate.send{value: fee.nativeFee}(sendParam, fee, refundAddress);

// Tempo: fees via LZD approval
MessagingFee memory fee = stargate.quoteSend(sendParam, false);
IERC20(lzd).approve(address(stargate), fee.nativeFee); // approve LZD
stargate.send{value: 0}(sendParam, fee, refundAddress); // msg.value = 0

quoteSend() returns both nativeFee and lzTokenFee. _payInLzToken selects the payment token. At the time of writing, _payInLzToken is not enabled on Tempo, so set it to false and use nativeFee (LZD).

Approval flow

Sending through Stargate on Tempo requires approving both the asset token and the LZD fee token:

// 1. Quote the send
MessagingFee memory fee = stargate.quoteSend(sendParam, false);

// 2. Approve the asset token (e.g., USDC.e) for the bridge amount
IERC20(usdce).approve(address(stargate), bridgeAmount);

// 3. Wrap stablecoin into LZD and approve for the fee
IERC20(usdce).approve(address(lzd), fee.nativeFee);
lzd.wrap(usdce, msg.sender, fee.nativeFee);
IERC20(lzd).approve(address(stargate), fee.nativeFee);

// 4. Send with msg.value = 0
stargate.send{value: 0}(sendParam, fee, refundAddress);

The TempoOFTWrapper reduces this to a single approval + one sendOFT call by bundling wrap, approve, and send into an atomic transaction.

Supported tokens

Source token	Tempo token	Can pay gas on Tempo	Can pay LZ fees
USDC	USDC.e	yes	yes
EURC	EURC.e	no	no
USDT	USDT0	TBD	TBD

The EURC problem

Users who bridge only EURC to Tempo will be stuck. EURC.e cannot pay gas on Tempo and is not whitelisted by LZD for LayerZero fee payment. Without a USD stablecoin balance, the user cannot execute any transaction, not even a transfer or swap.

If your frontend supports EURC bridging to Tempo, display a warning modal informing users that they must also bridge USDC to cover transaction fees on Tempo.

Comparison table

Aspect	Standard Stargate	Stargate on Tempo
Fee payment	`msg.value` (native token)	LZD approval (ERC-20)
Approvals	asset token only	asset token + stablecoin to LZD + LZD to Stargate
msg.value	required for fees	must be 0
Native drop	supported	not supported
Quote denomination	native token (ETH, etc.)	LZD (USD-denominated)
Bus mode	supported	disabled

Bus mode

Bus mode is disabled on Tempo. Sends are executed as direct on-chain transactions with their own quoted fees.

LayerZero for Tempo

How-To

Reference

Stargate UX on Tempo

What changes for consumers

Fee payment

Approval flow

Supported tokens

The EURC problem

Comparison table

Bus mode