# Retrieving Lists of Available Currencies and Invoice Parameters

#### GET /api/external/v1/gateway/payment-currency

This method allows you to retrieve lists of available currencies and their corresponding parameters that can be used for generating invoices through payment methods.

**Request:**

`GET /api/external/v1/gateway/payment-currency`

**Response:**

```json
{
   "success": true,
   "status": null,
   "response": {
       "ETH": {
           "name": "Ethereum",
           "ticker": "ETH",
           "type": "CRYPTO",
           "payment_method": {
               "ETHER": {
                   "key": "ETHER",
                   "name": "Ethereum",
                   "type": "Erc-20",
                   "deposit": {
                       "fee": {
                           "flex_percent": "1"
                       }
                   },
                   "withdrawal": {
                       "fee": {
                           "flex_percent": "1"
                       }
                   }
               }
           }
       },
       "USDT": {
           /* Data about Tether USD and other currencies */
       },
       /* Other currencies */
   },
   "errors": null
}
```

#### Retrieving Currency and Invoice Parameters by Ticker

**GET /api/external/v1/gateway/payment-currency/{ticker}**

This method allows you to retrieve information about a specific currency and its corresponding parameters that can be used for generating invoices through payment methods.

**Request:**

`GET /api/external/v1/gateway/payment-currency/{ticker}`

**Response:**

```json
{
   "success": true,
   "status": null,
   "response": {
       "name": "Tether USD",
       "ticker": "USDT",
       "type": "CRYPTO",
       "payment_method": {
           "ETHER": {
               "key": "ETHER",
               "name": "Tether USD",
               "type": "ERC-20",
               "deposit": {
                   "fee": {
                       "flex_percent": "1"
                   }
               },
               "withdrawal": {
                   "fee": {
                       "flex_percent": "1"
                   }
               }
           }
       }
   },
   "errors": null
}
```

These methods provide the capability to retrieve information about available currencies and their corresponding parameters for generating invoices. They can be used in various scenarios to configure payment methods and define parameters for invoices.


---

# 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://e-gates.gitbook.io/crypto-payments-ot-e-gates-eng/retrieving-lists-of-available-currencies-and-invoice-parameters.md?ask=<question>
```

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.