# Currency Rate Conversions ### Choose Your Units: Satoshis or USD While creating a payment intent, you have option to set the payment value in USD or Satoshi values. If you do not specify a unit, we use satoshi as a default unit. See our [API Reference](/for-developers/interactive-api-reference.md) page for more details. ### Currency Rates If you prefer to set payment values in USD terms, we use the most recent BTC/USD price for conversions. **Example**: You create a payment with the value of $0.99. Based on the most recent BTC/USD price we calculate the Bitcoin equivalent in satoshi units (1 BTC = 100,000,000 satoshis). This is to provide convenience for users who use USD as a unit of account. The actual payments are made in Satoshi terms. {% hint style="info" %} Currently we use Bitstamp as our ticker source. We use volume weighted average price (VWAP) to avoid momentarily price spikes. We periodically update price information every 10 minutes. If you have specific requirements about the currency rate calculations, please let us know. {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.phenixio.com/features/currency-rate-conversions.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.