Fees

There is no separate fee transaction. Everything is priced into the quote: amount_out is already net of every component below, and fee_breakdown explains the difference between what the user puts in and what they get out.

Components

Each entry in fee_breakdown.components has a name, a side, a cost in usd_micros, and for gas components a native amount in base units of that chain’s native asset.

Name	Side	What it covers
`bps_spread`	dst	The operator spread on the trade.
`same_chain_swap_fee`	dst	The spread on a same-chain swap, in place of `bps_spread`.
`asset_conversion`	dst	Conversion fee and risk premium on a cross-asset lane, such as USDC to USDG.
`dst_fulfill_gas`	dst	Gas to submit the fulfillment on the destination chain.
`dst_ata_create`	dst	Rent to create the recipient’s associated token account, on Solana destinations only.
`referrer_fee`	dst	The share taken by referrers on the quote.
`gas_drop`	dst	The native asset delivered to the recipient, when requested.
`src_refund_gas`	src	Gas reserved to refund the deposit if the order cannot be fulfilled.
`src_ata_create`	src	Rent to create a token account on a Solana source.
`src_burn_cost`, `dst_burn_cost`	src, dst	Cost reserved for burning a stuck transaction’s nonce on either side.
`sponsor_gas`	src	The relay gas on a gasless order. Absent when the quote was requested with `sponsor_fees` — the partner’s funding balance pays it instead.

side says which leg of the trade the cost belongs to, not who pays it. Every component is deducted from the same trade before amount_out is computed. Components are only present when they apply. An Arbitrum to Solana USDC transfer with no referrer and no gas drop carries the spread and gas components; a cross-asset or gasless quote adds its own.

Totals

Field	Meaning
`src_total_usd_micros`	Sum of the source-side components.
`dst_total_usd_micros`	Sum of the destination-side components.
`src_gas_native`	Source gas commitment in native base units.
`dst_gas_native`	Destination gas commitment in native base units.

USD values are integers in micros: 1000000 is one dollar. Divide by 1,000,000 to display, and keep them as strings until you do — they exceed safe integer range in aggregate.

import { formatUsdMicros } from "<SDK_PACKAGE>";

const total =
  BigInt(quote.feeBreakdown.srcTotalUsdMicros) +
  BigInt(quote.feeBreakdown.dstTotalUsdMicros);

formatUsdMicros(total.toString());

The spread

The operator spread is basis points on cross-chain quotes and on same-chain swaps. It appears as bps_spread or same_chain_swap_fee. Quotes requested without an API key pay an additional basis points, folded into the same component. The difference is not itemized, so a keyless integration silently prices worse than a keyed one. See API keys.

Gas is committed, not estimated at settlement

dst_fulfill_gas and src_refund_gas are computed from the live gas price at quote time and then committed. The operator absorbs the difference if gas rises before the fulfillment lands, which is why a quote left sitting for a long time is refreshed rather than honored. The one place this is visible to a user is refunds: if gas has risen far enough that the refund would cost more than the committed src_refund_gas, the refund waits for gas to come down rather than eating the deposit. See Refunds.

Displaying fees

Show amount_out as the headline number — it is already net. Use the breakdown for the detail row, grouped by side, and label gas_drop as an amount the user receives rather than a cost, because that is what it is. Referrer fees are part of the same breakdown. If you set them, they are yours; see Referral program.

Overview

Concepts

Components

Totals

The spread

Gas is committed, not estimated at settlement

Displaying fees

​Components

​Totals

​The spread

​Gas is committed, not estimated at settlement

​Displaying fees

Components

Totals

The spread

Gas is committed, not estimated at settlement

Displaying fees