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Fixed rates let a cross-chain transfer deliver its exact input amount, handling any slippage and bridging or swapping fees invisibly. A wallet that sends 100 USDC on Solana delivers 100 USDT on Arbitrum. This suits payouts, remittances, and any flow where a recipient expects an exact figure. Without fixed rates, bridging fees, swap fees, and slippage all come out of the transfer, so the amount that arrives is smaller than the amount sent.

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Setup

Fixed rates require an Enterprise account with postpaid billing. Contact [email protected] to enable them for an app.
Privy enables fixed rates per app. Once enabled, they apply automatically to every supported route the app executes — transfers, swaps, and crypto deposit addresses. There is no request parameter to set and no change to existing integration code.

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How it works

Rather than deducting the routing cost from the transfer, Privy meters it and invoices your app at the end of the month. See usage and billing for how Privy invoices metered charges, and usage webhooks for observing each charge as Privy records it.

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Confirming the delivered amount

Use the quote endpoint and read estimated_output_amount. That field is the authoritative statement of what the recipient receives, on fixed-rate and standard routes alike.
On a fixed-rate route, amount_type: 'exact_input' already delivers an exact figure to the recipient, so exact_output is rarely needed. See amount types for the difference between the two.

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Limitations

Fixed rates cover the cost of routing a transfer between chains or between assets. Same-chain, same-asset transfers have no routing cost to cover. Gas sponsorship covers network gas separately.
Fixed rates are a property of the app, so an app cannot turn them on for some transfers and not others.
Fixed rates change how routing costs are paid, not which routes exist. Available liquidity and supported asset pairs are unchanged. See the bridging limitations for supported routes.

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Next steps

Usage and billing

Understand how Privy invoices metered usage at the end of the month.

Usage webhooks

Receive an event each time Privy records a charge.