Here's how to use rates in different in your payment process:

1. Indicative Rate API (Crypto Rate API)

This is an API endpoint designed to help you, the merchant, show real-time exchange rates to your customers before they pay or withdraw funds. This makes it easier for them to understand how much cryptocurrency (or fiat) they’re sending or receiving.

Rate for Payins

When your customer wants to deposit funds using cryptocurrency, you'll use the indicative rate to show them how much crypto (Currency) they need to send to match the amount you want to credit them in your cashierCurrency (the currency your platform uses internally).

Example:

Your cashierCurrency is GBP.
Your customer wants to pay with USDT.
You call /crypto/rate with ticker: USDT_GBP and the amount of USDT they plan to send (or calculate based on the GBP amount you want to receive).

The API returns the exchange rate and the equivalent GBP amount so you can show them:

"To pay £100 GBP, you need to send 135 USDT."

This helps the customer know exactly how much crypto to send so their account is credited with the right amount of cashier currency.

Rate for Payouts

When your customer wants to withdraw funds from your platform, you might offer to pay them in cryptocurrency (targetCurrency) even though your system balances or payouts are usually denominated in your cashierCurrency.

Example:

Your cashierCurrency is USD (you keep balances in USD).
The customer wants to receive their withdrawal in USDT (target currency).
You call /crypto/rate with ticker: USDT_USD and the USD amount you’re paying out.

The API returns the exchange rate and the equivalent USDT amount so you can show them:

"Your withdrawal of $500 USD equals 499.00 USDT."

This helps your customer know exactly how much crypto they’ll receive and lets them double-check that before you send it.

2. Transaction Rate in API Responses

When you initiate a Payin transaction, the API response will contain a rates array that shows the conversion that took place. This is different from the indicative rate you fetch using /crypto/rate. These are the actual rates applied to the transaction. Each entry in this array shows:

The currencies being converted
The exact amount converted
The precise exchange rate used

Example

"rates": [
  {
    "ticker": "GBP_USD",
    "amount": "1.00",
    "price": "1.35",
    "rate": "1.3468194858"
  }
]

Field	Description
ticker	The currency pair being converted
amount	Amount of cryptocurrency that the payer sends.
price	The equivalent amount in the `cashierCurrency` that is displayed on the merchant platform.
rate	The exact rate used in calculations