Application fees

Overview

An application fee is your markup on top of Due’s own fees, charged on every transfer. You configure it once per environment in the Portal Dashboard, and Portal applies it to every quote, transfer, and virtual account. Your clients see the fee in their quotes but cannot change it.

How enforcement works

Portal enforces fees server-side. On every quote, transfer, and virtual-account update, Portal strips any applicationFeeBps or applicationFeeAmount a client sends and injects the fee you configured. A client can include those fields in a request, but they are always ignored in favor of your configuration.

The fee is applied to a single side of each transfer (the side you choose), not to both sides.

Configure fees in the Portal Dashboard

Open the Portal Dashboard.
Navigate to the Integrations page and open your Due integration.
Under Application fees, set your fee:
- Fee: the percentage you add on top of Due’s fees.
- Flat fee: an optional fixed amount added per transfer.
- Charge on: whether the fee comes from the amount sent (Source) or the amount received (Destination).
- Different fees per direction: enable this to set separate fees for pay-ins (fiat to crypto) and pay-outs (crypto to fiat). Anything left blank inherits the default.
Save.

Portal Dashboard Due configuration modal showing the API key input and application fees panel

Fees are environment-scoped, like the API key. Configure them separately for each environment (for example Development and Production).

The fee model

Percentage and flat: set either or both. The percentage applies to the charged side’s amount; the flat fee is added on top.
Default and per-direction: the default fee applies to every transfer. Optional pay-in and pay-out overrides take precedence for their direction and fall back to the default when left blank. Direction is derived from the transfer: fiat to crypto is a pay-in, crypto to fiat is a pay-out. Virtual account deposits use the pay-in fee.
Charge on: Source takes the fee from the amount the customer sends; Destination takes it from the amount they receive.
Subsidies: a negative percentage subsidizes the customer instead of charging them. Due caps the subsidy at its own fee.

How fees appear to clients

Clients see the fee in the quote response, per side, alongside Due’s own fees. They cannot alter it.

{
  "data": {
    "token": "qte_abc",
    "source": { "rail": "ach", "currency": "USD", "amount": "100", "fee": "0.50", "applicationFee": "0.50", "totalFee": "1.00" },
    "destination": { "rail": "base-sepolia", "currency": "USDC", "amount": "99.00", "fee": "0", "totalFee": "0" }
  }
}

​Overview

​How enforcement works

​Configure fees in the Portal Dashboard

​The fee model

​How fees appear to clients

​Next steps

Overview

How enforcement works

Configure fees in the Portal Dashboard

The fee model

How fees appear to clients

Next steps