Fees

SDK Cost

The TokenFlight Embed SDK package is open source. The widget package itself does not add a client-side markup to route quotes.

Commercial terms for hosted APIs, support, fiat providers, bridges, DEXs, and gas networks can still apply outside the SDK package.

Transaction Fees

A single swap can involve multiple fee components depending on the route:

Fee Type	Paid In	Description
Gas fee	Source chain native token (ETH, BNB, etc.)	Standard blockchain transaction fee on the source chain
Bridge fee	Varies	Cross-chain bridge protocol fee (Across, DeBridge, etc.)
Protocol fee	Varies	Fee charged by the underlying DEX or liquidity provider

How Fees Are Displayed

• The widget shows an estimated total fee in the quote preview UI before the user confirms.
• Gas estimates are calculated from the source chain's native token and current gas prices.
• Bridge and protocol fees are included in the quote from the API and displayed transparently.
• The "You receive" amount shown to the user is after all fees.

Fee Transparency

All fees are reflected in the quote route details:

• Each route option shows an estimated total fee (denominated in the source chain's native token)
• Users can compare routes to find the lowest-fee option
• The route marked "BEST" is ranked by the best output amount (after fees)

What the SDK Does Not Add

• No TokenFlight SDK markup added on top of route quotes
• No extra browser-side fee layer inside the widget package
• Route providers, bridges, DEXs, fiat providers, and gas networks may still charge their own fees
• The SDK talks to the configured API endpoint for payment data; token logos may load from logoURI image URLs returned by the API